Upgrade protozero to 1.5.1 (e94728c)

protozero/byteswap.hpp

@@ -16,56 +16,69 @@ documentation.
  * @brief Contains functions to swap bytes in values (for different endianness).
  */
 
-#include <cstdint>
 #include <cassert>
+#include <cstdint>
 
 #include <protozero/config.hpp>
 
 namespace protozero {
+namespace detail {
 
-/**
- * Swap N byte value between endianness formats. This template function must
- * be specialized to actually work.
- */
-template <int N>
-inline void byteswap(const char* /*data*/, char* /*result*/) {
-    static_assert(N == 1, "Can only swap 4 or 8 byte values");
-}
-
-/**
- * Swap 4 byte value (int32_t, uint32_t, float) between endianness formats.
- */
-template <>
-inline void byteswap<4>(const char* data, char* result) {
+inline uint32_t byteswap_impl(uint32_t value) noexcept {
 #ifdef PROTOZERO_USE_BUILTIN_BSWAP
-    *reinterpret_cast<uint32_t*>(result) = __builtin_bswap32(*reinterpret_cast<const uint32_t*>(data));
+    return __builtin_bswap32(value);
 #else
-    result[3] = data[0];
-    result[2] = data[1];
-    result[1] = data[2];
-    result[0] = data[3];
+    return ((value & 0xff000000) >> 24) |
+           ((value & 0x00ff0000) >>  8) |
+           ((value & 0x0000ff00) <<  8) |
+           ((value & 0x000000ff) << 24);
 #endif
 }
 
-/**
- * Swap 8 byte value (int64_t, uint64_t, double) between endianness formats.
- */
-template <>
-inline void byteswap<8>(const char* data, char* result) {
+inline uint64_t byteswap_impl(uint64_t value) noexcept {
 #ifdef PROTOZERO_USE_BUILTIN_BSWAP
-    *reinterpret_cast<uint64_t*>(result) = __builtin_bswap64(*reinterpret_cast<const uint64_t*>(data));
+    return __builtin_bswap64(value);
 #else
-    result[7] = data[0];
-    result[6] = data[1];
-    result[5] = data[2];
-    result[4] = data[3];
-    result[3] = data[4];
-    result[2] = data[5];
-    result[1] = data[6];
-    result[0] = data[7];
+    return ((value & 0xff00000000000000ULL) >> 56) |
+           ((value & 0x00ff000000000000ULL) >> 40) |
+           ((value & 0x0000ff0000000000ULL) >> 24) |
+           ((value & 0x000000ff00000000ULL) >>  8) |
+           ((value & 0x00000000ff000000ULL) <<  8) |
+           ((value & 0x0000000000ff0000ULL) << 24) |
+           ((value & 0x000000000000ff00ULL) << 40) |
+           ((value & 0x00000000000000ffULL) << 56);
 #endif
 }
 
+inline void byteswap_inplace(uint32_t* ptr) noexcept {
+    *ptr = byteswap_impl(*ptr);
+}
+
+inline void byteswap_inplace(uint64_t* ptr) noexcept {
+    *ptr = byteswap_impl(*ptr);
+}
+
+inline void byteswap_inplace(int32_t* ptr) noexcept {
+    auto bptr = reinterpret_cast<uint32_t*>(ptr);
+    *bptr = byteswap_impl(*bptr);
+}
+
+inline void byteswap_inplace(int64_t* ptr) noexcept {
+    auto bptr = reinterpret_cast<uint64_t*>(ptr);
+    *bptr = byteswap_impl(*bptr);
+}
+
+inline void byteswap_inplace(float* ptr) noexcept {
+    auto bptr = reinterpret_cast<uint32_t*>(ptr);
+    *bptr = byteswap_impl(*bptr);
+}
+
+inline void byteswap_inplace(double* ptr) noexcept {
+    auto bptr = reinterpret_cast<uint64_t*>(ptr);
+    *bptr = byteswap_impl(*bptr);
+}
+
+} // end namespace detail
 } // end namespace protozero
 
 #endif // PROTOZERO_BYTESWAP_HPP

protozero/config.hpp

@@ -35,17 +35,6 @@ documentation.
 # define PROTOZERO_BYTE_ORDER PROTOZERO_LITTLE_ENDIAN
 #endif
 
-// On some ARM machines and depending on compiler settings access to unaligned
-// floating point values will result in a SIGBUS. Do not use the bare pointers
-// in this case.
-#if PROTOZERO_BYTE_ORDER == PROTOZERO_LITTLE_ENDIAN
-# if !defined(__arm__) && !defined(_M_ARM)
-#  ifndef PROTOZERO_DO_NOT_USE_BARE_POINTER
-#   define PROTOZERO_USE_BARE_POINTER_FOR_PACKED_FIXED
-#  endif
-# endif
-#endif
-
 // Check whether __builtin_bswap is available
 #if defined(__GNUC__) || defined(__clang__)
 # define PROTOZERO_USE_BUILTIN_BSWAP

protozero/exception.hpp

@@ -29,7 +29,7 @@ namespace protozero {
  */
 struct exception : std::exception {
     /// Returns the explanatory string.
-    const char *what() const noexcept override { return "pbf exception"; }
+    const char* what() const noexcept override { return "pbf exception"; }
 };
 
 /**
@@ -38,7 +38,7 @@ struct exception : std::exception {
  */
 struct varint_too_long_exception : exception {
     /// Returns the explanatory string.
-    const char *what() const noexcept override { return "varint too long exception"; }
+    const char* what() const noexcept override { return "varint too long exception"; }
 };
 
 /**
@@ -47,7 +47,7 @@ struct varint_too_long_exception : exception {
  */
 struct unknown_pbf_wire_type_exception : exception {
     /// Returns the explanatory string.
-    const char *what() const noexcept override { return "unknown pbf field type exception"; }
+    const char* what() const noexcept override { return "unknown pbf field type exception"; }
 };
 
 /**
@@ -60,7 +60,7 @@ struct unknown_pbf_wire_type_exception : exception {
  */
 struct end_of_buffer_exception : exception {
     /// Returns the explanatory string.
-    const char *what() const noexcept override { return "end of buffer exception"; }
+    const char* what() const noexcept override { return "end of buffer exception"; }
 };
 
 } // end namespace protozero

protozero/iterators.hpp

@@ -0,0 +1,328 @@
+#ifndef PROTOZERO_ITERATORS_HPP
+#define PROTOZERO_ITERATORS_HPP
+
+/*****************************************************************************
+
+protozero - Minimalistic protocol buffer decoder and encoder in C++.
+
+This file is from https://github.com/mapbox/protozero where you can find more
+documentation.
+
+*****************************************************************************/
+
+/**
+ * @file iterators.hpp
+ *
+ * @brief Contains the iterators for access to packed repeated fields.
+ */
+
+#include <cstring>
+#include <iterator>
+#include <utility>
+
+#include <protozero/config.hpp>
+#include <protozero/varint.hpp>
+
+#if PROTOZERO_BYTE_ORDER != PROTOZERO_LITTLE_ENDIAN
+# include <protozero/byteswap.hpp>
+#endif
+
+namespace protozero {
+
+/**
+ * A range of iterators based on std::pair. Created from beginning and
+ * end iterators. Used as a return type from some pbf_reader methods
+ * that is easy to use with range-based for loops.
+ */
+template <typename T, typename P = std::pair<T, T>>
+class iterator_range :
+#ifdef PROTOZERO_STRICT_API
+    protected
+#else
+    public
+#endif
+        P {
+
+public:
+
+    /// The type of the iterators in this range.
+    using iterator = T;
+
+    /// The value type of the underlying iterator.
+    using value_type = typename std::iterator_traits<T>::value_type;
+
+    /**
+     * Default constructor. Create empty iterator_range.
+     */
+    constexpr iterator_range() :
+        P(iterator{}, iterator{}) {
+    }
+
+    /**
+     * Create iterator range from two iterators.
+     *
+     * @param first_iterator Iterator to beginning or range.
+     * @param last_iterator Iterator to end or range.
+     */
+    constexpr iterator_range(iterator&& first_iterator, iterator&& last_iterator) :
+        P(std::forward<iterator>(first_iterator),
+          std::forward<iterator>(last_iterator)) {
+    }
+
+    /// Return iterator to beginning of range.
+    constexpr iterator begin() const noexcept {
+        return this->first;
+    }
+
+    /// Return iterator to end of range.
+    constexpr iterator end() const noexcept {
+        return this->second;
+    }
+
+    /// Return iterator to beginning of range.
+    constexpr iterator cbegin() const noexcept {
+        return this->first;
+    }
+
+    /// Return iterator to end of range.
+    constexpr iterator cend() const noexcept {
+        return this->second;
+    }
+
+    /// Return true if this range is empty.
+    constexpr std::size_t empty() const noexcept {
+        return begin() == end();
+    }
+
+    /**
+     * Get element at the beginning of the range.
+     *
+     * @pre Range must not be empty.
+     */
+    value_type front() const {
+        protozero_assert(!empty());
+        return *(this->first);
+    }
+
+    /**
+     * Advance beginning of range by one.
+     *
+     * @pre Range must not be empty.
+     */
+    void drop_front() {
+        protozero_assert(!empty());
+        ++this->first;
+    }
+
+    /**
+     * Swap the contents of this range with the other.
+     *
+     * @param other Other range to swap data with.
+     */
+    void swap(iterator_range& other) noexcept {
+        using std::swap;
+        swap(this->first, other.first);
+        swap(this->second, other.second);
+    }
+
+}; // struct iterator_range
+
+/**
+ * Swap two iterator_ranges.
+ *
+ * @param lhs First range.
+ * @param rhs Second range.
+ */
+template <typename T>
+inline void swap(iterator_range<T>& lhs, iterator_range<T>& rhs) noexcept {
+    lhs.swap(rhs);
+}
+
+/**
+ * A forward iterator used for accessing packed repeated fields of fixed
+ * length (fixed32, sfixed32, float, double).
+ */
+template <typename T>
+class const_fixed_iterator {
+
+    /// Pointer to current iterator position
+    const char* m_data;
+
+    /// Pointer to end iterator position
+    const char* m_end;
+
+public:
+
+    using iterator_category = std::forward_iterator_tag;
+    using value_type        = T;
+    using difference_type   = std::ptrdiff_t;
+    using pointer           = value_type*;
+    using reference         = value_type&;
+
+    const_fixed_iterator() noexcept :
+        m_data(nullptr),
+        m_end(nullptr) {
+    }
+
+    const_fixed_iterator(const char* data, const char* end) noexcept :
+        m_data(data),
+        m_end(end) {
+    }
+
+    const_fixed_iterator(const const_fixed_iterator&) noexcept = default;
+    const_fixed_iterator(const_fixed_iterator&&) noexcept = default;
+
+    const_fixed_iterator& operator=(const const_fixed_iterator&) noexcept = default;
+    const_fixed_iterator& operator=(const_fixed_iterator&&) noexcept = default;
+
+    ~const_fixed_iterator() noexcept = default;
+
+    value_type operator*() const {
+        value_type result;
+        std::memcpy(&result, m_data, sizeof(value_type));
+#if PROTOZERO_BYTE_ORDER != PROTOZERO_LITTLE_ENDIAN
+        detail::byteswap_inplace(&result);
+#endif
+        return result;
+    }
+
+    const_fixed_iterator& operator++() {
+        m_data += sizeof(value_type);
+        return *this;
+    }
+
+    const_fixed_iterator operator++(int) {
+        const const_fixed_iterator tmp(*this);
+        ++(*this);
+        return tmp;
+    }
+
+    bool operator==(const const_fixed_iterator& rhs) const noexcept {
+        return m_data == rhs.m_data && m_end == rhs.m_end;
+    }
+
+    bool operator!=(const const_fixed_iterator& rhs) const noexcept {
+        return !(*this == rhs);
+    }
+
+}; // class const_fixed_iterator
+
+/**
+ * A forward iterator used for accessing packed repeated varint fields
+ * (int32, uint32, int64, uint64, bool, enum).
+ */
+template <typename T>
+class const_varint_iterator {
+
+protected:
+
+    /// Pointer to current iterator position
+    const char* m_data;
+
+    /// Pointer to end iterator position
+    const char* m_end;
+
+public:
+
+    using iterator_category = std::forward_iterator_tag;
+    using value_type        = T;
+    using difference_type   = std::ptrdiff_t;
+    using pointer           = value_type*;
+    using reference         = value_type&;
+
+    const_varint_iterator() noexcept :
+        m_data(nullptr),
+        m_end(nullptr) {
+    }
+
+    const_varint_iterator(const char* data, const char* end) noexcept :
+        m_data(data),
+        m_end(end) {
+    }
+
+    const_varint_iterator(const const_varint_iterator&) noexcept = default;
+    const_varint_iterator(const_varint_iterator&&) noexcept = default;
+
+    const_varint_iterator& operator=(const const_varint_iterator&) noexcept = default;
+    const_varint_iterator& operator=(const_varint_iterator&&) noexcept = default;
+
+    ~const_varint_iterator() noexcept = default;
+
+    value_type operator*() const {
+        const char* d = m_data; // will be thrown away
+        return static_cast<value_type>(decode_varint(&d, m_end));
+    }
+
+    const_varint_iterator& operator++() {
+        skip_varint(&m_data, m_end);
+        return *this;
+    }
+
+    const_varint_iterator operator++(int) {
+        const const_varint_iterator tmp(*this);
+        ++(*this);
+        return tmp;
+    }
+
+    bool operator==(const const_varint_iterator& rhs) const noexcept {
+        return m_data == rhs.m_data && m_end == rhs.m_end;
+    }
+
+    bool operator!=(const const_varint_iterator& rhs) const noexcept {
+        return !(*this == rhs);
+    }
+
+}; // class const_varint_iterator
+
+/**
+ * A forward iterator used for accessing packed repeated svarint fields
+ * (sint32, sint64).
+ */
+template <typename T>
+class const_svarint_iterator : public const_varint_iterator<T> {
+
+public:
+
+    using iterator_category = std::forward_iterator_tag;
+    using value_type        = T;
+    using difference_type   = std::ptrdiff_t;
+    using pointer           = value_type*;
+    using reference         = value_type&;
+
+    const_svarint_iterator() noexcept :
+        const_varint_iterator<T>() {
+    }
+
+    const_svarint_iterator(const char* data, const char* end) noexcept :
+        const_varint_iterator<T>(data, end) {
+    }
+
+    const_svarint_iterator(const const_svarint_iterator&) = default;
+    const_svarint_iterator(const_svarint_iterator&&) = default;
+
+    const_svarint_iterator& operator=(const const_svarint_iterator&) = default;
+    const_svarint_iterator& operator=(const_svarint_iterator&&) = default;
+
+    ~const_svarint_iterator() = default;
+
+    value_type operator*() const {
+        const char* d = this->m_data; // will be thrown away
+        return static_cast<value_type>(decode_zigzag64(decode_varint(&d, this->m_end)));
+    }
+
+    const_svarint_iterator& operator++() {
+        skip_varint(&this->m_data, this->m_end);
+        return *this;
+    }
+
+    const_svarint_iterator operator++(int) {
+        const const_svarint_iterator tmp(*this);
+        ++(*this);
+        return tmp;
+    }
+
+}; // class const_svarint_iterator
+
+} // end namespace protozero
+
+#endif // PROTOZERO_ITERATORS_HPP

protozero/pbf_builder.hpp

@@ -18,8 +18,8 @@ documentation.
 
 #include <type_traits>
 
-#include <protozero/types.hpp>
 #include <protozero/pbf_writer.hpp>
+#include <protozero/types.hpp>
 
 namespace protozero {
 
@@ -57,7 +57,7 @@ public:
 
 /// @cond INTERNAL
 #define PROTOZERO_WRITER_WRAP_ADD_SCALAR(name, type) \
-    inline void add_##name(T tag, type value) { \
+    void add_##name(T tag, type value) { \
         pbf_writer::add_##name(pbf_tag_type(tag), value); \
     }
 
@@ -79,38 +79,43 @@ public:
 #undef PROTOZERO_WRITER_WRAP_ADD_SCALAR
 /// @endcond
 
-    inline void add_bytes(T tag, const char* value, std::size_t size) {
+    void add_bytes(T tag, const char* value, std::size_t size) {
         pbf_writer::add_bytes(pbf_tag_type(tag), value, size);
     }
 
-    inline void add_bytes(T tag, const std::string& value) {
+    void add_bytes(T tag, const std::string& value) {
         pbf_writer::add_bytes(pbf_tag_type(tag), value);
     }
 
-    inline void add_string(T tag, const char* value, std::size_t size) {
+    template <typename... Ts>
+    void add_bytes_vectored(T tag, Ts&&... values) {
+        pbf_writer::add_bytes_vectored(pbf_tag_type(tag), std::forward<Ts>(values)...);
+    }
+
+    void add_string(T tag, const char* value, std::size_t size) {
         pbf_writer::add_string(pbf_tag_type(tag), value, size);
     }
 
-    inline void add_string(T tag, const std::string& value) {
+    void add_string(T tag, const std::string& value) {
         pbf_writer::add_string(pbf_tag_type(tag), value);
     }
 
-    inline void add_string(T tag, const char* value) {
+    void add_string(T tag, const char* value) {
         pbf_writer::add_string(pbf_tag_type(tag), value);
     }
 
-    inline void add_message(T tag, const char* value, std::size_t size) {
+    void add_message(T tag, const char* value, std::size_t size) {
         pbf_writer::add_message(pbf_tag_type(tag), value, size);
     }
 
-    inline void add_message(T tag, const std::string& value) {
+    void add_message(T tag, const std::string& value) {
         pbf_writer::add_message(pbf_tag_type(tag), value);
     }
 
 /// @cond INTERNAL
 #define PROTOZERO_WRITER_WRAP_ADD_PACKED(name) \
     template <typename InputIterator> \
-    inline void add_packed_##name(T tag, InputIterator first, InputIterator last) { \
+    void add_packed_##name(T tag, InputIterator first, InputIterator last) { \
         pbf_writer::add_packed_##name(pbf_tag_type(tag), first, last); \
     }
 
@@ -132,7 +137,7 @@ public:
 #undef PROTOZERO_WRITER_WRAP_ADD_PACKED
 /// @endcond
 
-};
+}; // class pbf_builder
 
 } // end namespace protozero
 

protozero/pbf_message.hpp

@@ -13,7 +13,7 @@ documentation.
 /**
  * @file pbf_message.hpp
  *
- * @brief Contains the pbf_message class.
+ * @brief Contains the pbf_message template class.
  */
 
 #include <type_traits>
@@ -75,19 +75,19 @@ public:
         pbf_reader(std::forward<Args>(args)...) {
     }
 
-    inline bool next() {
+    bool next() {
         return pbf_reader::next();
     }
 
-    inline bool next(T tag) {
-        return pbf_reader::next(pbf_tag_type(tag));
+    bool next(T next_tag) {
+        return pbf_reader::next(pbf_tag_type(next_tag));
     }
 
-    inline T tag() const noexcept {
+    T tag() const noexcept {
         return T(pbf_reader::tag());
     }
 
-};
+}; // class pbf_message
 
 } // end namespace protozero
 

protozero/pbf_writer.hpp

@@ -22,6 +22,7 @@ documentation.
 #include <iterator>
 #include <limits>
 #include <string>
+#include <utility>
 
 #include <protozero/config.hpp>
 #include <protozero/types.hpp>
@@ -68,38 +69,35 @@ class pbf_writer {
     // parent to the position where the data of the submessage is written to.
     std::size_t m_pos = 0;
 
-    inline void add_varint(uint64_t value) {
+    void add_varint(uint64_t value) {
         protozero_assert(m_pos == 0 && "you can't add fields to a parent pbf_writer if there is an existing pbf_writer for a submessage");
         protozero_assert(m_data);
         write_varint(std::back_inserter(*m_data), value);
     }
 
-    inline void add_field(pbf_tag_type tag, pbf_wire_type type) {
+    void add_field(pbf_tag_type tag, pbf_wire_type type) {
         protozero_assert(((tag > 0 && tag < 19000) || (tag > 19999 && tag <= ((1 << 29) - 1))) && "tag out of range");
-        uint32_t b = (tag << 3) | uint32_t(type);
+        const uint32_t b = (tag << 3) | uint32_t(type);
         add_varint(b);
     }
 
-    inline void add_tagged_varint(pbf_tag_type tag, uint64_t value) {
+    void add_tagged_varint(pbf_tag_type tag, uint64_t value) {
         add_field(tag, pbf_wire_type::varint);
         add_varint(value);
     }
 
     template <typename T>
-    inline void add_fixed(T value) {
+    void add_fixed(T value) {
         protozero_assert(m_pos == 0 && "you can't add fields to a parent pbf_writer if there is an existing pbf_writer for a submessage");
         protozero_assert(m_data);
-#if PROTOZERO_BYTE_ORDER == PROTOZERO_LITTLE_ENDIAN
-        m_data->append(reinterpret_cast<const char*>(&value), sizeof(T));
-#else
-        auto size = m_data->size();
-        m_data->resize(size + sizeof(T));
-        byteswap<sizeof(T)>(reinterpret_cast<const char*>(&value), const_cast<char*>(m_data->data() + size));
+#if PROTOZERO_BYTE_ORDER != PROTOZERO_LITTLE_ENDIAN
+        detail::byteswap_inplace(&value);
 #endif
+        m_data->append(reinterpret_cast<const char*>(&value), sizeof(T));
     }
 
     template <typename T, typename It>
-    inline void add_packed_fixed(pbf_tag_type tag, It first, It last, std::input_iterator_tag) {
+    void add_packed_fixed(pbf_tag_type tag, It first, It last, std::input_iterator_tag) {
         if (first == last) {
             return;
         }
@@ -112,12 +110,12 @@ class pbf_writer {
     }
 
     template <typename T, typename It>
-    inline void add_packed_fixed(pbf_tag_type tag, It first, It last, std::forward_iterator_tag) {
+    void add_packed_fixed(pbf_tag_type tag, It first, It last, std::forward_iterator_tag) {
         if (first == last) {
             return;
         }
 
-        auto length = std::distance(first, last);
+        const auto length = std::distance(first, last);
         add_length_varint(tag, sizeof(T) * pbf_length_type(length));
         reserve(sizeof(T) * std::size_t(length));
 
@@ -127,7 +125,7 @@ class pbf_writer {
     }
 
     template <typename It>
-    inline void add_packed_varint(pbf_tag_type tag, It first, It last) {
+    void add_packed_varint(pbf_tag_type tag, It first, It last) {
         if (first == last) {
             return;
         }
@@ -140,7 +138,7 @@ class pbf_writer {
     }
 
     template <typename It>
-    inline void add_packed_svarint(pbf_tag_type tag, It first, It last) {
+    void add_packed_svarint(pbf_tag_type tag, It first, It last) {
         if (first == last) {
             return;
         }
@@ -155,14 +153,18 @@ class pbf_writer {
     // The number of bytes to reserve for the varint holding the length of
     // a length-delimited field. The length has to fit into pbf_length_type,
     // and a varint needs 8 bit for every 7 bit.
-    static const int reserve_bytes = sizeof(pbf_length_type) * 8 / 7 + 1;
+    enum constant_reserve_bytes : int {
+        reserve_bytes = sizeof(pbf_length_type) * 8 / 7 + 1
+    };
 
     // If m_rollpack_pos is set to this special value, it means that when
     // the submessage is closed, nothing needs to be done, because the length
     // of the submessage has already been written correctly.
-    static const std::size_t size_is_known = std::numeric_limits<std::size_t>::max();
+    enum constant_size_is_known : std::size_t {
+        size_is_known = std::numeric_limits<std::size_t>::max()
+    };
 
-    inline void open_submessage(pbf_tag_type tag, std::size_t size) {
+    void open_submessage(pbf_tag_type tag, std::size_t size) {
         protozero_assert(m_pos == 0);
         protozero_assert(m_data);
         if (size == 0) {
@@ -177,7 +179,7 @@ class pbf_writer {
         m_pos = m_data->size();
     }
 
-    inline void rollback_submessage() {
+    void rollback_submessage() {
         protozero_assert(m_pos != 0);
         protozero_assert(m_rollback_pos != size_is_known);
         protozero_assert(m_data);
@@ -185,20 +187,20 @@ class pbf_writer {
         m_pos = 0;
     }
 
-    inline void commit_submessage() {
+    void commit_submessage() {
         protozero_assert(m_pos != 0);
         protozero_assert(m_rollback_pos != size_is_known);
         protozero_assert(m_data);
-        auto length = pbf_length_type(m_data->size() - m_pos);
+        const auto length = pbf_length_type(m_data->size() - m_pos);
 
         protozero_assert(m_data->size() >= m_pos - reserve_bytes);
-        auto n = write_varint(m_data->begin() + long(m_pos) - reserve_bytes, length);
+        const auto n = write_varint(m_data->begin() + long(m_pos) - reserve_bytes, length);
 
         m_data->erase(m_data->begin() + long(m_pos) - reserve_bytes + n, m_data->begin() + long(m_pos));
         m_pos = 0;
     }
 
-    inline void close_submessage() {
+    void close_submessage() {
         protozero_assert(m_data);
         if (m_pos == 0 || m_rollback_pos == size_is_known) {
             return;
@@ -210,7 +212,7 @@ class pbf_writer {
         }
     }
 
-    inline void add_length_varint(pbf_tag_type tag, pbf_length_type length) {
+    void add_length_varint(pbf_tag_type tag, pbf_length_type length) {
         add_field(tag, pbf_wire_type::length_delimited);
         add_varint(length);
     }
@@ -222,20 +224,18 @@ public:
      * stores a reference to that string and adds all data to it. The string
      * doesn't have to be empty. The pbf_writer will just append data.
      */
-    inline explicit pbf_writer(std::string& data) noexcept :
+    explicit pbf_writer(std::string& data) noexcept :
         m_data(&data),
-        m_parent_writer(nullptr),
-        m_pos(0) {
+        m_parent_writer(nullptr) {
     }
 
     /**
      * Create a writer without a data store. In this form the writer can not
      * be used!
      */
-    inline pbf_writer() noexcept :
+    pbf_writer() noexcept :
         m_data(nullptr),
-        m_parent_writer(nullptr),
-        m_pos(0) {
+        m_parent_writer(nullptr) {
     }
 
     /**
@@ -248,10 +248,9 @@ public:
      *        Setting this allows some optimizations but is only possible in
      *        a few very specific cases.
      */
-    inline pbf_writer(pbf_writer& parent_writer, pbf_tag_type tag, std::size_t size=0) :
+    pbf_writer(pbf_writer& parent_writer, pbf_tag_type tag, std::size_t size=0) :
         m_data(parent_writer.m_data),
-        m_parent_writer(&parent_writer),
-        m_pos(0) {
+        m_parent_writer(&parent_writer) {
         m_parent_writer->open_submessage(tag, size);
     }
 
@@ -262,17 +261,30 @@ public:
     pbf_writer& operator=(const pbf_writer&) noexcept = default;
 
     /// A pbf_writer object can be moved
-    inline pbf_writer(pbf_writer&&) noexcept = default;
+    pbf_writer(pbf_writer&&) noexcept = default;
 
     /// A pbf_writer object can be moved
-    inline pbf_writer& operator=(pbf_writer&&) noexcept = default;
+    pbf_writer& operator=(pbf_writer&&) noexcept = default;
 
-    inline ~pbf_writer() {
+    ~pbf_writer() {
         if (m_parent_writer) {
             m_parent_writer->close_submessage();
         }
     }
 
+    /**
+     * Swap the contents of this object with the other.
+     *
+     * @param other Other object to swap data with.
+     */
+    void swap(pbf_writer& other) noexcept {
+        using std::swap;
+        swap(m_data, other.m_data);
+        swap(m_parent_writer, other.m_parent_writer);
+        swap(m_rollback_pos, other.m_rollback_pos);
+        swap(m_pos, other.m_pos);
+    }
+
     /**
      * Reserve size bytes in the underlying message store in addition to
      * whatever the message store already holds. So unlike
@@ -286,7 +298,14 @@ public:
         m_data->reserve(m_data->size() + size);
     }
 
-    inline void rollback() {
+    /**
+     * Cancel writing of this submessage. The complete submessage will be
+     * removed as if it was never created and no fields were added.
+     *
+     * @pre Must be a pbf_writer of a submessage, ie one opened with the
+     *      pbf_writer constructor taking a parent message.
+     */
+    void rollback() {
         protozero_assert(m_parent_writer && "you can't call rollback() on a pbf_writer without a parent");
         protozero_assert(m_pos == 0 && "you can't call rollback() on a pbf_writer that has an open nested submessage");
         m_parent_writer->rollback_submessage();
@@ -304,7 +323,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_bool(pbf_tag_type tag, bool value) {
+    void add_bool(pbf_tag_type tag, bool value) {
         add_field(tag, pbf_wire_type::varint);
         protozero_assert(m_pos == 0 && "you can't add fields to a parent pbf_writer if there is an existing pbf_writer for a submessage");
         protozero_assert(m_data);
@@ -317,7 +336,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_enum(pbf_tag_type tag, int32_t value) {
+    void add_enum(pbf_tag_type tag, int32_t value) {
         add_tagged_varint(tag, uint64_t(value));
     }
 
@@ -327,7 +346,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_int32(pbf_tag_type tag, int32_t value) {
+    void add_int32(pbf_tag_type tag, int32_t value) {
         add_tagged_varint(tag, uint64_t(value));
     }
 
@@ -337,7 +356,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_sint32(pbf_tag_type tag, int32_t value) {
+    void add_sint32(pbf_tag_type tag, int32_t value) {
         add_tagged_varint(tag, encode_zigzag32(value));
     }
 
@@ -347,7 +366,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_uint32(pbf_tag_type tag, uint32_t value) {
+    void add_uint32(pbf_tag_type tag, uint32_t value) {
         add_tagged_varint(tag, value);
     }
 
@@ -357,7 +376,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_int64(pbf_tag_type tag, int64_t value) {
+    void add_int64(pbf_tag_type tag, int64_t value) {
         add_tagged_varint(tag, uint64_t(value));
     }
 
@@ -367,7 +386,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_sint64(pbf_tag_type tag, int64_t value) {
+    void add_sint64(pbf_tag_type tag, int64_t value) {
         add_tagged_varint(tag, encode_zigzag64(value));
     }
 
@@ -377,7 +396,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_uint64(pbf_tag_type tag, uint64_t value) {
+    void add_uint64(pbf_tag_type tag, uint64_t value) {
         add_tagged_varint(tag, value);
     }
 
@@ -387,7 +406,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_fixed32(pbf_tag_type tag, uint32_t value) {
+    void add_fixed32(pbf_tag_type tag, uint32_t value) {
         add_field(tag, pbf_wire_type::fixed32);
         add_fixed<uint32_t>(value);
     }
@@ -398,7 +417,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_sfixed32(pbf_tag_type tag, int32_t value) {
+    void add_sfixed32(pbf_tag_type tag, int32_t value) {
         add_field(tag, pbf_wire_type::fixed32);
         add_fixed<int32_t>(value);
     }
@@ -409,7 +428,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_fixed64(pbf_tag_type tag, uint64_t value) {
+    void add_fixed64(pbf_tag_type tag, uint64_t value) {
         add_field(tag, pbf_wire_type::fixed64);
         add_fixed<uint64_t>(value);
     }
@@ -420,7 +439,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_sfixed64(pbf_tag_type tag, int64_t value) {
+    void add_sfixed64(pbf_tag_type tag, int64_t value) {
         add_field(tag, pbf_wire_type::fixed64);
         add_fixed<int64_t>(value);
     }
@@ -431,7 +450,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_float(pbf_tag_type tag, float value) {
+    void add_float(pbf_tag_type tag, float value) {
         add_field(tag, pbf_wire_type::fixed32);
         add_fixed<float>(value);
     }
@@ -442,7 +461,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_double(pbf_tag_type tag, double value) {
+    void add_double(pbf_tag_type tag, double value) {
         add_field(tag, pbf_wire_type::fixed64);
         add_fixed<double>(value);
     }
@@ -454,7 +473,7 @@ public:
      * @param value Pointer to value to be written
      * @param size Number of bytes to be written
      */
-    inline void add_bytes(pbf_tag_type tag, const char* value, std::size_t size) {
+    void add_bytes(pbf_tag_type tag, const char* value, std::size_t size) {
         protozero_assert(m_pos == 0 && "you can't add fields to a parent pbf_writer if there is an existing pbf_writer for a submessage");
         protozero_assert(m_data);
         protozero_assert(size <= std::numeric_limits<pbf_length_type>::max());
@@ -468,10 +487,51 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_bytes(pbf_tag_type tag, const std::string& value) {
+    void add_bytes(pbf_tag_type tag, const data_view& value) {
         add_bytes(tag, value.data(), value.size());
     }
 
+    /**
+     * Add "bytes" field to data.
+     *
+     * @param tag Tag (field number) of the field
+     * @param value Value to be written
+     */
+    void add_bytes(pbf_tag_type tag, const std::string& value) {
+        add_bytes(tag, value.data(), value.size());
+    }
+
+    /**
+     * Add "bytes" field to data using vectored input. All the data in the
+     * 2nd and further arguments is "concatenated" with only a single copy
+     * into the final buffer.
+     *
+     * This will work with objects of any type supporting the data() and
+     * size() methods like std::string or protozero::data_view.
+     *
+     * Example:
+     * @code
+     * std::string data1 = "abc";
+     * std::string data2 = "xyz";
+     * writer.add_bytes_vectored(1, data1, data2);
+     * @endcode
+     *
+     * @tparam Ts List of types supporting data() and size() methods.
+     * @param tag Tag (field number) of the field
+     * @param values List of objects of types Ts with data to be appended.
+     */
+    template <typename... Ts>
+    void add_bytes_vectored(pbf_tag_type tag, Ts&&... values) {
+        protozero_assert(m_pos == 0 && "you can't add fields to a parent pbf_writer if there is an existing pbf_writer for a submessage");
+        protozero_assert(m_data);
+        size_t sum_size = 0;
+        (void)std::initializer_list<size_t>{sum_size += values.size()...};
+        protozero_assert(sum_size <= std::numeric_limits<pbf_length_type>::max());
+        add_length_varint(tag, pbf_length_type(sum_size));
+        m_data->reserve(m_data->size() + sum_size);
+        (void)std::initializer_list<int>{(m_data->append(values.data(), values.size()), 0)...};
+    }
+
     /**
      * Add "string" field to data.
      *
@@ -479,7 +539,7 @@ public:
      * @param value Pointer to value to be written
      * @param size Number of bytes to be written
      */
-    inline void add_string(pbf_tag_type tag, const char* value, std::size_t size) {
+    void add_string(pbf_tag_type tag, const char* value, std::size_t size) {
         add_bytes(tag, value, size);
     }
 
@@ -489,7 +549,17 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written
      */
-    inline void add_string(pbf_tag_type tag, const std::string& value) {
+    void add_string(pbf_tag_type tag, const data_view& value) {
+        add_bytes(tag, value.data(), value.size());
+    }
+
+    /**
+     * Add "string" field to data.
+     *
+     * @param tag Tag (field number) of the field
+     * @param value Value to be written
+     */
+    void add_string(pbf_tag_type tag, const std::string& value) {
         add_bytes(tag, value.data(), value.size());
     }
 
@@ -500,7 +570,7 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Pointer to value to be written
      */
-    inline void add_string(pbf_tag_type tag, const char* value) {
+    void add_string(pbf_tag_type tag, const char* value) {
         add_bytes(tag, value, std::strlen(value));
     }
 
@@ -511,7 +581,7 @@ public:
      * @param value Pointer to message to be written
      * @param size Length of the message
      */
-    inline void add_message(pbf_tag_type tag, const char* value, std::size_t size) {
+    void add_message(pbf_tag_type tag, const char* value, std::size_t size) {
         add_bytes(tag, value, size);
     }
 
@@ -521,7 +591,17 @@ public:
      * @param tag Tag (field number) of the field
      * @param value Value to be written. The value must be a complete message.
      */
-    inline void add_message(pbf_tag_type tag, const std::string& value) {
+    void add_message(pbf_tag_type tag, const data_view& value) {
+        add_bytes(tag, value.data(), value.size());
+    }
+
+    /**
+     * Add "message" field to data.
+     *
+     * @param tag Tag (field number) of the field
+     * @param value Value to be written. The value must be a complete message.
+     */
+    void add_message(pbf_tag_type tag, const std::string& value) {
         add_bytes(tag, value.data(), value.size());
     }
 
@@ -535,126 +615,126 @@ public:
     /**
      * Add "repeated packed bool" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to bool.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_bool(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_bool(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed enum" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_enum(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_enum(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed int32" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_int32(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_int32(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed sint32" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_sint32(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_sint32(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_svarint(tag, first, last);
     }
 
     /**
      * Add "repeated packed uint32" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to uint32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_uint32(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_uint32(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed int64" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int64_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_int64(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_int64(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed sint64" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int64_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_sint64(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_sint64(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_svarint(tag, first, last);
     }
 
     /**
      * Add "repeated packed uint64" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to uint64_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_uint64(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_uint64(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_varint(tag, first, last);
     }
 
     /**
      * Add "repeated packed fixed32" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to uint32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_fixed32(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_fixed32(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<uint32_t, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -662,14 +742,14 @@ public:
     /**
      * Add "repeated packed sfixed32" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int32_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_sfixed32(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_sfixed32(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<int32_t, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -677,14 +757,14 @@ public:
     /**
      * Add "repeated packed fixed64" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to uint64_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_fixed64(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_fixed64(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<uint64_t, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -692,14 +772,14 @@ public:
     /**
      * Add "repeated packed sfixed64" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to int64_t.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_sfixed64(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_sfixed64(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<int64_t, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -707,14 +787,14 @@ public:
     /**
      * Add "repeated packed float" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to float.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_float(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_float(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<float, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -722,14 +802,14 @@ public:
     /**
      * Add "repeated packed double" field to data.
      *
-     * @tparam InputIterator An type satisfying the InputIterator concept.
+     * @tparam InputIterator A type satisfying the InputIterator concept.
      *         Dereferencing the iterator must yield a type assignable to double.
      * @param tag Tag (field number) of the field
      * @param first Iterator pointing to the beginning of the data
      * @param last Iterator pointing one past the end of data
      */
     template <typename InputIterator>
-    inline void add_packed_double(pbf_tag_type tag, InputIterator first, InputIterator last) {
+    void add_packed_double(pbf_tag_type tag, InputIterator first, InputIterator last) {
         add_packed_fixed<double, InputIterator>(tag, first, last,
             typename std::iterator_traits<InputIterator>::iterator_category());
     }
@@ -742,6 +822,16 @@ public:
 
 }; // class pbf_writer
 
+/**
+ * Swap two pbf_writer objects.
+ *
+ * @param lhs First object.
+ * @param rhs Second object.
+ */
+inline void swap(pbf_writer& lhs, pbf_writer& rhs) noexcept {
+    lhs.swap(rhs);
+}
+
 namespace detail {
 
     class packed_field {
@@ -752,6 +842,12 @@ namespace detail {
 
     public:
 
+        packed_field(const packed_field&) = delete;
+        packed_field& operator=(const packed_field&) = delete;
+
+        packed_field(packed_field&&) = default;
+        packed_field& operator=(packed_field&&) = default;
+
         packed_field(pbf_writer& parent_writer, pbf_tag_type tag) :
             m_writer(parent_writer, tag) {
         }
@@ -771,12 +867,14 @@ namespace detail {
 
     public:
 
-        packed_field_fixed(pbf_writer& parent_writer, pbf_tag_type tag) :
-            packed_field(parent_writer, tag) {
+        template <typename P>
+        packed_field_fixed(pbf_writer& parent_writer, P tag) :
+            packed_field(parent_writer, static_cast<pbf_tag_type>(tag)) {
         }
 
-        packed_field_fixed(pbf_writer& parent_writer, pbf_tag_type tag, std::size_t size) :
-            packed_field(parent_writer, tag, size * sizeof(T)) {
+        template <typename P>
+        packed_field_fixed(pbf_writer& parent_writer, P tag, std::size_t size) :
+            packed_field(parent_writer, static_cast<pbf_tag_type>(tag), size * sizeof(T)) {
         }
 
         void add_element(T value) {
@@ -790,8 +888,9 @@ namespace detail {
 
     public:
 
-        packed_field_varint(pbf_writer& parent_writer, pbf_tag_type tag) :
-            packed_field(parent_writer, tag) {
+        template <typename P>
+        packed_field_varint(pbf_writer& parent_writer, P tag) :
+            packed_field(parent_writer, static_cast<pbf_tag_type>(tag)) {
         }
 
         void add_element(T value) {
@@ -805,8 +904,9 @@ namespace detail {
 
     public:
 
-        packed_field_svarint(pbf_writer& parent_writer, pbf_tag_type tag) :
-            packed_field(parent_writer, tag) {
+        template <typename P>
+        packed_field_svarint(pbf_writer& parent_writer, P tag) :
+            packed_field(parent_writer, static_cast<pbf_tag_type>(tag)) {
         }
 
         void add_element(T value) {
@@ -817,19 +917,46 @@ namespace detail {
 
 } // end namespace detail
 
+/// Class for generating packed repeated bool fields.
 using packed_field_bool     = detail::packed_field_varint<bool>;
+
+/// Class for generating packed repeated enum fields.
 using packed_field_enum     = detail::packed_field_varint<int32_t>;
+
+/// Class for generating packed repeated int32 fields.
 using packed_field_int32    = detail::packed_field_varint<int32_t>;
+
+/// Class for generating packed repeated sint32 fields.
 using packed_field_sint32   = detail::packed_field_svarint<int32_t>;
+
+/// Class for generating packed repeated uint32 fields.
 using packed_field_uint32   = detail::packed_field_varint<uint32_t>;
+
+/// Class for generating packed repeated int64 fields.
 using packed_field_int64    = detail::packed_field_varint<int64_t>;
+
+/// Class for generating packed repeated sint64 fields.
 using packed_field_sint64   = detail::packed_field_svarint<int64_t>;
+
+/// Class for generating packed repeated uint64 fields.
 using packed_field_uint64   = detail::packed_field_varint<uint64_t>;
+
+/// Class for generating packed repeated fixed32 fields.
 using packed_field_fixed32  = detail::packed_field_fixed<uint32_t>;
+
+/// Class for generating packed repeated sfixed32 fields.
 using packed_field_sfixed32 = detail::packed_field_fixed<int32_t>;
+
+/// Class for generating packed repeated fixed64 fields.
 using packed_field_fixed64  = detail::packed_field_fixed<uint64_t>;
+
+/// Class for generating packed repeated sfixed64 fields.
 using packed_field_sfixed64 = detail::packed_field_fixed<int64_t>;
+
+/// Class for generating packed repeated float fields.
 using packed_field_float    = detail::packed_field_fixed<float>;
+
+/// Class for generating packed repeated double fields.
 using packed_field_double   = detail::packed_field_fixed<double>;
 
 } // end namespace protozero

protozero/types.hpp

@@ -16,33 +16,184 @@ documentation.
  * @brief Contains the declaration of low-level types used in the pbf format.
  */
 
+#include <cstddef>
 #include <cstdint>
+#include <cstring>
+#include <string>
+#include <utility>
+
+#include <protozero/config.hpp>
 
 namespace protozero {
 
-    /**
-     * The type used for field tags (field numbers).
-     */
-    typedef uint32_t pbf_tag_type;
+/**
+ * The type used for field tags (field numbers).
+ */
+using pbf_tag_type = uint32_t;
+
+/**
+ * The type used to encode type information.
+ * See the table on
+ *    https://developers.google.com/protocol-buffers/docs/encoding
+ */
+enum class pbf_wire_type : uint32_t {
+    varint           = 0, // int32/64, uint32/64, sint32/64, bool, enum
+    fixed64          = 1, // fixed64, sfixed64, double
+    length_delimited = 2, // string, bytes, embedded messages,
+                            // packed repeated fields
+    fixed32          = 5, // fixed32, sfixed32, float
+    unknown          = 99 // used for default setting in this library
+};
+
+/**
+ * Get the tag and wire type of the current field in one integer suitable
+ * for comparison with a switch statement.
+ *
+ * See pbf_reader.tag_and_type() for an example how to use this.
+ */
+template <typename T>
+constexpr inline uint32_t tag_and_type(T tag, pbf_wire_type wire_type) noexcept {
+    return (static_cast<uint32_t>(static_cast<pbf_tag_type>(tag)) << 3) | static_cast<uint32_t>(wire_type);
+}
+
+/**
+ * The type used for length values, such as the length of a field.
+ */
+using pbf_length_type = uint32_t;
+
+#ifdef PROTOZERO_USE_VIEW
+using data_view = PROTOZERO_USE_VIEW;
+#else
+
+/**
+ * Holds a pointer to some data and a length.
+ *
+ * This class is supposed to be compatible with the std::string_view
+ * that will be available in C++17.
+ */
+class data_view {
+
+    const char* m_data;
+    std::size_t m_size;
+
+public:
 
     /**
-     * The type used to encode type information.
-     * See the table on
-     *    https://developers.google.com/protocol-buffers/docs/encoding
+     * Default constructor. Construct an empty data_view.
      */
-    enum class pbf_wire_type : uint32_t {
-        varint           = 0, // int32/64, uint32/64, sint32/64, bool, enum
-        fixed64          = 1, // fixed64, sfixed64, double
-        length_delimited = 2, // string, bytes, embedded messages,
-                              // packed repeated fields
-        fixed32          = 5, // fixed32, sfixed32, float
-        unknown          = 99 // used for default setting in this library
-    };
+    constexpr data_view() noexcept
+        : m_data(nullptr),
+          m_size(0) {
+    }
 
     /**
-     * The type used for length values, such as the length of a field.
+     * Create data_view from pointer and size.
+     *
+     * @param ptr Pointer to the data.
+     * @param length Length of the data.
      */
-    typedef uint32_t pbf_length_type;
+    constexpr data_view(const char* ptr, std::size_t length) noexcept
+        : m_data(ptr),
+          m_size(length) {
+    }
+
+    /**
+     * Create data_view from string.
+     *
+     * @param str String with the data.
+     */
+    data_view(const std::string& str) noexcept
+        : m_data(str.data()),
+          m_size(str.size()) {
+    }
+
+    /**
+     * Create data_view from zero-terminated string.
+     *
+     * @param ptr Pointer to the data.
+     */
+    data_view(const char* ptr) noexcept
+        : m_data(ptr),
+          m_size(std::strlen(ptr)) {
+    }
+
+    /**
+     * Swap the contents of this object with the other.
+     *
+     * @param other Other object to swap data with.
+     */
+    void swap(data_view& other) noexcept {
+        using std::swap;
+        swap(m_data, other.m_data);
+        swap(m_size, other.m_size);
+    }
+
+    /// Return pointer to data.
+    constexpr const char* data() const noexcept {
+        return m_data;
+    }
+
+    /// Return length of data in bytes.
+    constexpr std::size_t size() const noexcept {
+        return m_size;
+    }
+
+    /**
+     * Convert data view to string.
+     *
+     * @pre Must not be default constructed data_view.
+     */
+    std::string to_string() const {
+        protozero_assert(m_data);
+        return std::string{m_data, m_size};
+    }
+
+    /**
+     * Convert data view to string.
+     *
+     * @pre Must not be default constructed data_view.
+     */
+    explicit operator std::string() const {
+        protozero_assert(m_data);
+        return std::string{m_data, m_size};
+    }
+
+}; // class data_view
+
+/**
+ * Swap two data_view objects.
+ *
+ * @param lhs First object.
+ * @param rhs Second object.
+ */
+inline void swap(data_view& lhs, data_view& rhs) noexcept {
+    lhs.swap(rhs);
+}
+
+/**
+ * Two data_view instances are equal if they have the same size and the
+ * same content.
+ *
+ * @param lhs First object.
+ * @param rhs Second object.
+ */
+inline bool operator==(const data_view& lhs, const data_view& rhs) noexcept {
+    return lhs.size() == rhs.size() && !std::strcmp(lhs.data(), rhs.data());
+}
+
+/**
+ * Two data_view instances are not equal if they have different sizes or the
+ * content differs.
+ *
+ * @param lhs First object.
+ * @param rhs Second object.
+ */
+inline bool operator!=(const data_view& lhs, const data_view& rhs) noexcept {
+    return !(lhs == rhs);
+}
+
+#endif
+
 
 } // end namespace protozero
 

protozero/varint.hpp

@@ -23,13 +23,54 @@ documentation.
 namespace protozero {
 
 /**
- * The maximum length of a 64bit varint.
+ * The maximum length of a 64 bit varint.
  */
 constexpr const int8_t max_varint_length = sizeof(uint64_t) * 8 / 7 + 1;
 
-// from https://github.com/facebook/folly/blob/master/folly/Varint.h
+namespace detail {
+
+    // from https://github.com/facebook/folly/blob/master/folly/Varint.h
+    inline uint64_t decode_varint_impl(const char** data, const char* end) {
+        const int8_t* begin = reinterpret_cast<const int8_t*>(*data);
+        const int8_t* iend = reinterpret_cast<const int8_t*>(end);
+        const int8_t* p = begin;
+        uint64_t val = 0;
+
+        if (iend - begin >= max_varint_length) {  // fast path
+            do {
+                int64_t b;
+                b = *p++; val  = uint64_t((b & 0x7f)      ); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) <<  7); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 14); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 21); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 28); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 35); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 42); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 49); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 56); if (b >= 0) break;
+                b = *p++; val |= uint64_t((b & 0x7f) << 63); if (b >= 0) break;
+                throw varint_too_long_exception();
+            } while (false);
+        } else {
+            int shift = 0;
+            while (p != iend && *p < 0) {
+                val |= uint64_t(*p++ & 0x7f) << shift;
+                shift += 7;
+            }
+            if (p == iend) {
+                throw end_of_buffer_exception();
+            }
+            val |= uint64_t(*p++) << shift;
+        }
+
+        *data = reinterpret_cast<const char*>(p);
+        return val;
+    }
+
+} // end namespace detail
+
 /**
- * Decode a 64bit varint.
+ * Decode a 64 bit varint.
  *
  * Strong exception guarantee: if there is an exception the data pointer will
  * not be changed.
@@ -39,55 +80,69 @@ constexpr const int8_t max_varint_length = sizeof(uint64_t) * 8 / 7 + 1;
  * @param[in] end Pointer one past the end of the input data.
  * @returns The decoded integer
  * @throws varint_too_long_exception if the varint is longer then the maximum
- *         length that would fit in a 64bit int. Usually this means your data
+ *         length that would fit in a 64 bit int. Usually this means your data
  *         is corrupted or you are trying to read something as a varint that
  *         isn't.
  * @throws end_of_buffer_exception if the *end* of the buffer was reached
  *         before the end of the varint.
  */
 inline uint64_t decode_varint(const char** data, const char* end) {
-    const int8_t* begin = reinterpret_cast<const int8_t*>(*data);
-    const int8_t* iend = reinterpret_cast<const int8_t*>(end);
-    const int8_t* p = begin;
-    uint64_t val = 0;
-
-    if (iend - begin >= max_varint_length) {  // fast path
-        do {
-            int64_t b;
-            b = *p++; val  = uint64_t((b & 0x7f)      ); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) <<  7); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 14); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 21); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 28); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 35); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 42); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 49); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 56); if (b >= 0) break;
-            b = *p++; val |= uint64_t((b & 0x7f) << 63); if (b >= 0) break;
-            throw varint_too_long_exception();
-        } while (false);
-    } else {
-        int shift = 0;
-        while (p != iend && *p < 0) {
-            val |= uint64_t(*p++ & 0x7f) << shift;
-            shift += 7;
-        }
-        if (p == iend) {
-            throw end_of_buffer_exception();
-        }
-        val |= uint64_t(*p++) << shift;
+    // If this is a one-byte varint, decode it here.
+    if (end != *data && ((**data & 0x80) == 0)) {
+        uint64_t val = uint64_t(**data);
+        ++(*data);
+        return val;
     }
-
-    *data = reinterpret_cast<const char*>(p);
-    return val;
+    // If this varint is more than one byte, defer to complete implementation.
+    return detail::decode_varint_impl(data, end);
 }
 
 /**
- * Varint-encode a 64bit integer.
+ * Skip over a varint.
+ *
+ * Strong exception guarantee: if there is an exception the data pointer will
+ * not be changed.
+ *
+ * @param[in,out] data Pointer to pointer to the input data. After the function
+ *        returns this will point to the next data to be read.
+ * @param[in] end Pointer one past the end of the input data.
+ * @throws end_of_buffer_exception if the *end* of the buffer was reached
+ *         before the end of the varint.
  */
-template <typename OutputIterator>
-inline int write_varint(OutputIterator data, uint64_t value) {
-    int n=1;
+inline void skip_varint(const char** data, const char* end) {
+    const int8_t* begin = reinterpret_cast<const int8_t*>(*data);
+    const int8_t* iend = reinterpret_cast<const int8_t*>(end);
+    const int8_t* p = begin;
+
+    while (p != iend && *p < 0) {
+        ++p;
+    }
+
+    if (p >= begin + max_varint_length) {
+        throw varint_too_long_exception();
+    }
+
+    if (p == iend) {
+        throw end_of_buffer_exception();
+    }
+
+    ++p;
+
+    *data = reinterpret_cast<const char*>(p);
+}
+
+/**
+ * Varint encode a 64 bit integer.
+ *
+ * @tparam T An output iterator type.
+ * @param data Output iterator the varint encoded value will be written to
+ *             byte by byte.
+ * @param value The integer that will be encoded.
+ * @throws Any exception thrown by increment or dereference operator on data.
+ */
+template <typename T>
+inline int write_varint(T data, uint64_t value) {
+    int n = 1;
 
     while (value >= 0x80) {
         *data++ = char((value & 0x7f) | 0x80);
@@ -102,29 +157,29 @@ inline int write_varint(OutputIterator data, uint64_t value) {
 /**
  * ZigZag encodes a 32 bit integer.
  */
-inline uint32_t encode_zigzag32(int32_t value) noexcept {
+inline constexpr uint32_t encode_zigzag32(int32_t value) noexcept {
     return (static_cast<uint32_t>(value) << 1) ^ (static_cast<uint32_t>(value >> 31));
 }
 
 /**
  * ZigZag encodes a 64 bit integer.
  */
-inline uint64_t encode_zigzag64(int64_t value) noexcept {
+inline constexpr uint64_t encode_zigzag64(int64_t value) noexcept {
     return (static_cast<uint64_t>(value) << 1) ^ (static_cast<uint64_t>(value >> 63));
 }
 
 /**
  * Decodes a 32 bit ZigZag-encoded integer.
  */
-inline int32_t decode_zigzag32(uint32_t value) noexcept {
-    return int32_t(value >> 1) ^ -int32_t(value & 1);
+inline constexpr int32_t decode_zigzag32(uint32_t value) noexcept {
+    return static_cast<int32_t>(value >> 1) ^ -static_cast<int32_t>(value & 1);
 }
 
 /**
  * Decodes a 64 bit ZigZag-encoded integer.
  */
-inline int64_t decode_zigzag64(uint64_t value) noexcept {
-    return int64_t(value >> 1) ^ -int64_t(value & 1);
+inline constexpr int64_t decode_zigzag64(uint64_t value) noexcept {
+    return static_cast<int64_t>(value >> 1) ^ -static_cast<int64_t>(value & 1);
 }
 
 } // end namespace protozero

protozero/version.hpp

@@ -10,13 +10,25 @@ documentation.
 
 *****************************************************************************/
 
-#define PROTOZERO_VERSION_MAJOR 1
-#define PROTOZERO_VERSION_MINOR 3
-#define PROTOZERO_VERSION_PATCH 0
+/**
+ * @file version.hpp
+ *
+ * @brief Contains macros defining the protozero version.
+ */
 
+/// The major version number
+#define PROTOZERO_VERSION_MAJOR 1
+
+/// The minor version number
+#define PROTOZERO_VERSION_MINOR 5
+
+/// The patch number
+#define PROTOZERO_VERSION_PATCH 1
+
+/// The complete version number
 #define PROTOZERO_VERSION_CODE (PROTOZERO_VERSION_MAJOR * 10000 + PROTOZERO_VERSION_MINOR * 100 + PROTOZERO_VERSION_PATCH)
 
-#define PROTOZERO_VERSION_STRING "1.3.0"
-
+/// Version number as string
+#define PROTOZERO_VERSION_STRING "1.5.1"
 
 #endif // PROTOZERO_VERSION_HPP