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util/string.h: add 'Const_byte_range_ptr'

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The new 'Const_byte_range_ptr' type is suitable as argument type that
refers to a read-only byte buffer, e.g., the source buffer of a write
operation.
This commit is contained in:
Norman Feske 2023-02-09 11:26:57 +01:00 committed by Christian Helmuth
parent 73f7f8aef6
commit 07e3e09652
1 changed files with 23 additions and 5 deletions
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28
repos/base/include/util/string.h
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@ -18,12 +18,14 @@
#include <base/stdint.h> #include <base/stdint.h>
#include <base/output.h> #include <base/output.h>
#include <util/misc_math.h> #include <util/misc_math.h>
#include <util/noncopyable.h>
#include <cpu/string.h> #include <cpu/string.h>
namespace Genode { namespace Genode {
class Number_of_bytes; class Number_of_bytes;
class Byte_range_ptr; class Byte_range_ptr;
class Const_byte_range_ptr;
class Cstring; class Cstring;
template <Genode::size_t> class String; template <Genode::size_t> class String;
} }
@ -69,21 +71,37 @@ class Genode::Number_of_bytes
/** /**
* Data structure for describing a byte buffer * Data structure for describing a mutable byte buffer
* *
* The type is intended to be used as 'Byte_range_ptr const &' argument. * The type is intended to be used as 'Byte_range_ptr const &' argument.
* It is deliberately non-copyable.
*/ */
struct Genode::Byte_range_ptr struct Genode::Byte_range_ptr : Noncopyable
{ {
char * const start; struct {
size_t const num_bytes; char * const start;
size_t const num_bytes;
};
Byte_range_ptr(char *start, size_t num_bytes) Byte_range_ptr(char *start, size_t num_bytes)
: start(start), num_bytes(num_bytes) { } : start(start), num_bytes(num_bytes) { }
}; };
/**
* Data structure for describing a constant byte buffer
*/
struct Genode::Const_byte_range_ptr : Noncopyable
{
struct {
char const * const start;
size_t const num_bytes;
};
Const_byte_range_ptr(char const *start, size_t num_bytes)
: start(start), num_bytes(num_bytes) { }
};
/*********************** /***********************
** Utility functions ** ** Utility functions **
***********************/ ***********************/