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39 lines
743 B
C++
39 lines
743 B
C++
#ifndef MAPBOX_UTIL_VARIANT_VISITOR_HPP
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#define MAPBOX_UTIL_VARIANT_VISITOR_HPP
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namespace mapbox {
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namespace util {
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template <typename... Fns>
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struct visitor;
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template <typename Fn>
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struct visitor<Fn> : Fn
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{
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using type = Fn;
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using Fn::operator();
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visitor(Fn fn) : Fn(fn) {}
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};
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template <typename Fn, typename... Fns>
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struct visitor<Fn, Fns...> : Fn, visitor<Fns...>
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{
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using type = visitor;
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using Fn::operator();
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using visitor<Fns...>::operator();
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visitor(Fn fn, Fns... fns) : Fn(fn), visitor<Fns...>(fns...) {}
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};
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template <typename... Fns>
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visitor<Fns...> make_visitor(Fns... fns)
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{
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return visitor<Fns...>(fns...);
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}
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} // namespace util
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} // namespace mapbox
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#endif // MAPBOX_UTIL_VARIANT_VISITOR_HPP
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