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Respect the OutputIterator value_type in to_chars

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This commit is contained in:
Peter Dimov
2026-01-13 17:47:01 +02:00
parent aa6c1a7985
commit 0b6a9ade9a
1 changed files with 41 additions and 2 deletions
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43
include/boost/uuid/uuid_io.hpp
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@@ -14,6 +14,7 @@
#include <boost/config.hpp>
#include <iosfwd>
#include <ios>
#include <iterator>
#include <string>
#include <cstddef>
@@ -22,10 +23,48 @@ namespace uuids {
// to_chars
template<class OutputIterator>
namespace detail
{
template<class Vt> struct output_value_type
{
using type = char;
};
template<> struct output_value_type<wchar_t>
{
using type = wchar_t;
};
template<> struct output_value_type<char16_t>
{
using type = char16_t;
};
template<> struct output_value_type<char32_t>
{
using type = char32_t;
};
#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
template<> struct output_value_type<char8_t>
{
using type = char8_t;
};
#endif
} // namespace detail
template<class OutputIterator,
class Vt = typename std::iterator_traits<OutputIterator>::value_type
>
BOOST_CXX14_CONSTEXPR OutputIterator to_chars( uuid const& u, OutputIterator out )
{
alignas( 16 ) char tmp[ 36 ] = {};
using Ch = typename detail::output_value_type<Vt>::type;
alignas( 16 ) Ch tmp[ 36 ] = {};
detail::to_chars( u, tmp );
for( std::size_t i = 0; i < 36; ++i )