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Make uuid constructor constexpr when __builtin_is_constant_evaluated is available. Refs #161.

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This commit is contained in:
Peter Dimov
2024-09-22 20:36:43 +03:00
parent 6c43a6dda3
commit 7407a98684
1 changed files with 43 additions and 8 deletions
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51
include/boost/uuid/uuid.hpp
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@@ -20,6 +20,16 @@
#include <cstdint>
#include <cstring>
#if defined(__has_builtin)
# if __has_builtin(__builtin_is_constant_evaluated)
# define BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL
# endif
#endif
#if !defined(BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL) && defined(BOOST_MSVC) && BOOST_MSVC >= 1925
# define BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL
#endif
#if defined(__cpp_impl_three_way_comparison) && __cpp_impl_three_way_comparison >= 201907L && defined(__has_include)
# if __has_include(<compare>)
# include <compare>
@@ -66,19 +76,19 @@ private:
public:
operator repr_type& () noexcept { return repr_; }
operator repr_type const& () const noexcept { return repr_; }
BOOST_CXX14_CONSTEXPR operator repr_type& () noexcept { return repr_; }
constexpr operator repr_type const& () const noexcept { return repr_; }
std::uint8_t* operator()() noexcept { return repr_; }
std::uint8_t const* operator()() const noexcept { return repr_; }
BOOST_CXX14_CONSTEXPR std::uint8_t* operator()() noexcept { return repr_; }
constexpr std::uint8_t const* operator()() const noexcept { return repr_; }
#if BOOST_WORKAROUND(BOOST_MSVC, < 1930)
std::uint8_t* operator+( std::ptrdiff_t i ) noexcept { return repr_ + i; }
std::uint8_t const* operator+( std::ptrdiff_t i ) const noexcept { return repr_ + i; }
BOOST_CXX14_CONSTEXPR std::uint8_t* operator+( std::ptrdiff_t i ) noexcept { return repr_ + i; }
constexpr std::uint8_t const* operator+( std::ptrdiff_t i ) const noexcept { return repr_ + i; }
std::uint8_t& operator[]( std::ptrdiff_t i ) noexcept { return repr_[ i ]; }
std::uint8_t const& operator[]( std::ptrdiff_t i ) const noexcept { return repr_[ i ]; }
BOOST_CXX14_CONSTEXPR std::uint8_t& operator[]( std::ptrdiff_t i ) noexcept { return repr_[ i ]; }
constexpr std::uint8_t const& operator[]( std::ptrdiff_t i ) const noexcept { return repr_[ i ]; }
#endif
};
@@ -103,11 +113,36 @@ public:
uuid() = default;
#if defined(BOOST_NO_CXX14_CONSTEXPR)
uuid( repr_type const& r )
{
std::memcpy( data, r, 16 );
}
#elif defined(BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL)
constexpr uuid( repr_type const& r )
{
if( __builtin_is_constant_evaluated() )
{
for( int i = 0; i < 16; ++i ) data[ i ] = r[ i ];
}
else
{
std::memcpy( data, r, 16 );
}
}
#else
uuid( repr_type const& r )
{
std::memcpy( data, r, 16 );
}
#endif
// iteration
using value_type = std::uint8_t;