forked from boostorg/core
56 lines
952 B
C++
56 lines
952 B
C++
#ifndef BOOST_CORE_LAUNDER_HPP_INCLUDED
|
|
#define BOOST_CORE_LAUNDER_HPP_INCLUDED
|
|
|
|
// MS compatible compilers support #pragma once
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
// Copyright 2023 Peter Dimov
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
|
|
|
#if defined(__has_builtin)
|
|
# if __has_builtin(__builtin_launder)
|
|
# define BOOST_CORE_HAS_BUILTIN_LAUNDER
|
|
# endif
|
|
#endif
|
|
|
|
#if !defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
|
|
# include <new>
|
|
#endif
|
|
|
|
namespace boost
|
|
{
|
|
namespace core
|
|
{
|
|
|
|
#if defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
|
|
|
|
template<class T> T* launder( T* p )
|
|
{
|
|
return __builtin_launder( p );
|
|
}
|
|
|
|
#elif defined(__cpp_lib_launder)
|
|
|
|
template<class T> T* launder( T* p )
|
|
{
|
|
return std::launder( p );
|
|
}
|
|
|
|
#else
|
|
|
|
template<class T> T* launder( T* p )
|
|
{
|
|
return p;
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace core
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_CORE_LAUNDER_HPP_INCLUDED
|