forked from boostorg/core
56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#ifndef BOOST_CORE_LAUNDER_HPP_INCLUDED
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#define BOOST_CORE_LAUNDER_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// Copyright 2023 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#if defined(__has_builtin)
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# if __has_builtin(__builtin_launder)
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# define BOOST_CORE_HAS_BUILTIN_LAUNDER
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# endif
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#endif
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#if (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) && !defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
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# include <new>
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#endif
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namespace boost
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{
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namespace core
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{
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#if defined(BOOST_CORE_HAS_BUILTIN_LAUNDER)
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template<class T> T* launder( T* p )
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{
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return __builtin_launder( p );
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}
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#elif (__cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) && defined(__cpp_lib_launder)
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template<class T> T* launder( T* p )
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{
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return std::launder( p );
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}
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#else
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template<class T> T* launder( T* p )
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{
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return p;
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}
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#endif
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} // namespace core
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} // namespace boost
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#endif // #ifndef BOOST_CORE_LAUNDER_HPP_INCLUDED
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