109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
#ifndef BOOST_CORE_MEMORY_RESOURCE_HPP_INCLUDED
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#define BOOST_CORE_MEMORY_RESOURCE_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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#include <boost/core/max_align.hpp>
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#include <boost/config.hpp>
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#include <boost/config/workaround.hpp>
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#include <cstddef>
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// Define our own placement new to avoid the inclusion of <new>
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// (~9K extra lines) at Ion Gaztanhaga's request.
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//
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// We can use our own because [intro.object] p13 says:
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//
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// Any implicit or explicit invocation of a function named `operator new`
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// or `operator new[]` implicitly creates objects in the returned region of
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// storage and returns a pointer to a suitable created object.
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namespace boost
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{
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namespace core
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{
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namespace detail
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{
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struct placement_new_tag {};
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} // namespace detail
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} // namespace core
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} // namespace boost
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inline void* operator new( std::size_t, void* p, boost::core::detail::placement_new_tag )
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{
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return p;
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}
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inline void operator delete( void*, void*, boost::core::detail::placement_new_tag )
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{
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}
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namespace boost
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{
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namespace core
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{
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class memory_resource
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{
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public:
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#if defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || BOOST_WORKAROUND(BOOST_GCC, < 40700)
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virtual ~memory_resource() {}
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#else
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virtual ~memory_resource() = default;
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#endif
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BOOST_ATTRIBUTE_NODISCARD void* allocate( std::size_t bytes, std::size_t alignment = max_align )
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{
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// https://github.com/boostorg/container/issues/199
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// https://cplusplus.github.io/LWG/issue3471
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return ::operator new( bytes, do_allocate( bytes, alignment ), core::detail::placement_new_tag() );
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}
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void deallocate( void* p, std::size_t bytes, std::size_t alignment = max_align )
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{
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do_deallocate( p, bytes, alignment );
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}
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bool is_equal( memory_resource const & other ) const BOOST_NOEXCEPT
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{
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return do_is_equal( other );
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}
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private:
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virtual void* do_allocate( std::size_t bytes, std::size_t alignment ) = 0;
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virtual void do_deallocate( void* p, std::size_t bytes, std::size_t alignment ) = 0;
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virtual bool do_is_equal( memory_resource const & other ) const BOOST_NOEXCEPT = 0;
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};
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inline bool operator==( memory_resource const& a, memory_resource const& b ) BOOST_NOEXCEPT
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{
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return &a == &b || a.is_equal( b );
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}
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inline bool operator!=( memory_resource const& a, memory_resource const& b ) BOOST_NOEXCEPT
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{
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return !( a == b );
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}
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} // namespace core
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} // namespace boost
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#endif // #ifndef BOOST_CORE_MEMORY_RESOURCE_HPP_INCLUDED
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