86 lines
1.6 KiB
C++
86 lines
1.6 KiB
C++
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//
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/json
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//
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#ifndef BOOST_JSON_DETAIL_SHARED_RESOURCE_HPP
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#define BOOST_JSON_DETAIL_SHARED_RESOURCE_HPP
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#include <boost/json/memory_resource.hpp>
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#include <atomic>
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#include <utility>
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BOOST_JSON_NS_BEGIN
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namespace detail {
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class
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#endif
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struct BOOST_SYMBOL_VISIBLE
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shared_resource
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: memory_resource
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{
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BOOST_JSON_DECL
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shared_resource();
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BOOST_JSON_DECL
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~shared_resource();
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std::atomic<std::size_t> refs{ 1 };
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};
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template<class T>
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class shared_resource_impl final
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: public shared_resource
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{
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T t;
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public:
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template<class... Args>
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shared_resource_impl(
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Args&&... args)
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: t(std::forward<Args>(args)...)
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{
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}
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void*
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do_allocate(
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std::size_t n,
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std::size_t align) override
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{
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return t.allocate(n, align);
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}
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void
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do_deallocate(
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void* p,
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std::size_t n,
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std::size_t align) override
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{
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return t.deallocate(p, n, align);
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}
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bool
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do_is_equal(
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memory_resource const&) const noexcept override
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{
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// VFALCO Is always false ok?
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return false;
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}
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};
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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} // detail
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BOOST_JSON_NS_END
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#endif
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