mirror of
https://github.com/yuzu-emu/ext-boost.git
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113 lines
2.4 KiB
C++
113 lines
2.4 KiB
C++
/*
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Copyright 2019 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License, Version 1.0.
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(http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CORE_NOINIT_ADAPTOR_HPP
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#define BOOST_CORE_NOINIT_ADAPTOR_HPP
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#include <boost/config.hpp>
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#if !defined(BOOST_NO_CXX11_ALLOCATOR)
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#include <memory>
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#endif
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#include <new>
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#include <utility>
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#endif
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namespace boost {
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template<class A>
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struct noinit_adaptor
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: A {
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template<class U>
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struct rebind {
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#if !defined(BOOST_NO_CXX11_ALLOCATOR)
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typedef noinit_adaptor<typename std::allocator_traits<A>::template
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rebind_alloc<U> > other;
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#else
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typedef noinit_adaptor<typename A::template rebind<U>::other> other;
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#endif
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};
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noinit_adaptor()
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: A() { }
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template<class U>
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noinit_adaptor(U&& u) BOOST_NOEXCEPT
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: A(std::forward<U>(u)) { }
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#else
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template<class U>
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noinit_adaptor(const U& u) BOOST_NOEXCEPT
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: A(u) { }
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#endif
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template<class U>
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noinit_adaptor(const noinit_adaptor<U>& u) BOOST_NOEXCEPT
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: A(static_cast<const U&>(u)) { }
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template<class U>
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void construct(U* p) {
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::new((void*)p) U;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template<class U, class V, class... Args>
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void construct(U* p, V&& v, Args&&... args) {
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::new((void*)p) U(std::forward<V>(v), std::forward<Args>(args)...);
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}
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#else
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template<class U, class V>
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void construct(U* p, V&& v) {
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::new((void*)p) U(std::forward<V>(v));
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}
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#endif
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#else
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template<class U, class V>
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void construct(U* p, const V& v) {
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::new((void*)p) U(v);
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}
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template<class U, class V>
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void construct(U* p, V& v) {
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::new((void*)p) U(v);
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}
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#endif
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template<class U>
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void destroy(U* p) {
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p->~U();
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}
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};
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template<class T, class U>
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inline bool
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operator==(const noinit_adaptor<T>& lhs,
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const noinit_adaptor<U>& rhs) BOOST_NOEXCEPT
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{
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return static_cast<const T&>(lhs) == static_cast<const U&>(rhs);
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}
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template<class T, class U>
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inline bool
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operator!=(const noinit_adaptor<T>& lhs,
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const noinit_adaptor<U>& rhs) BOOST_NOEXCEPT
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{
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return !(lhs == rhs);
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}
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template<class A>
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inline noinit_adaptor<A>
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noinit_adapt(const A& a) BOOST_NOEXCEPT
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{
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return noinit_adaptor<A>(a);
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}
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} /* boost */
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#endif
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