91 lines
1.8 KiB
C++
91 lines
1.8 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/core/allocator_access.hpp>
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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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typedef void _default_construct_destroy;
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template<class U>
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struct rebind {
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typedef noinit_adaptor<typename allocator_rebind<A, U>::type> other;
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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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template<class U>
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noinit_adaptor(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 A&>(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_ALLOCATOR)
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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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#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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(void)p;
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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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