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125 lines
2.6 KiB
C++
125 lines
2.6 KiB
C++
#ifndef MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP
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#define MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP
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// Based on variant/recursive_wrapper.hpp from boost.
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//
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// Original license:
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//
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// Copyright (c) 2002-2003
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// Eric Friedman, Itay Maman
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <cassert>
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#include <utility>
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//namespace mapbox {
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//namespace util {
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namespace std {
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template <typename T>
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class recursive_wrapper
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{
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T* p_;
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void assign(T const& rhs)
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{
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this->get() = rhs;
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}
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public:
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using type = T;
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/**
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* Default constructor default initializes the internally stored value.
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* For POD types this means nothing is done and the storage is
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* uninitialized.
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*
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* @throws std::bad_alloc if there is insufficient memory for an object
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* of type T.
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* @throws any exception thrown by the default constructur of T.
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*/
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recursive_wrapper()
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: p_(new T){}
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~recursive_wrapper() noexcept { delete p_; }
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recursive_wrapper(recursive_wrapper const& operand)
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: p_(new T(operand.get())) {}
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recursive_wrapper(T const& operand)
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: p_(new T(operand)) {}
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recursive_wrapper(recursive_wrapper&& operand)
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: p_(new T(std::move(operand.get()))) {}
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recursive_wrapper(T&& operand)
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: p_(new T(std::move(operand))) {}
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inline recursive_wrapper& operator=(recursive_wrapper const& rhs)
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{
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assign(rhs.get());
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return *this;
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}
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inline recursive_wrapper& operator=(T const& rhs)
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{
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assign(rhs);
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return *this;
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}
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inline void swap(recursive_wrapper& operand) noexcept
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{
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T* temp = operand.p_;
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operand.p_ = p_;
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p_ = temp;
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}
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recursive_wrapper& operator=(recursive_wrapper&& rhs) noexcept
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{
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swap(rhs);
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return *this;
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}
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recursive_wrapper& operator=(T&& rhs)
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{
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get() = std::move(rhs);
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return *this;
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}
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T& get()
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{
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assert(p_);
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return *get_pointer();
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}
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T const& get() const
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{
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assert(p_);
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return *get_pointer();
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}
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T* get_pointer() { return p_; }
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const T* get_pointer() const { return p_; }
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operator T const&() const { return this->get(); }
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operator T&() { return this->get(); }
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}; // class recursive_wrapper
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template <typename T>
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inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs) noexcept
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{
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lhs.swap(rhs);
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}
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}
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//} // namespace util
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//} // namespace mapbox
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#endif // MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP
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