mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
325 lines
9.4 KiB
C++
325 lines
9.4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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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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#ifndef SPROUT_FUNCTIONAL_REF_HPP
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#define SPROUT_FUNCTIONAL_REF_HPP
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#include <type_traits>
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#include <functional>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type_traits/has_xxx.hpp>
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#include <sprout/type_traits/inherit_if_xxx.hpp>
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#include <sprout/functional/base.hpp>
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#include <sprout/functional/type_traits/weak_result_type.hpp>
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#include <sprout/functional/type_traits/has_type.hpp>
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namespace sprout {
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// 20.8.3 reference_wrapper
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namespace detail {
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template<bool Unary, bool Binary, typename T>
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struct reference_wrapper_base_impl;
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template<typename T>
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struct reference_wrapper_base_impl<false, false, T>
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: public sprout::weak_result_type<T>
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{};
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template<typename T>
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struct reference_wrapper_base_impl<true, false, T>
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: public sprout::weak_result_type<T>
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{
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public:
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typedef typename T::argument_type argument_type;
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};
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template<typename T>
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struct reference_wrapper_base_impl<false, true, T>
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: public sprout::weak_result_type<T>
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{
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public:
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typedef typename T::first_argument_type first_argument_type;
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typedef typename T::second_argument_type second_argument_type;
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};
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template<typename T>
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struct reference_wrapper_base_impl<true, true, T>
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: public sprout::weak_result_type<T>
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{
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public:
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typedef typename T::argument_type argument_type;
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typedef typename T::first_argument_type first_argument_type;
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typedef typename T::second_argument_type second_argument_type;
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};
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template<typename T>
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struct reference_wrapper_base
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: public sprout::detail::reference_wrapper_base_impl<
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sprout::has_argument_type<T>::value,
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sprout::has_first_argument_type<T>::value
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&& sprout::has_second_argument_type<T>::value
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,
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T
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>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res(T1)>
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: public sprout::unary_function<T1, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res(T1) const>
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: public sprout::unary_function<T1, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res(T1) volatile>
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: public sprout::unary_function<T1, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res(T1) const volatile>
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: public sprout::unary_function<T1, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res(T1, T2)>
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: public sprout::binary_function<T1, T2, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res(T1, T2) const>
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: public sprout::binary_function<T1, T2, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res(T1, T2) volatile>
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: public sprout::binary_function<T1, T2, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res(T1, T2) const volatile>
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: public sprout::binary_function<T1, T2, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res(*)(T1)>
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: public sprout::unary_function<T1, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res(*)(T1, T2)>
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: public sprout::binary_function<T1, T2, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res (T1::*)()>
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: public sprout::unary_function<T1*, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res (T1::*)(T2)>
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: public sprout::binary_function<T1*, T2, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res (T1::*)() const>
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: public sprout::unary_function<T1 const*, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res (T1::*)(T2) const>
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: public sprout::binary_function<T1 const*, T2, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res (T1::*)() volatile>
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: public sprout::unary_function<T1 volatile*, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res (T1::*)(T2) volatile>
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: public sprout::binary_function<T1 volatile*, T2, Res>
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{};
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template<typename Res, typename T1>
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struct reference_wrapper_base<Res (T1::*)() const volatile>
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: public sprout::unary_function<T1 const volatile*, Res>
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{};
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template<typename Res, typename T1, typename T2>
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struct reference_wrapper_base<Res (T1::*)(T2) const volatile>
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: public sprout::binary_function<T1 const volatile*, T2, Res>
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{};
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} // namespace detail
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template<typename T>
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class reference_wrapper
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: public sprout::detail::reference_wrapper_base<typename std::remove_cv<T>::type>
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{
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public:
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// types
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typedef T type;
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private:
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T* t_;
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private:
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reference_wrapper(T&&) SPROUT_DELETED_FUNCTION_DECL
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public:
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// construct/copy/destroy
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SPROUT_CONSTEXPR reference_wrapper(T& t) SPROUT_NOEXCEPT
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: t_(&t)
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{}
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reference_wrapper(reference_wrapper const&) = default;
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// assignment
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SPROUT_CXX14_CONSTEXPR reference_wrapper& operator=(reference_wrapper const& rhs) {
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t_ = rhs.t_;
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return *this;
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}
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// access
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SPROUT_CONSTEXPR operator T& () const SPROUT_NOEXCEPT {
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return *t_;
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}
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SPROUT_CONSTEXPR T& get() const SPROUT_NOEXCEPT {
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return *t_;
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}
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SPROUT_CONSTEXPR T* get_pointer() const SPROUT_NOEXCEPT {
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return t_;
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}
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// invocation
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template<typename... Args>
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SPROUT_CONSTEXPR typename std::result_of<T& (Args&&...)>::type
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operator()(Args&&... args) const {
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return (*t_)(SPROUT_FORWARD(Args, args)...);
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}
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};
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//
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// ref
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// cref
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//
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::reference_wrapper<T>
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ref(T& t) SPROUT_NOEXCEPT {
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return sprout::reference_wrapper<T>(t);
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}
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::reference_wrapper<T const>
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cref(T const& t) SPROUT_NOEXCEPT {
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return sprout::reference_wrapper<T const>(t);
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}
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template<typename T>
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void ref(T const&&) SPROUT_DELETED_FUNCTION_DECL
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template<typename T>
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void cref(T const&&) SPROUT_DELETED_FUNCTION_DECL
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::reference_wrapper<T>
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ref(sprout::reference_wrapper<T> t) SPROUT_NOEXCEPT {
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return t;
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}
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::reference_wrapper<T const>
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cref(sprout::reference_wrapper<T> t) SPROUT_NOEXCEPT {
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return sprout::reference_wrapper<T const>(t.get());
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}
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//
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// is_reference_wrapper
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//
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template<typename T>
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struct is_reference_wrapper
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: public sprout::false_type
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{};
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template<typename T>
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struct is_reference_wrapper<T const>
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: public sprout::is_reference_wrapper<T>
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{};
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template<typename T>
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struct is_reference_wrapper<T volatile>
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: public sprout::is_reference_wrapper<T>
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{};
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template<typename T>
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struct is_reference_wrapper<T const volatile>
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: public sprout::is_reference_wrapper<T>
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{};
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template<typename T>
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struct is_reference_wrapper<sprout::reference_wrapper<T> >
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: public sprout::true_type
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{};
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//
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// unwrap_reference
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//
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template<typename T>
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struct unwrap_reference {
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public:
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typedef T type;
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};
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template<typename T>
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struct unwrap_reference<sprout::reference_wrapper<T> > {
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public:
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typedef T type;
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};
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template<typename T>
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struct unwrap_reference<std::reference_wrapper<T> > {
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public:
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typedef T type;
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};
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template<typename T>
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struct unwrap_reference<T const>
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: public sprout::unwrap_reference<T>
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{};
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template<typename T>
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struct unwrap_reference<T volatile>
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: public sprout::unwrap_reference<T>
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{};
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template<typename T>
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struct unwrap_reference<T const volatile>
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: public sprout::unwrap_reference<T>
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{};
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//
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// strip_reference
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//
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template<typename T>
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struct strip_reference {
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public:
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typedef T type;
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};
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template<typename T>
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struct strip_reference<sprout::reference_wrapper<T> > {
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public:
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typedef T& type;
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};
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template<typename T>
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struct strip_reference<std::reference_wrapper<T> > {
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public:
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typedef T& type;
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};
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template<typename T>
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struct strip_reference<T const>
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: public sprout::strip_reference<T>
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{};
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template<typename T>
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struct strip_reference<T volatile>
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: public sprout::strip_reference<T>
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{};
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template<typename T>
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struct strip_reference<T const volatile>
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: public sprout::strip_reference<T>
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{};
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//
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// unwrap_ref
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//
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template<typename T>
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inline SPROUT_CONSTEXPR typename sprout::unwrap_reference<T>::type&
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unwrap_ref(T& t) {
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return t;
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}
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template<typename T>
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inline SPROUT_CONSTEXPR typename sprout::unwrap_reference<T const>::type&
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unwrap_ref(T const& t) {
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return t;
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}
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//
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// get_pointer
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//
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template<typename T>
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inline SPROUT_CONSTEXPR T*
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get_pointer(sprout::reference_wrapper<T> const& r) {
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return r.get_pointer();
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}
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template<typename T>
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inline SPROUT_CONSTEXPR T*
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get_pointer(std::reference_wrapper<T> const& r) {
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return &r.get();
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_REF_HPP
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