namespace std {
template <class T> class reference_wrapper {
public :
using type = T;
reference_wrapper(T&) noexcept;
reference_wrapper(T&&) = delete; reference_wrapper(const reference_wrapper& x) noexcept;
reference_wrapper& operator=(const reference_wrapper& x) noexcept;
operator T& () const noexcept;
T& get() const noexcept;
template <class... ArgTypes>
invoke_result_t<T&, ArgTypes...>
operator() (ArgTypes&&...) const;
};
template<class T>
reference_wrapper(reference_wrapper<T>) -> reference_wrapper<T>;
}
reference_wrapper<T> is a CopyConstructible and CopyAssignable wrapper around a reference to an object or function of type T.
23.14.5.1 reference_wrapper construct/copy/destroy [refwrap.const]reference_wrapper(T& t) noexcept;
Effects: Constructs a reference_wrapper object that stores a reference to t.
reference_wrapper(const reference_wrapper& x) noexcept;
Effects: Constructs a reference_wrapper object that stores a reference to x.get().
23.14.5.2 reference_wrapper assignment [refwrap.assign]reference_wrapper& operator=(const reference_wrapper& x) noexcept;
Postconditions: *this stores a reference to x.get().
23.14.5.3 reference_wrapper access [refwrap.access]operator T& () const noexcept;
Returns: The stored reference.
T& get() const noexcept;
Returns: The stored reference.
23.14.5.4 reference_wrapper invocation [refwrap.invoke]template <class... ArgTypes> invoke_result_t<T&, ArgTypes...> operator()(ArgTypes&&... args) const;
Returns: INVOKE(get(), std::forward<ArgTypes>(args)...). ([func.require])
23.14.5.5 reference_wrapper helper functions [refwrap.helpers]template <class T> reference_wrapper<T> ref(T& t) noexcept;
Returns: reference_wrapper<T>(t).
template <class T> reference_wrapper<T> ref(reference_wrapper<T> t) noexcept;
template <class T> reference_wrapper<const T> cref(const T& t) noexcept;
Returns: reference_wrapper <const T>(t).
template <class T> reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;
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