std::refere...ence_wrapper(3) C++ Standard Libary std::refere...ence_wrapper(3) NAME std::reference_wrapper::reference_wrapper - std::reference_wrapper::refer- ence_wrapper Synopsis template< class U > (1) (since C++11) reference_wrapper( U&& x ) noexcept(/*see below*/) ; (constexpr since C++20) reference_wrapper( const reference_wrapper& other ) (2) (since C++11) noexcept; (constexpr since C++20) Constructs a new reference wrapper. 1) Converts x to T& as if by T& t = std::forward<U>(x);, then stores a reference to t. This overload participates in overload resolution only if typename std::decay<U>::type is not the same type as reference_wrapper and the expression FUN(std::declval<U>()) is well-formed, where FUN names the set of imagi- nary functions void FUN(T&) noexcept; void FUN(T&&) = delete; 2) Copy constructor. Stores a reference to other.get(). Parameters x - an object to wrap other - another reference wrapper Exceptions 1) noexcept specification: noexcept(noexcept(FUN(std::declval<U>()))) where FUN is the set of imaginary functions described in the description above. Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior deleted reference_wrapper(T&&) constructor replaced with a LWG 2993 C++11 interferes construc- tor template with overload resolution in some cases Categories: * conditionally noexcept * Todo no example http://cppreference.com 2024.06.10 std::refere...ence_wrapper(3)
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