template< typename T >
reference_wrapper( T& ) -> reference_wrapper<T>;
One deduction guide is provided for std::reference_wrapper to support deduction of the sole class template parameter.
[edit] Example [edit] Defect reportsThe following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2981 C++17 a redundant deduction guide fromreference_wrapper<T> was provided removed LWG 2993 C++17 defect resolution removed a constructor used for class template argument deduction added deduction guide to compensate
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