deductionguidesforstdreference_wrapper(3)

deductionguidesforstd::reference_wrapper - deductionguidesforstd::reference_wrapper

Synopsis

Defined in header <functional> template<typename T> (since C++17) reference_wrapper(T&) -> reference_wrapper<T>;

One deduction_guide is provided for std::reference_wrapper to support deduction of the sole class template parameter.

Example

This section is incomplete Reason: no example

Defect reports

The 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 from reference_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