deduction guides for std::reference_wrapper

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Function objects
Function invocation
(C++17) (C++23)
Identity function object
(C++20)
Old binders and adaptors
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( until C++20* )
std::reference_wrapper
Defined in header <functional>
template < typename T >
reference_wrapper ( T & ) - > reference_wrapper < T > ;
(since C++17)

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
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