deduction guides for std::reference_wrapper

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Old binders and adaptors
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)  
(until C++17*)
(until C++17*) (until C++17*) (until C++17*) (until C++17*)
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(until C++17*)(until C++17*)
(until C++17*)(until C++17*)

(until C++17*)
(until C++17*) (until C++17*) (until C++17*) (until C++17*)
(until C++20*)
(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

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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