deduction guides for std::reference_wrapper
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std::reference_wrapper
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Defined in header
<functional>
template< typename T >
reference_wrapper( T& ) -> reference_wrapper<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.
[edit] Example
This section is incomplete
Reason: no example
Reason: no example
[edit] 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 |