deduction guides for 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
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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