tmp/tmpiwypzzkr/{from.md → to.md}
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### Function template `mem_fn` <a id="func.memfn">[[func.memfn]]</a>
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``` cpp
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template<class R, class T> unspecified mem_fn(R T::* pm);
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```
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*Returns:* A simple call wrapper ([[func.def]]) `fn` such that the
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expression `fn(t, a2, ..., aN)` is equivalent to
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nested type `result_type` that is a synonym for the return type of `pm`
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when `pm` is a pointer to member function.
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The simple call wrapper shall define two nested types named
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`argument_type` and `result_type` as synonyms for `cv T*` and `Ret`,
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respectively, when `pm` is a pointer to member function with
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cv-qualifier *cv* and taking no arguments, where *Ret* is `pm`’s return
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type.
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The simple call wrapper shall define three nested types named
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`first_argument_type`, `second_argument_type`, and `result_type` as
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synonyms for `cv T*`, `T1`, and `Ret`, respectively, when `pm` is a
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pointer to member function with cv-qualifier *cv* and taking one
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argument of type `T1`, where *Ret* is `pm`’s return type.
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*Throws:* Nothing.
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### Function template `mem_fn` <a id="func.memfn">[[func.memfn]]</a>
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``` cpp
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template<class R, class T> unspecified mem_fn(R T::* pm) noexcept;
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```
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*Returns:* A simple call wrapper ([[func.def]]) `fn` such that the
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expression `fn(t, a2, ..., aN)` is equivalent to *INVOKE*(pm, t, a2,
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..., aN) ([[func.require]]).
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