tmp/tmp0_wqo33h/{from.md → to.md}
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| 1 |
+
### Function template `not_fn` <a id="func.not_fn">[[func.not_fn]]</a>
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``` cpp
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template <class F> unspecified not_fn(F&& f);
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```
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*Effects:* Equivalent to
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`return `*`call_wrapper`*`(std::forward<F>(f));` where *`call_wrapper`*
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is an exposition only class defined as follows:
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``` cpp
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class call_wrapper {
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using FD = decay_t<F>;
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FD fd;
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explicit call_wrapper(F&& f);
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public:
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call_wrapper(call_wrapper&&) = default;
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call_wrapper(const call_wrapper&) = default;
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template<class... Args>
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auto operator()(Args&&...) &
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-> decltype(!declval<invoke_result_t<FD&, Args...>>());
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template<class... Args>
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auto operator()(Args&&...) const&
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-> decltype(!declval<invoke_result_t<const FD&, Args...>>());
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template<class... Args>
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auto operator()(Args&&...) &&
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-> decltype(!declval<invoke_result_t<FD, Args...>>());
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template<class... Args>
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auto operator()(Args&&...) const&&
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-> decltype(!declval<invoke_result_t<const FD, Args...>>());
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};
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```
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``` cpp
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explicit call_wrapper(F&& f);
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```
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*Requires:* `FD` shall satisfy the requirements of `MoveConstructible`.
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`is_constructible_v<FD, F>` shall be `true`. `fd` shall be a callable
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| 46 |
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object ([[func.def]]).
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*Effects:* Initializes `fd` from `std::forward<F>(f)`.
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*Throws:* Any exception thrown by construction of `fd`.
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``` cpp
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template<class... Args>
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auto operator()(Args&&... args) &
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-> decltype(!declval<invoke_result_t<FD&, Args...>>());
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template<class... Args>
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| 57 |
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auto operator()(Args&&... args) const&
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| 58 |
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-> decltype(!declval<invoke_result_t<const FD&, Args...>>());
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```
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+
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*Effects:* Equivalent to:
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| 62 |
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``` cpp
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return !INVOKE(fd, std::forward<Args>(args)...); // see [func.require]
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| 65 |
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```
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| 66 |
+
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| 67 |
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``` cpp
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| 68 |
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template<class... Args>
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| 69 |
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auto operator()(Args&&... args) &&
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| 70 |
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-> decltype(!declval<invoke_result_t<FD, Args...>>());
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| 71 |
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template<class... Args>
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| 72 |
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auto operator()(Args&&... args) const&&
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-> decltype(!declval<invoke_result_t<const FD, Args...>>());
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```
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| 75 |
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*Effects:* Equivalent to:
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| 78 |
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``` cpp
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return !INVOKE(std::move(fd), std::forward<Args>(args)...); // see [func.require]
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| 80 |
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```
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