tmp/tmp27lgii3m/{from.md → to.md}
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### 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> constexpr unspecified not_fn(F&& f);
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```
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In the text that follows:
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- `g` is a value of the result of a `not_fn` invocation,
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- `FD` is the type `decay_t<F>`,
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- `fd` is the target object of `g` [[func.def]] of type `FD`,
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direct-non-list-initialized with `std::forward<F>(f)`,
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- `call_args` is an argument pack used in a function call
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expression [[expr.call]] of `g`.
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*Mandates:* `is_constructible_v<FD, F> && is_move_constructible_v<FD>`
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is `true`.
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*Preconditions:* `FD` meets the *Cpp17MoveConstructible* requirements.
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*Returns:* A perfect forwarding call wrapper `g` with call pattern
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`!invoke(fd, call_args...)`.
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*Throws:* Any exception thrown by the initialization of `fd`.
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