template <class F> unspecified not_fn(F&& f);
Effects: Equivalent to return call_wrapper(std::forward<F>(f)); where call_wrapper is an exposition only class defined as follows:
class call_wrapper {
using FD = decay_t<F>;
FD fd;
explicit call_wrapper(F&& f);
public:
call_wrapper(call_wrapper&&) = default;
call_wrapper(const call_wrapper&) = default;
template<class... Args>
auto operator()(Args&&...) &
-> decltype(!declval<invoke_result_t<FD&, Args...>>());
template<class... Args>
auto operator()(Args&&...) const&
-> decltype(!declval<invoke_result_t<const FD&, Args...>>());
template<class... Args>
auto operator()(Args&&...) &&
-> decltype(!declval<invoke_result_t<FD, Args...>>());
template<class... Args>
auto operator()(Args&&...) const&&
-> decltype(!declval<invoke_result_t<const FD, Args...>>());
};
explicit call_wrapper(F&& f);
Requires: FD shall satisfy the requirements of MoveConstructible. is_constructible_v<FD, F> shall be true. fd shall be a callable object.
Effects: Initializes fd from std::forward<F>(f).
Throws: Any exception thrown by construction of fd.
template<class... Args> auto operator()(Args&&... args) & -> decltype(!declval<invoke_result_t<FD&, Args...>>()); template<class... Args> auto operator()(Args&&... args) const& -> decltype(!declval<invoke_result_t<const FD&, Args...>>());
Effects: Equivalent to:
return !INVOKE(fd, std::forward<Args>(args)...);
template<class... Args> auto operator()(Args&&... args) && -> decltype(!declval<invoke_result_t<FD, Args...>>()); template<class... Args> auto operator()(Args&&... args) const&& -> decltype(!declval<invoke_result_t<const FD, Args...>>());
Effects: Equivalent to:
return !INVOKE(std::move(fd), std::forward<Args>(args)...);
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