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Showing content from https://timsong-cpp.github.io/cppwp/n4140/func.wrap.func.inv below:

[func.wrap.func.inv]

20.9.11.2.4 function invocation [func.wrap.func.inv]

R operator()(ArgTypes... args) const

1

Effects: INVOKE(f, std::forward<ArgTypes>(args)..., R) ([func.require]), where f is the target object ([func.def]) of *this.

2

Returns: Nothing if R is void, otherwise the return value of INVOKE(f, std::forward<ArgTypes>(args)..., R).

3

Throws: bad_function_call if !*this; otherwise, any exception thrown by the wrapped callable object.

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