Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Function call operator.

template<
    typename... Args>
auto operator()(
    Args &&... args);

Invokes target completion handler with the supplied arguments.

This function may only be called once, as the target handler is moved from. The polymorphic wrapper is left in an empty state.

Throws std::bad_function_call if the polymorphic wrapper is empty.