#### cancellation_slot_binder::operator()

Forwarding function call operator.

    template<
        typename... Args>
    result_of_t< T(Args...)> operator()(
        Args &&... args);
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    template<
        typename... Args>
    result_of_t< T(Args...)> operator()(
        Args &&... args);
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    template<
        typename... Args>
    result_of_t< T(Args...)> operator()(
        Args &&... args) const;
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