#### experimental::wait_for_one_success::operator()

    constexpr cancellation_type_t operator()() const;
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    template<
        typename E,
        typename... Args>
    constexpr constraint_t<!is_disposition< E >::value, cancellation_type_t > operator()(
        const E & ,
        Args && ...) const;
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    template<
        typename E,
        typename... Args>
    constexpr constraint_t< is_disposition< E >::value, cancellation_type_t > operator()(
        const E & e,
        Args && ...) const;
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