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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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