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