|  | 
        A type trait that determines the result type of a require
        expression.
      
template< typename T, typename... Properties> struct require_result
| Name | Description | 
|---|---|
| The result of the require expression. | 
        Class template require_result
        is a trait that determines the result type of the expression asio::require(std::declval<T>(),
        std::declval<Properties>()...).
      
        Header: asio/require.hpp
      
        Convenience header: asio.hpp