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        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