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Determine if a type meets the Fields named requirements.
        Defined in header <boost/beast/http/type_traits.hpp>
      
template< class T> using is_fields = see-below;
        This alias template is std::true_type
        if T meets the requirements,
        otherwise it is std::false_type.
      
| Type | Description | 
|---|---|
| 
                   | The type to test. | 
        Use with static_assert:
      
template<bool isRequest, class Body, class Fields> void f(message<isRequest, Body, Fields> const&) { static_assert(is_fields<Fields>::value, "Fields type requirements not met"); ...
        Use with std::enable_if (SFINAE):
      
template<bool isRequest, class Body, class Fields> typename std::enable_if<is_fields<Fields>::value>::type f(message<isRequest, Body, Fields> const&);
        Convenience header <boost/beast/http.hpp>