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        Determine if T meets the
        requirements of Fields.
      
        Defined in header <boost/beast/http/type_traits.hpp>
      
template< class T> struct is_fields : public std::integral_constant< bool,...>
| Type | Description | 
|---|---|
| 
                   | The body 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 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>