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Determine if T can be treated
like null during conversions.
Defined in header <boost/json/conversion.hpp>
template< class T> struct is_null_like : public false_type
Primary template instantiations provide the member constant value that is equal to false.
Users can specialize the trait for their own types if they do
want them to be treated as nulls. For example:
namespace boost { namespace json { template <> struct is_null_like<your::null_type> : std::true_type { }; } // namespace boost } // namespace json
Convenience header <boost/json.hpp>