variant_category
Conversion category for variants.
Synopsis
Defined in header <boost/json/conversion.hpp>.
using variant_category = std::integral_constant< conversion_category, conversion_category::variant >;Description
Variants are serialized the same way their active alternative is serialized. The opposite conversion selects the first alternative for which conversion succeeds.
By default a type T is considered a variant if given t, a glvalue of type const T, t.valueless_by_exception() is well-formed.
Users can specialize conversion_category_of for their own types if they want them to be treated as variants. For example:
namespace boost { namespace json {
template <>
struct conversion_category_of<your::variant> : variant_category
{ };
} }Mathcing Types
Convenience header <boost/json.hpp>.