v2_0_cpp_variant

variant type

What is this?

msgpack-c doesn't have boost::variant adaptor. But msgpack::type::variant can contain any msgpack types. It is implemented using boost::variant. There are two variant types. One is value based msgpack::type::variant, the other is reference based msgpack::type::variant_ref.

Type mapping

In common types msgpack::type::variant and msgpack::type::variant_ref

msgpack::type	variant type
NIL	msgpack::type::nil_t
BOOLEAN	bool
POSITIVE_INTEGER	uint64_t
NEGATIVE_INTEGER	int64_t
FLOAT	double

msgpack::type::variant

msgpack::type	variant type
STR	std::string
BIN	std::vector
EXT	msgpack::type::ext
ARRAY	std::vector<msgpack::type::variant>
MAP	std::multimap<msgpack::type::variant, msgpack::type::variant>

msgpack::type::variant_ref

msgpack::type	variant type
STR	boost::string_ref
BIN	msgpack::type::raw_ref
EXT	msgpack::type::ext_ref
ARRAY	std::vector<msgpack::type::variant_ref>
MAP	std::multimap<msgpack::type::variant, msgpack::type::variant_ref>