DBus-cxx supports all DBus types. The following table summarizes the type in C++ and in DBus:

DBus Type(char)	C++ Type
BYTE(`y`)	`uint8_t`
BOOLEAN(`b`)	`boolean`
INT16(`n`)	`int6_t`
UINT16(`q`)	`uint16_t`
INT32(`i`)	`int32_t`
UINT32(`u`)	`uint32_t`
INT64(`x`)	`int64_t`
UINT64(`t`)	`uint64_t`
DOUBLE(`d`)	`double`
STRING(`s`)	`std::string`
OBJECT_PATH(`o`)	DBus::Path
SIGNATURE(`g`)	DBus::Signature
ARRAY(`a`)	`std::vector`
STRUCT(Note 1)	`std::tuple`
VARIANT(`v`)	DBus::Variant
DICT_ENTRY(Note 2)	`std::map`
UNIX_FD(`h`)	DBus::FileDescriptor

Note 1: Structs use () on the bus as their signature - meaining (i) is a struct containing one INT32, (dib) is a struct containing a DOUBLE, INT32, BOOLEAN.

Note 2: In DBus, dicts are shown as arrays with curly brackets. So a{is} is a map of integers to strings: std::map<int32_t,std::string>