osrm-backend/third_party/protozero/doc/cheatsheet.md

Protozero Cheat Sheet

See also this handy table from the Google Protocol Buffers documentation.

Scalar types

PBF Type	Underlying Storage	C++ Type	Getter	Notes
int32	varint	int32_t	get_int32()
sint32	varint (zigzag)	int32_t	get_sint32()
uint32	varint	uint32_t	get_uint32()
int64	varint	int64_t	get_int64()
sint64	varint (zigzag)	int64_t	get_sint64()
uint64	varint	uint64_t	get_uint64()
bool	varint	bool	get_bool()
enum	varint	int32_t	get_enum()
fixed32	32bit fixed	uint32_t	get_fixed32()
sfixed32	32bit fixed	int32_t	get_sfixed32()
fixed64	64bit fixed	uint64_t	get_fixed64()
sfixed64	64bit fixed	int64_t	get_sfixed64()
float	32bit fixed	float	get_float()
double	64bit fixed	double	get_double()
string	length-delimited	data_view	get_view()	(1)
string	length-delimited	pair	get_data()	(2)
string	length-delimited	std::string	get_string()
bytes	length-delimited	data_view	get_view()	(1)
bytes	length-delimited	pair	get_data()	(2)
bytes	length-delimited	std::string	get_bytes()
message	length-delimited	data_view	get_view()	(1)
message	length-delimited	pair	get_data()	(2)
message	length-delimited	pbf_reader	get_message()

Notes:

• (1) preferred form, returns protozero::data_view which is convertible to std::string if needed.
• (2) deprecated form, returns std::pair<const char*, pbf_length_type>, use get_view() instead. This form is only available if PROTOZERO_STRICT_API is not defined.
• The setter function of pbf_writer is always add_ + the PBF type. Several overloads are available.

Packed repeated fields

PBF Type	Getter
int32	get_packed_int32()
sint32	get_packed_sint32()
uint32	get_packed_uint32()
int64	get_packed_int64()
sint64	get_packed_sint64()
uint64	get_packed_uint64()
bool	get_packed_bool()
enum	get_packed_enum()
fixed32	get_packed_fixed32()
sfixed32	get_packed_sfixed32()
fixed64	get_packed_fixed64()
sfixed64	get_packed_sfixed64()
float	get_packed_float()
double	get_packed_double()

Packed repeated fields for string, bytes, and message types are not possible.