111_mapping_dds_types.md

layout	title	permalink	abstract	published	author	date_written	last_modified	categories
default	Mapping between ROS interface types and DDS IDL types	articles/mapping_dds_types.html	This article specifies the mapping between the ROS interface types and the DDS types.	true	[Dirk Thomas](https://github.com/dirk-thomas)	2015-06	2020-02	Interfaces

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With the transition to use ``IDL`` for specifying interfaces in ROS 2 Dashing this article has been superseded by the mapping described in the [Interface definition using .msg / .srv / .action files](legacy_interface_definition.html) article.

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Scope

This article specifies the mapping between ROS interface types defined in the interface definition article and DDS types defined in the Interface Definition Language.

Mapping of primitive types

ROS type	DDS type
bool	boolean
byte	octet
char	char
float32	float
float64	double
int8	octet
uint8	octet
int16	short
uint16	unsigned short
int32	long
uint32	unsigned long
int64	long long
uint64	unsigned long long
string	string

Mapping of arrays and bounded strings

ROS type	DDS type
static array	T[N]
unbounded dynamic array	sequence
bounded dynamic array	sequence<T, N>
bounded string	string