[GRASS-dev] __BEGIN_DECLS

[Glynn Clements]

John Gillette wrote:

> In lib/vector/dglib/graph.h  there is __BEGIN_DECLS (near top) and
> __END_DECLS (at bottom).
> 
> Are these needed?

No.

> What do they do?

They are defined like so in type.h:

	#ifdef __cplusplus
	# define __BEGIN_DECLS extern "C" {
	# define __END_DECLS }
	#else
	# define __BEGIN_DECLS /* empty */
	# define __END_DECLS /* empty */
	#endif

Essentially, they allow the header to be used in C++ code. As the
rest of GRASS doesn't do this, there doesn't seem much point doing it
in a few specific headers.

-- 
Glynn Clements <glynn at gclements.plus.com>