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In C, what does a word preceded by two underscores mean? I've seen this used for starting inline Assembly code and I've also seen __BEGIN_DECLS and __END_DECLS in standard header files. What are these directives used for, generally speaking?
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#1
Posted 07 September 2011 - 07:56 PM
DarkLordofthePenguins
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#2
Posted 07 September 2011 - 08:23 PM
Alexander
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In a general (only recommended) effort to keep names from collision, single underscores denote library identifiers, i.e.
Two underscores (at least put in paper in ISO:14882:'98 C++), even in any part of the identifier, denotes a vendor defined identifier.
Alexander.
_exit(0); _internal_foo(2);
Two underscores (at least put in paper in ISO:14882:'98 C++), even in any part of the identifier, denotes a vendor defined identifier.
__FILE__ __LINUX__ __CLR_VER (vendor as MSVC) __FGETS_UNLOCKED (vendor as gcc)
Alexander.
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