VS Compatibility

[pmor13]

To make REPEAT macro compatible with VS2010:

#define EXPAND__( x ) x
#define CHECK(...) EXPAND__(CHECK_N(__VA_ARGS__, 0,))
#define NOT(x) CHECK(EXPAND__(PRIMITIVE_CAT(NOT_, x)))

[pfultz2]

The goal is to target C preprocessors, not to show bugs in poorly implemented preprocessors. Your workaround could cause unintended extra scans to macros, perhaps even on MSVC(as their preprocessor doesn't work in a sane way).

[MarcusJohnson91]

Not really relevant anymore with MSVC's conformant preprocessor