ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/cmd/cpp/test.c/
#define NOP(x) x #define CAT(a, b) a ## b #define EOF (-1) x NOP(CAT(foo, EOF)) y x NOP(CAT(EOF, foo)) y x CAT(, EOF) y y CAT(foo,) x x CAT(,foo) y X NOP(CAT(,)) y #define NCAT(a) foo ## a NCAT(bar) #define XCAT(a) ## a foo XCAT(bar) #define CAT3(foo) a##foo##b CAT3(blah) #define BAR 3 #define FOO CAT(BAR, 3) FOO /* Expected: a bc d */ CAT(a b, c d) /* * CURRENTLY BROKEN: * __VA_ARGS__ requires at least one item. * It should accept an empty list. #define xprint(a, ...) print(a, __VA_ARGS__) xprint("hi", "there") xprint("hi") */ #define C a,b #define X(a) a #define Y X(C) Y #define x 3 #define f(a) f(x * (a)) #undef x #define x 2 #define g f #define z z[0] #define h g(~ #define m(a) a(w) #define w 0,1 #define t(a) a #define p() int #define q(x) x #define r(x,y) x ## y #define str(x) # x f(y+1) + f(f(z)) % t(t(g)(0) + t)(1); g(x+(3,4)-w) | h 5) & m (f)^m(m); /* * CURRENTLY BROKEN: * mac() needs at least one argument. * It should treat no args as a single empty arg list. p() i[q()] = { q(1), r(2,3), r(4,), r(,5), r(,) }; char c[2][6] = { str(hello), str() }; */