18 #define F(x, y) x + y   macro
21 1: ELLIP_FUNC(F, LPAREN, 'a', 'b', RPAREN); 
22 2: ELLIP_FUNC(F LPAREN 'a', 'b' RPAREN); 
23 #undef F
29 #define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)  macro
30 3: F(a, b, c) // replaced by f(0, a, b, c) 
31 4: F() // replaced by f(0)
35 #undef F
53 #define F(x, ...) HT_ ## __VA_OPT__(x x A()  #x)  macro
55 8: F(1)
56 9: F(A(),1)
61 #undef F
63 #define F(a,...) #__VA_OPT__(A1 a)  macro
65 10: F(A())
66 11: F(A1 A(), 1)
69 #undef F
72 #define F(a,...) a ## __VA_OPT__(A1 a) ## __VA_ARGS__ ## a  macro
73 12.0: F()
74 12: F(,)
75 13: F(B,)
79 #undef F
81 #define F(...) #__VA_OPT__()  X ## __VA_OPT__()  #__VA_OPT__(        )  macro
83 14: F()
84 15: F(1)
89 #undef F
100 #define F(a,...) A() #__VA_OPT__(A3 __VA_ARGS__ a ## __VA_ARGS__ ## a ## C A3) A()  macro
102 18: F()
103 19: F(,)
104 20: F(,A3)
105 21: F(A3, A(),A0)
113 #undef F
115 #define F(a,...) A() #__VA_OPT__(A3 __VA_ARGS__ a ## __VA_ARGS__ ## a ## C A3) a __VA_OPT__(A0 __VA…  macro
117 22: F()
118 23: F(,)
119 24: F(,A0)
120 25: F(A0, A(),A0)
128 #undef F
130 #define F(a,...)  __VA_OPT__(B a ## a) ## 1  macro
132 26: F(,1)
136 #undef F
139 #define F(a,...)  B ## __VA_OPT__(a 1) ## 1  macro
142 27: F(,1)
143 27_1: F(A0,1)
149 #undef F