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variadic macros
Splendid Salamander
on Jul 31, 2020
// variadic_macros.cpp
#include <stdio.h>
#define EMPTY
#define CHECK1(x, ...) if (!(x)) { printf(__VA_ARGS__); }
#define CHECK2(x, ...) if ((x)) { printf(__VA_ARGS__); }
#define CHECK3(...) { printf(__VA_ARGS__); }
#define MACRO(s, ...) printf(s, __VA_ARGS__)
int main() {
CHECK1(0, "here %s %s %s", "are", "some", "varargs1(1)\n");
CHECK1(1, "here %s %s %s", "are", "some", "varargs1(2)\n"); // won't print
CHECK2(0, "here %s %s %s", "are", "some", "varargs2(3)\n"); // won't print
CHECK2(1, "here %s %s %s", "are", "some", "varargs2(4)\n");
// always invokes printf in the macro
CHECK3("here %s %s %s", "are", "some", "varargs3(5)\n");
MACRO("hello, world\n");
MACRO("error\n", EMPTY); // would cause error C2059, except VC++
// suppresses the trailing comma
}
Source: docs.microsoft.com
how to call a function in a macro with variadic arguments c++
Splendid Salamander
on Jul 31, 2020
#define eprintf(…) fprintf (stderr, __VA_ARGS__)
Source: gcc.gnu.org
how to call a function in a macro with variadic arguments c++
Splendid Salamander
on Jul 31, 2020
#define eprintf(args…) fprintf (stderr, args)
Source: gcc.gnu.org
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