Named argument in C99

named_arguments.c

/**
 * \brief Named arguments in C99
 * \author Florian Dupeyron <[email protected]>
 */

#include <stdlib.h>
#include <stdio.h>

struct FooArgs {
	int a;
	int b;
	int c;
};

void foo_impl(struct FooArgs args) {
	printf("Calling foo with a = %d, b = %d, c = %d\n", args.a, args.b, args.c);
}

#define foo(...) foo_impl((struct FooArgs){ __VA_ARGS__})

int main(int argc, char* argv[]) {
	// Calling with struct init
	foo_impl((struct FooArgs){
		.a = 4,
		.b = 12,
		.c = 36
	});

	// Calling with macro
	foo(
		.a = 5,
		.b = 13,
		.c = 37
	);
	return EXIT_SUCCESS;
}