1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
typedef struct {
enum { ELEMENT_INT, ELEMENT_STRING } type;
union {
int as_int;
char* as_string;
}; // ANONYMOUS union (C11).
} Element;
void print_element_simple(Element element) {
if(element.type == ELEMENT_INT) {
printf("element.as_int == %d\n", element.as_int);
}
else if(element.type == ELEMENT_STRING) {
printf("element.as_string == \"%s\"\n", element.as_string);
}
}
int main(int argc, char* argv[]) {
Element element1 = { .type = ELEMENT_INT,
.as_int = 5 }; // do not attempt to initialize .as_int and .as_string in the same object
print_element_simple(element1);
Element element2 = { .type = ELEMENT_STRING,
.as_string = "Pithus" };
print_element_simple(element2);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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