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 36 37 38 39 40 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
// anonymous struct inside typedef to further simplify
typedef struct {
union {
char* as_string;
int as_int;
}; // C11 feature: unions don't need a name in structs
enum {
TYPE_STRING,
TYPE_INT
} type;
} IntOrString;
void print_int_or_string(IntOrString ios) {
if (ios.type == TYPE_STRING) {
printf("ios.as_string == %s\n", ios.as_string);
} else if (ios.type == TYPE_INT) {
printf("ios.as_int == %d\n", ios.as_int);
}
}
int main(int argc, char* argv[]) {
IntOrString five = {
.as_int = 5,
.type = TYPE_INT
};
print_int_or_string(five);
five.as_string = "five";
five.type = TYPE_STRING;
print_int_or_string(five);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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