1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#pragma pack(1) // tells compiler not to add padding to struct object fields.
typedef union {
int as_int; // 4 bytes on our platform
char* as_string; // 8 bytes on our platform
} IntOrString; // 8 bytes on our platform (max size of its fields)
int main(int argc, char* argv[]) {
IntOrString int_union_object = { .as_int = 32768 };
printf("sizeof(int_union_object) == %zd\n", sizeof(int_union_object));
IntOrString string_union_object = { .as_string = "" };
printf("sizeof(string_union_object) == %zd\n", sizeof(string_union_object));
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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