mem padding

padding.cpp

#include <iostream>

union data {
        struct gg_t {
                char a;
                char b;
                int c;
        } gg;

        struct yy_t {
                char a;
                int b;
                char c;
        } yy;
};

int main(int argc, const char *argv[])
{
        data aaa;

        aaa.yy.a = 'c';
        aaa.yy.b = 'c';
        aaa.yy.c = 'c';

        std::cout << "sizeof data: " << sizeof(data) << std::endl;

        return 0;
}