メモリ配置とキャスト – wizaman's blog

実際に確認してみます。 #include <cstdio> #define PRINT_OBJ(obj) \ printf("%-10s: %08x, %-16s: %2d\n",\ "&"#obj,\ 0,\ "sizeof("#obj")",\ sizeof(obj)); #define PRINT_FIELD(obj, field) \ printf("%-10s: %08x, %-16s: %2d\n",\ "&"#obj"."#field,\ value(&obj.field) - value(&obj),\ "sizeof("#obj"."#field")",\ sizeof(obj.field)); namespace { class Base { public: int a; short b; float c; char d; }; class Sub : public B