Type-punning through unions has defined behaviour in C: typedef union { uint32_t i; float f; } MyUnion; MyUnion u; u.f = 4.2; print("%"PRIu32, u.i); // defined behaviour Given via ...

In C++11, it safe to read/write a fixed size struct to a file, but I couldn't find any reference about is it safe to read/write a union to file. If have following struct and union: struct typeA { ch...

My code: union FIELD { int n; char c; const char *s; FIELD(){} FIELD(int v){ n = v; } FIELD(char v){ c = v; } FIELD(const char* v){ s = v; } }; struct SF { const char*...

I have a union, defined like so: union CellType { std::string str; int i; double d; Money<2> m; // Custom class for fixed-decimal math. }; Then, I have a vector of such unions....