Question

(I have just answered this question after searching for a while, so I am asking and answering this question here for it to be here when it’s needed. There are similar, but not quite the same, questions.)

Answer 1

Cast it to int. This can be consumed by a stringstream or otherwise converted for string use.

Where colour was a struct SDL_Color containing Uint8 (a defined alias for uint8_t) members, the solution was

stringstream ss << "[colour=" << (int)colour.r << ", " << (int)colour.g << ", " << (int)colour.b << "; light=" << light << "]";