Copy elision for pass-by-value arguments

Question

Given

struct Range{
    Range(double from, double to) : from(from), to(to) {}
    double from;
    double to;
};

struct Box{
    Box(Range x, Range y) : x(x         


        

Answer 1

The fact that it can, doesn't mean it most certainly will. See it in this Demo, it's obvious you are creating two copies. Hint, the output contains twice :

copy made

copy made