Point and Rect optimizations

[ghost]

I noticed Point and Rect both make use of constexpr, but do not make use of r-value references. This allows for optimizations when the Point and Rect are known at compile time, but leads to suboptimal performance when they are not.

Using non-friend, non-member operators (while tedious) could lead to a substantial performance boost, as could using r-value this member operators (a bit esoteric), or C++14 style constexpr (as C++11 style constexpr cannot use r-values, but C++14 style can), or some mix of these techniques.

I'd be willing to implement any of these solutions, just looking for guidance on which is most acceptable.

[AMDmi3]

Could you please alaborate? I cannot see any use for r-value refs with POD types.