Your and functions return a T but you are trying to return a Temps But the normal semantics of and is to return a bool so you may want to return a.
The common pattern to achieve what you want is to actually perform it in the opposite direction: provide an implicit conversion from T to the template and only define the operator for the template.
The issue with your operator+ is you have 3 template parameters, one for the return type as well as the cast, but there is no way for the compiler to automatically resolve that parameter.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.