类模板仅适用于2种类型

Question

编写仅对2种类型有意义的类模板（即float和double ）有什么优点（除了可维护性）？

Answer 1

Maintainability is the one single advantage, you want to keep your code DRY (Don't Repeat Yourself) without duplicated code.

I don't see any problems with a template for just two types - float and double are similiar, but there are no other types that behave in the same way.

Answer 2

Because it may be applicable to use std::complex<float> as a type? It the template is really generic to a floating point (or integer) type, who said that there may not come additional larger types along the road?