How to copy the behavior of a type passed as a class template argument?

Question

C++ / C#

There is a conditional class MagicClass
. It can copy the behavior of the type passed to it by the template argument:

MagicClass<int>          some_var = 13;
MagicClass<std::string>  another_var = "Some Text";
MagicClass<AnotherClass> yet_another_var = /*Some magic*/;

How to implement such a class?
UPD: It should not only copy the = operator

SomeClass<int> some_var = 12;
some_var++;
some_var *= (11 + 11);

Answer 1

Define a constructor with a template type for it.