Using enum as template type argument in C++

Question

are there any restrictions / problems using an enum as template (type) argument in C++?

Example:

enum MyEnum
{
    A, B, C, D, E
};

template 

        

Answer 1

Yes, there are restrictions. For example, you cannot use an anonymous enum as a template argument according to C++03 14.3.1[temp.arg.type]/2

A local type, a type with no linkage, an unnamed type or a type compounded from any of these types shall not be used as a template-argument for a template type-parameter.

So the following code is not valid in C++03:

template 
void f(T) {}

enum {A};

int main() {
  f(A);
}

It is valid in C++11 though.