Constructors, templates and non-type parameters

Question

I\'ve a class that must depend for some reasons from an int template parameter.
For the same reasons, that parameter cannot be part of the parameter list fo

Answer 1

use template specialization and inheritance:

#include 
using namespace std;

template  struct A {
    A() { cout << "generic" << endl; }
};

template <> struct A<1> {
    A() { cout << "implementation of 1" << endl; }
};

template 
struct B : public A {
    B() : A() {}
};

int main(int argc, char *argv[])
{
    B<1> b;
    B<3> b1;
    B<4> b2;
}

edit: or you can do it even easier:

template 
struct A {
    A();
};

template 
A::A() { cout << "general " << num << endl; }

template <>
A<1>::A() { cout << "specialization for 1" << endl; }