sks_cpp wrote:
> template<typename A, typename B, typename C> void determineType(A, B, C)
> {
>     determine(A);  // It doesn't allow me to do this ?? why ??
> }


"A" in Your case is a type and not a variable.

What You need to do is:

template<typename A, typename B, typename C> void determineType(A a, B, C)
{
     determine(a);  // Use variable instead of type.
}


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#include <iostream>

using namespace std;

template< typename A > void determine( A )
{
    cout << "Not an int or a double\n";
}
template<> void determine<int>( int a )
{
    cout << "It's an int\n";
}
template<> void determine<double>( double a )
{
    cout << "It's a double\n";
}
template<typename A, typename B, typename C> void determineType(A, B, C)
{
    determine(A);  // It doesn't allow me to do this ?? why ??
}


int main()
{
    int a = 1;
    double b = 2.0;
    char c = 'a';

    determine(a);  // works fine
    determine(b);  // works fine
    determine(c);  // works fine

    determineType(a,b,c);  // doesn't work ??

 return 0;
}




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