Re: template template arguments: expected a class template, got `Component<T1, T2, T3>

gary.bernstein@gmail.com wrote:


....


do you mean to be passing a reference or a pointer ?


Even though Component is an appropriate template, the compiler (rightly
or wrongly (i'm not sure) is interpreting Component as the specialized
type in this context. BTW - this is a pointer no a reference.

....

Here is code that compiles - not sure if it does what you want. Note
that <: has special meaning in C++ (look up digraph) so make sure you
leave a space between < and ::.

#include <iostream>
#include <string>

using namespace std;

class Shutdown
{
    virtual void begin()
    {
       cout << "shutdown" << endl;
       exit(0);
    }
};

Shutdown *gs;

template <template <class, class, class> class
Calling_Component, class T1, class T2, class T3>
class MyShutdown : public Shutdown
{
    typedef Calling_Component<T1, T2, T3> Caller;

    Caller& mCaller;

    public:
       MyShutdown(Caller& rCaller)
          : mCaller(rCaller)
       {
       }

       void begin()
       {
          cout << "MyShutdown caller # " << mCaller.mnId << endl;
          exit(0);
       }
};

template <typename T1, typename T2, typename T3>
class Component
{
    public:

       Component(int n)
          : mnId(n)
       {
          gs = new MyShutdown</* space */::Component, T1, T2, T3>(*this);
       }

       int mnId;
};

//} //namespace XX

int main()
{
    Component<int, int, string> c(5);

    MyShutdown< Component, int, int, string> s(c);

    s.begin();
}