使用C ++模板的错误C2955和错误C2244

Question

I'm starting learning C++ template. Now, I'm trying to compile the simple example of C++ template.

#include <iostream.h>
template <class T> class pair1 {
     T value1, value2;
public:
    pair1 (T first, T second) {
        value1=first;
        value2=second;
    }
    T getmax ();
};

template <class T> 
T pair1::getmax (){
     T retval;
    retval = value1>value2? value1 : value2;
    return retval;
}
int main(){
     pair1<int> myobject (100, 75);
    cout << myobject.getmax()<<endl;
system("pause");
return 0;
}

I occured the following 2 errors:

• (1) error C2955: 'pair1':use of template requires template argument list
• (2) error C2244:'pair1::getmax':unable to match function definition to an existing declaration

I'm using the Visual Studio 2010.

When use inline function as following, it worked fined:

#include <iostream.h>
template <class T> class pair1 {
     T value1, value2;
public:
    pair1 (T first, T second) {
        value1=first;
        value2=second;
    }
   **T getmax (){ T retval;
retval = value1>value2? value1 : value2;
return retval;};**
};


int main(){
     pair1<int> myobject (100, 75);
    cout << myobject.getmax()<<endl;
system("pause");
return 0;
}

However, i prefer not using inline function in this situation, hope anyone can tell what's wrong with the first block of C++ template code.

Answer 1

You should use template parameter for class.

template <class T> 
T pair1<T>::getmax (){
     T retval;
    retval = value1>value2? value1 : value2;
    return retval;
}