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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Jul 31, 2001

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Using a Template Member Function


An ordinary class may have template member functions. In the following example, the class A declares a template member function called f():
 
class A
{
public:
 template <class T> T f(T t);
};

You may define the template member function inside the class body, as in:
 
class A
{
public:
 template <class T> T f(T t) { return t;}
};

Alternatively, you may define it outside the class body. It's advisable to define the template member function in the same file that contains the class declaration:
 
class A
{
public:
 template <class T> T f(T t); // declaration
};

template <class T> T A::f(T t) // definition
{
 return t;
}

You call the template member as follows:
 
A a;
int num=a.f(5);
Danny Kalev
 
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