Question

template <class T>
class Test
{
public:
 template<class T>
 void f();  //If i define function here itself, error is not reported.
};

template <class T>
void Test<T>::f() 
{
}              //Error here.

int main()
{
 Test<float> ob;
 ob.f<int>();
}

它产生以下错误。

error C2244:  Test<T>::f  : unable to match function definition to an
existing declaration

definition void Test::f(void)
existing declarations void Test::f(void)

Error says declaration and definitions have the same prototype but not matching. Why is this an error ? and how to solve it ?

If i define function within the class, it doesn t report error. But i want to define outside the class.

Answer 1

更改为

template <class T> 
class Test 
{ 
public: 
 template<class U> 
 void f(); 
}; 

template <class T> 
template<class U>
void Test<T>::f()  
{ 
}

Answer 2

....
public:
  template<class T> // this shadows the previous declaration of typename T
   void f();  
};

更改参数名称这里是工作代码。

友情链接