template-id does not match any template declaration

template-id does not match any template declaration

[learning c++]

Hi,
I am a novice for C++, and I compiled a program with C++ and there are an 
error, Pleaes help me.

Thanks,

#include <iostream>

template <class T>
class pair {
    T value1, value2;
  public:
    pair (T first, T second)
      {value1=first; value2=second;}
    T module () {return 0;}
};

template <>
class pair <int> {
    int value1, value2;
  public:
    pair (int first, int second)
      {value1=first; value2=second;}
    int module ();
};

template <>
int pair<int>::module() {
  return value1%value2;
}
int main () {
  pair <int> myints (100,75);
  pair <float> myfloats (100.0,75.0);
  std::cout << myints.module() << '\n';
  std::cout << myfloats.module() << '\n';
  return 0;
}

Error:
templatemodule1.cpp:22: error: template-id `module<>' for `int
   pair<int>::module()' does not match any template declaration
templatemodule1.cpp:22: error: syntax error before `{' token

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Re: template-id does not match any template declaration

[Arno Wilhelm]

> I am a novice for C++, and I compiled a program with C++ and there are an 
> error, Pleaes help me.

Try this:


      1 #include <iostream>
      2
      3
      4 template <class T>
      5 class pair
      6 {
      7 public:
      8     pair(T first, T second) {value1=first; value2=second;}
      9     T module () {return 0;}
     10
     11 private:
     12     T value1;
     13     T value2;
     14 };
     16
     17 template <>
     18 class pair <int>
     19 {
     20 public:
     21     pair (int first, int second) {value1=first; value2=second;}
     22     int module (  ) { return (value1 % value2); }
     23 private:
     24     int value1;
     25     int value2;
     26 };
     35
     36 int main (void)
     37 {
     38     pair <int>   myints (100, 75);
     39     pair <float> myfloats (100.0, 75.0);
     40
     41     std::cout << myints.module() << '\n';
     42     std::cout << myfloats.module() << '\n';
     43
     44 return 0;
     45 }
     46


Arno






> Thanks,
> 
> #include <iostream>
> 
> template <class T>
> class pair {
>     T value1, value2;
>   public:
>     pair (T first, T second)
>       {value1=first; value2=second;}
>     T module () {return 0;}
> };
> 
> template <>
> class pair <int> {
>     int value1, value2;
>   public:
>     pair (int first, int second)
>       {value1=first; value2=second;}
>     int module ();
> };
> 
> template <>
> int pair<int>::module() {
>   return value1%value2;
> }
> int main () {
>   pair <int> myints (100,75);
>   pair <float> myfloats (100.0,75.0);
>   std::cout << myints.module() << '\n';
>   std::cout << myfloats.module() << '\n';
>   return 0;
> }
> 
> Error:
> templatemodule1.cpp:22: error: template-id `module<>' for `int
>    pair<int>::module()' does not match any template declaration
> templatemodule1.cpp:22: error: syntax error before `{' token
> 
> _________________________________________________________________
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-- 
Arno Wilhelm <arno.wilhelm@profile.co.at>
proFILE Computersysteme GmbH

Re: template-id does not match any template declaration

[Eljay Love-Jensen]

Hi,

You were almost there!  Just a little syntax tweak for your separate 
definition of your member function of your explicit template specialization 
for pair<int>::module.  (See below.)

Also, I changed the return statement on your general pair template 
pair::module to something more suitable.

Caution, there is a std::pair.  Your ::pair is okay, but could be a little 
better protected by putting your pair class in your own namespace.  Or, 
make sure you never do a "using namespace std" anywhere (I disparage 
"pulling in the std uberverse namespace" on general principle).

HTH,
--Eljay

-------------------------------
#include <iostream>
using std::cout;

template <class T>
class pair
{
     T value1;
     T value2;
public:
     pair(T first, T second)
     {
         value1 = first;
         value2 = second;
     }
     T module()
     {
         return T();
     }
};

template <>
class pair<int>
{
     int value1;
     int value2;
public:
     pair(int first, int second)
     {
         value1 = first;
         value2 = second;
     }
     int module();
};

int pair<int>::module()
{
     return value1 % value2;
}

int main()
{
     pair<int> myints(100, 75);
     pair<float> myfloats(100.0, 75.0);
     cout << myints.module() << '\n';
     cout << myfloats.module() << '\n';
}