Help in template

[manjuks]

Hi,

Please see below a peice of code

template<class T> void swap(T &a, T &b)
{
        T temp;
        temp = a;
        a = b;
        b = temp;
}
 

Here I am getting an error as below
template.cpp:26: error: call of overloaded swap(int&, int&)â is ambiguous

I dont know what is the problem with swap?

If i define template as as template<class T> void swapa(T &a, T &b) It will work fine. Please help to resolve this.

Thanks
Manjunath

[Banfa]

Is there a function with the prototype swap(int&, int&) defined elsewhere in your code?

For instance have you included <algorithm>?

[manjuks]

I didn't include algorithm. I didn't define swap(int&, int&) too. If I define this one, it should work properly without any error as for as my knowledge.
Correct me if I am wrong.

Thanks,
Manjunath

[Banfa]

Well the compiler error means that you have attempted to call swap in a context where it has more than one option of which function to call and no way to resolve which one it should use perhaps you could post the code that is creating the error.

[manjuks]

Please go through the code and help me out in getting out of that error

#include<iostream>
using namespace std;

template<class T> void swap(T &a, T &b)
{
T temp;
temp = a;
a = b;
b = temp;
}


int main()
{
int a = 100, b = 200;
cout<<"Before swapping"<<endl;
cout<<"a = "<<a<<" "<<"b = "<<b<<endl;
swap(a, b);
cout<<"After swapping"<<endl;
cout<<"a = "<<a<<" "<<"b = "<<b<<endl;
return 0;
}

Thanks,
Manjunath

[newb16]

main.cpp:18: error: call of overloaded `swap(int&, int&)' is ambiguous
main.cpp:5: error: candidates are: void swap(T&, T&) [with T = int]
/usr/include/c++/3.3.3/bits/stl_algobase.h:121: error: void
>std::swap(_Tp&, _Tp&) [with _Tp = int]

Because iostream included algorithm.
Either dump 'using namespace std' from your program, place your template in some other namespace or rename it.

[manjuks]

Ok Thanks for your help Banfa and newb16,

Now I understood whats the problem.

Thanks Once again,
--Manjunath