declaring non-template friend functions

[curious2007]

Hello everybody,

When I try to declare nontemplate friend functions I get the following warning:

[warning] friend decleration......declares a non-template function
[warning] (if this is not what you intended, make sure the function tempate has already been declared and add<> after the function name here)-Wno-non-template-friend disables this warning.

Since declaring a non-template friend function is what i have intended, I would like to disable this warning. But I do not know how to do this. Where in my program am i going to write "-Wno-non-template-friend"?

[weaknessforcats]

You need an explicit specializtion of your template:

template <class T>
void MyFunc(T& arg)
{
   //etc
}
 
template<> void MyFunc(string& in);  //explicit specialization
 

The explicit specialization tells the compiler to not use the template if the T is a string. That is, it means you have coded a non-template function because the template won't work if T is a string.

Try not to make warnings go away. If the compiler thinks there's a problem, then, almost certainly, there is a problem.

None of this has anything to do with whethe the function is a friend or not.