CODEWITHSUNDEEP
c++
Joe Caraccio
Joe Caraccio

Reputation: 2035

Define and use private methods not in header file

I have a situation where I am not allowed to modify the header file for my class. I want to add just a helper function to use with one of my functions.. but cant quite figure out the correct way to implement it. Normally I try google but couldn't find any help on there.

Here is my current code:

    template<typename T>
void Set<T>::doubleRotateRight(Elem *& node) {
    // you fill in here
    rotateRight(node->left);
    rotateLeft(node);

    //call private helper not defined in header
    privmed();

}
void privmed(){
    //out << "who" << endl;
}

However, when I run this I get the error:

error: there are no arguments to ‘privmed’ that depend on a template parameter, so a declaration of ‘privmed’ must be available [-fpermissive]
     privmed();

Any help with this would be incredible!

Upvotes: 0

Views: 528

Answers (2)

Daniel Illescas
Daniel Illescas

Reputation: 6166

I think the problem is that you have to define the "privmed()" function before you use it, like this:

void privmed(){
    //out << "who" << endl;
}

template<typename T>
void Set<T>::doubleRotateRight(Elem *& node) {
    // you fill in here
    rotateRight(node->left);
    rotateLeft(node);

    //call private helper not defined in header
    privmed();
}

Upvotes: 1

Cheers and hth. - Alf
Cheers and hth. - Alf

Reputation: 145457

You can just use a lambda:

template<typename T>
void Set<T>::doubleRotateRight(Elem *& node)
{
    static auto const privmed = []() -> void 
    {
        //out << "who" << endl;
    };

    // you fill in here
    rotateRight(node->left);
    rotateLeft(node);

    //call private helper not defined in header
    privmed();
}

Upvotes: 1

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