Need a little syntax help I think

dreamuser · #1 06-Oct-2008, 18:14

I have a templated class something like this:

CPP / C++ / C Code:

template <class ItemType>
class TernaryTree
{
.

.

.
private:

  struct TernaryNode{
    .
    .
  }

  TernaryNode *root;

}

Anyway my question is when I do the following declaration:

TernaryNode * getNodeByElement(. . . )

I do not know the syntax for the implementation... I've tried things like
TernaryNode TernaryTree<ItemType>::*getNodeByElement( . . . )

but nothing has worked so far.

What am I doing wrong here?

ocicat · #2 06-Oct-2008, 19:33

Quote:

Originally Posted by dreamuser

What am I doing wrong here?

It is not clear from the code posted as to where you are trying to access this nested structure. Given that this structure is declared private, it can only be used within the scope of the class. The following example illustrates this point:

CPP / C++ / C Code:

template <class T>
class foo {
    struct bar { } *p;
public:
    bar* f()  { return p; }
    void g();
};

int
main() {
    foo<int> fi;
    fi.g();

    return 0;
}

template <class T>
void
foo<T>::g() {
    foo<T>::bar *p = f();
    bar *q = f();
}

Note that inside member function g(), instances of the nested structure can be defined both implicitly & explicitly. You will not have this latitude if the nested structure is to be accessed publicly. eg.

CPP / C++ / C Code:

template <class T>
class foo {
public:
    struct bar { } *p;
    bar* f()  { return p; }
};

int
main() {
    foo<int> fi;

    foo<int>::bar *p = fi.f();

    return 0;
}

Reply back if you still have questions.

Likewise, when posting code, please place a [cpp] tag before the code, & [/cpp] afterwards. This maintains formating & color codes keywords & identifiers.

dreamuser · #3 06-Oct-2008, 19:51

The function is a private member function of the class.

They are all declared and implemented in a header file and I use the scope operator to connect them like:

CPP / C++ / C Code:

template <class ItemType>
bool TernaryTree<ItemType>::GetStuff()
{
.
.
.
}

I need to know the correct syntax to use implementing

CPP / C++ / C Code:

TernaryNode * getNodeByElement( .. .. )

ocicat · #4 06-Oct-2008, 20:12

Quote:

Originally Posted by dreamuser

I need to know the correct syntax to use implementing

CPP / C++ / C Code:

TernaryNode * getNodeByElement( .. .. )

What in my first example does not answer your question?

dreamuser · #5 06-Oct-2008, 20:24

I am used to implementing functions like this

CPP / C++ / C Code:

template <class ItemType>
bool TernaryTree<ItemType>::DoStuff()
{
.. .. .. 
... . .. 
}

Can you be a little more specific to my situation with your answer?

ocicat · #6 06-Oct-2008, 20:40

Quote:

Originally Posted by dreamuser

Can you be a little more specific to my situation with your answer?

CPP / C++ / C Code:

template <class T>
class TernaryTree {
    struct TernaryNode { } *root;
    TernaryNode* getNodeByElement()  { return root; }
    void f();
public:
    void g();
};

int
main() {
    TernaryTree<int> ti;
    ti.g();

    return 0;
}

template <class T>
void
TernaryTree<T>::f() {
    TernaryTree<T>::TernaryNode *p = getNodeByElement();
    TernaryNode *q = getNodeByElement();
}

template <class T>
void
TernaryTree<T>::g() {
    TernaryTree<T>::TernaryNode *p = getNodeByElement();
    TernaryNode *q = getNodeByElement();
    f();
}

Again, if the member function(s) returning pointers to the nested structure are only used within class scope, the pointer itself can either be explicitly or implicitly typed (note in both examples, the enclosing class does not need to be specified...).

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Need a little syntax help I think

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