Suppose I have a class Heap that represents a binary heap in an array. Then
suppose that I have another class called Heap::iterator that moves down the
heap to the left or the right. Here is the code from the header file
describing these two types:
--- CODE ---
class Heap
{
std::vector<int > m_vec;
public:
class iterator {
protected:
Heap *m_heap;
int m_position;
public:
enum Direction {LEFT, RIGHT};
iterator(Heap &myHeap, int position = 0);
iterator(const iterator &other);
int &operator *();
iterator left() const;
iterator right() const;
iterator child(const Direction &dir);
void walk(const Direction &dir);
};
Heap(int depth);
int &operator [](unsigned int index);
const int &operator [](unsigned int index) const;
iterator top();
void write(std::ostr eam &o) const;
};
--- CODE ---
This is not compilable code. How would you recommend that I implement a
const_iterator while reusing code and not just copy and pasting method
bodies?
Thanks,
JFA1 2 3928
On 2005-03-28, James Aguilar <jf**@cec.wustl .edu> wrote: Suppose I have a class Heap that represents a binary heap in an array. Then suppose that I have another class called Heap::iterator that moves down the heap to the left or the right. Here is the code from the header file describing these two types:
[snip] This is not compilable code.
Why not ? It would make it easier to address the issue if you'd say why.
How would you recommend that I implement a const_iterator while reusing code and not just copy and pasting method bodies?
The same way you always use when you want to write the same code for different
types: templates.
Make a templated version of an iterator, have one with non-const template
parameters and one where you use const. You may need more than one template
argument. Then make iterator and const_iterator typedefs. e.g. iterator
could be iter<T,T*> and const_iterator could be iter<T, const T*>
Cheers,
--
Donovan Rebbechi http://pegasus.rutgers.edu/~elflord/
"Donovan Rebbechi" <ab***@aol.co m> wrote in message
news:sl******** **********@pani x2.panix.com... Why not ? It would make it easier to address the issue if you'd say why.
I didn't think it would be necessary.
The same way you always use when you want to write the same code for different types: templates.
Make a templated version of an iterator, have one with non-const template parameters and one where you use const. You may need more than one template argument. Then make iterator and const_iterator typedefs. e.g. iterator could be iter<T,T*> and const_iterator could be iter<T, const T*>
And it seems it wasn't! This is very helpful! Now, why didn't I think of
that . . .
- JFA1 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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