Vector iterators incompatible
Hello,
First, let me state that I have solved the issue that was giving me the VC++ debug assertion: "Expression: vector iterators incompatible". It's just that I'm not exactly how my change made a difference.
I have a 2-d array template class which as its only member has a vector-of-vectors. An abbreviated version is shown below:
Code:
template <class T>
class vector2
{
protected:
vector<vector<T> > elements;
public:
vector2();
vector2(unsigned rows, unsigned columns);
vector2(unsigned rows, unsigned columns, const T& value);
vector2(const vector2<T>& other);
//Overloaded operators
vector2<T>& operator=(const vector2<T>& other);
vector<T>& operator[] (unsigned index);
vector<T> operator[] (unsigned index) const;
// ...other member methods...
};
The problem occurred in the implementation of the copy constructor body:
Code:
template <class T>
vector2<T>::vector2(const vector2<T>& other) :
elements(other.elements)
{
}
...which usually worked, but I subsequently changed it to:
Code:
template <class T>
vector2<T>::vector2(const vector2<T>& other)
{
elements = other.elements;
}
...and VC++ no longer asserted. Thus, it appears the incompatible vector iterators has something to do copy-constructing a std::vector-of-std::vectors, rather than using the assignment operator. Can anyone explain why exactly this occurs? I'm not a newbie but I'm also not an expert, so this might be a little beyond my current understanding. Normally, using the copy constructor works just fine - each vector-of-vector elements are always copied as I expect. It's just this specific assertion that I've never run into before.
Thanks in advance!
