Iterator accessing problem in vector

[snova]

Hi everyone,

While using iterator in vector template, I am facing compiler error

template <typename T>
class CTest
{
public:
	void Insert(T&	value);
	void Display();
	void Erase(T& value);

private:
	std::vector<T>			myVecContainer;
 	myVecContainer::iterator	myVecItertor;   // Error.
};

error C2653: 'myVecContainer' : is not a class or namespace name
see reference to class template instantiation 'CTest<T>' being compiled.

Yes, the template type for the vector is not initialized. Please let me know, how can we use iterator for vector using templates.

[hamsterman]

myVecContainer is a variable. You can't use :: with that.

typename std::vector<T>::iterator myVecIterator is the right way.

[snova]

Thanks hamsterman; yes, it is variable & i shouldn't use it. But still my problem persist. Can you please point it? I am a beginner & learning templates.

typedef std::vector<T> 	     myVecContainer;
typedef myVecContainer::iterator myVecIterator;   // Error

myVecContainer m_VecContainer;
myVecIterator  m_VecIterator;  // Error  

[Peter87]

typedef typename myVecContainer::iterator myVecIterator;

[snova]

Thanks Peter87 & it compiles successfully. Please explain why we need to include "typename" in the code?

[Peter87]

The compiler doesn't know if std::vector<T>::iterator is a type or not. Someone could make a template specialization for std:vector<int> and make std:vector<int>::iterator a function, variable or something else, so what it is depends on the type T. typename is needed here to tell the compiler that it is a type, otherwise it will assume it's not a type.

[snova]

Thank you so much Peter87.