troubleshooting Question

typedef within template class

Avatar of Rothbard
RothbardFlag for United Kingdom of Great Britain and Northern Ireland asked on
C++
5 Comments1 Solution597 ViewsLast Modified:
I have a vector class with the following typedefs

template <class T> class Vec
{
public:
	// definitions
	typedef T* iterator;
	typedef const T* const_iterator;
	typedef T value_type;
	typedef size_t size_type;
	typedef std::ptrdiff_t difference_type;
	typedef T& reference;
	typedef const T& const_reference;
[...]}
Everything works fine, but when I want to implement an erase method to mimic the STL one, I find that I can only use iterator instead of T* (as per the typedef above) if I include the function definition within the Vec class definition. If on the other hand I only declare erase within the class definition as follows:

iterator erase(iterator it);

Then I can't define it externally in Vec.cpp as

template <class T> iterator Vec<T>::erase(iterator it) {[...]}
but I need to use T* instead of iterator:

template <class T> T* Vec<T>::erase(T* it) {[...]}
which sort of defeats the purpose of using the typedef.

Why does this happen? Is there any way around it?
ASKER CERTIFIED SOLUTION
evilrix
Senior Software Engineer (Avast)

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