C + + Learning: A mistake about "Std::vector<type>::iterator"

The following iterators are defined inside the class template:

Template<class type>class classname{private:         vector<type>::iteratoriter;};

The error that appears is as follows:

This is because the vector itself is a template, and the type is unknown until its template parameters are undefined, that is, the type is not specified.

Here's how to fix it:

Template<class type>class classname{private:         typename Vector<type>::iterator iter;};

Plus TypeName is to tell the compiler to let you know when the template is instantiated, regardless of the specific type.

C + + Learning: A mistake about "Std::vector<type>::iterator"