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#include <iostream>
 
#include <vector>
#include <iterator>
 
 
template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
class PtrVector
{
private:
    typedef std::vector<_Tp, _Alloc> VectrorT;
    typedef typename std::vector<_Tp, _Alloc> VT;
 
public:
 
    typename std::vector<_Tp, _Alloc>::const_iterator test(){}
    VT::const_iterator test2(){}	// why there is error here?
 
};
 
 
int main() {
	return 0;
}

prog.cpp:17:5: error: need ‘typename’ before ‘PtrVector<_Tp, _Alloc>::VT::const_iterator’ because ‘PtrVector<_Tp, _Alloc>::VT’ is a dependent scope
     VT::const_iterator test2(){} // why there is error here?
     ^

Standard output is empty