compiler errors on iterator

[frankz]

Below is a piece of code that I abstracted from a C++ book but doesn't
compile. If I substitute template class T with int type, it compiles.
Don't know why?

#include <iostream>

#include <iterator> // for iterator

using std::cout;

using std::cin;

using std::endl;





#include <vector>



template <class T>

void printVector( const std::vector<T> &vec)

{

std::vector<T>::const_iterator i;

for (i=vec.begin(); i!= vec.end();i++)

cout << *i << " ";

}

g++ -Wall -o "stl" "stl.cpp"
stl.cpp: In function ‘void printVector(const std::vector<T,
std::allocator<_CharT> >&)’:
stl.cpp:13: error: expected ‘;’ before ‘i’
stl.cpp:14: error: ‘i’ was not declared in this scope
Compilation failed.

 

[frankz]

Try

typename std::vector<T>::const_iterator i;

/Leigh

Thanks a lot! Can you explain why? btw The original code is from "C++
How to program"

 

[red floyd]

Thanks a lot! Can you explain why? btw The original code is from "C++
How to program"

Yes, It's a FAQ. Please see the FAQ, in particular FAQ 35.18

http://www.parashift.com/c++-faq-lite