stl 질문입니다.

요즘에 stl을 공부하고 있는데...처음부터 막히네요!

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

#include <vector>


template< class T >
void printVector( const std::vector< T > &integers2 );

int main ( void )
{
    const int SIZE = 6;
    int array[ SIZE ] = { 1, 2, 3, 4, 5, 6 };
    std::vector< int > integers;

    cout << "The initial size of integers is: "
         << integers.size()
         << "\nThe initial capacity of integers is: "
         << integers.capacity();

    integers.push_back( 2 );
    integers.push_back( 3 );
    integers.push_back( 4 );

    cout << "\nThe size of integers is: " << integers.size()
         << "\nThe capacity of integers is: "
         << integers.capacity();

    cout << "\n\nOutput array using pointer notaion: ";

    for ( int *ptr = array; ptr != array + SIZE; ++ptr )
        cout << *ptr << ' ';

    cout << "\nOutput vector using iteratornotation: ";
    printVector( integers );

    cout << "\nReversed contents of vector integers: ";

    std::vector< int >::reverse_iterator reverseIterator;

    for ( reverseIterator = integers.rbegin();
            reverseIterator != integers.rend();
            ++reverseIterator )
        cout << *reverseIterator << ' ';

    cout << endl;

    return 0;
}

template< class T >
void printVector( const std::vector< T > &integers2 )
{
    std::vector< T >::const_iterator constIterator;

    for ( constIterator = integers2.begin();
            constIterator != integers2.end();
            ++constIterator )
  cout << *constIterator << ' ';
}

다음과 같은 warning 나옵니다.
fig.cpp: In function `void printVector(const std::vector<T,
std::allocator<_CharT> >&)':
fig.cpp:57: warning: `typename std::vector<T, std::allocator<_CharT>
>::const_iterator' is implicitly a typename
fig.cpp:57: warning: implicit typename is deprecated, please see the
documentation for details

왜 이렇게 나오는지 감이 안잡힙니다.