vector.cpp

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#include <iostream>   // for cout, endl
#include <iterator>   // for ostream_iterator
#include <vector>     // for vector
 
#include <examples.h>
 
 
// streams out a vector
template <class T>
std::ostream&
operator<< (std::ostream &out, const std::vector<T, std::allocator<T> > &v)
{
    typedef std::ostream_iterator<T, char, std::char_traits<char> > Iter;
 
    std::copy (v.begin (), v.end (), Iter (out, " "));
 
    return out;
}
 
 
int main ()
{
    const int a[] = { 9, 8, 7, 6, 5, 4, 3, 2, 1 };
 
    typedef std::vector<int, std::allocator<int> >        IntVector;
    typedef std::vector<double, std::allocator<double> >  DblVector;
 
    // demonstrate the initialization a vector of one type
    // from a range of of values of another type denoted by
    // either a pair of pointers or iterators
    const IntVector vi (a, a + sizeof a / sizeof *a);
    DblVector vd (vi.begin (), vi.end ());
 
    // print out the two vectors
    std::cout.setf (std::cout.showpoint);
    std::cout.precision (2);
 
    std::cout << vi << '\n' << vd << '\n';
 
    // overwrite the second vector with the same values
    // but of a different type
    const IntVector::size_type mid = vi.size () / 2;
 
    // demonstrate the assignment to a vector of one type
    // from a range of values of another type denoted by
    // a pair of iterators
    vd.assign (vi.begin (), vi.begin () + mid);
 
    // demonstrate the insertion into a vector of one type
    // from a range of values of another type denoted by
    // a pair of pointers
    vd.insert (vd.end (), a + mid, a + sizeof a / sizeof *a);
 
    // print out the second vector
    std::cout << vd << '\n';
 
    return 0;
}