examples/manual/vector.cpp

/**************************************************************************
 *
 * vector.cpp - Example program of vector. See Class Reference Section
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/vector.cpp#14 $
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/
 
#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;
}