stream_iterator.cpp

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#include <algorithm>  // for copy
#include <iostream>   // for cin, cout, endl
#include <iterator>   // for stream_iterators, inserter
#include <vector>     // for vector
#include <numeric>    // for accumulate
 
#include <examples.h>
 
int main ()
{
    // Typedefs for convenience.
    typedef std::vector<int, std::allocator<int> > Vector;
 
    typedef std::istream_iterator<Vector::value_type,
                                  char, std::char_traits<char>,
                                  std::ptrdiff_t> is_iter;
 
    typedef std::ostream_iterator<Vector::value_type,
                                  char, std::char_traits<char> > os_iter;
 
    Vector v;
 
    Vector::value_type sum = 0;
 
    // Collect values from cin until end of file
    // Note use of default constructor to get ending iterator
    std::cout << "Enter a sequence of integers (eof to quit): " ;
    std::copy (is_iter (std::cin), is_iter (), std::inserter (v, v.begin ()));
 
    // Stream the whole vector and the sum to cout.
    std::copy (v.begin (), v.end () -1, os_iter (std::cout, " + "));
 
    if (v.size ())
        std::cout << v.back () << " = " <<  
            std::accumulate (v.begin (), v.end (), sum) << std::endl;
 
    return 0;
}