1.ostream_iterator

template <class _Tp,

          class _CharT = char, class _Traits = char_traits<_CharT> >

class
ostream_iterator {

public:

typedef _CharT                         char_type;

typedef _Traits                        traits_type;

typedef basic_ostream<_CharT, _Traits> ostream_type;

typedef output_iterator_tag            iterator_category;

typedef void                           value_type;

typedef void                           difference_type;

typedef void                           pointer;

typedef void                           reference;

ostream_iterator(ostream_type&
__s) :
_M_stream(&
__s),
_M_string(0) {}

ostream_iterator(ostream_type&
__s, const _CharT*
__c)

    :
_M_stream(&
__s),
_M_string(
__c) {}

ostream_iterator<_Tp>&
operator=(const _Tp&
__value) {

    *
_M_stream <<
__value;

    if (
_M_string) *
_M_stream <<
_M_string;

    return *this;

}

ostream_iterator<_Tp>&
operator*() { return *this; }

ostream_iterator<_Tp>&
operator++() { return *this; }

ostream_iterator<_Tp>&
operator++(int) { return *this; }

private:

ostream_type*
_M_stream;

const _CharT*
_M_string;

};

2.示例

http://www.cplusplus.com/reference/iterator/ostream_iterator/

// ostream_iterator example
#include <iostream>     // std::cout
#include <iterator>     // std::ostream_iterator
#include <vector>       // std::vector
#include <algorithm>    // std::copy

int main () {
  std::vector<int> myvector;
  for (int i=1; i<10; ++i) myvector.push_back(i*10);

  std::ostream_iterator<int> out_it (std::cout,", ");
  std::copy ( myvector.begin(), myvector.end(), out_it );
  return 0;
}

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运行结果：

ostream iterator