io.cpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

/* Boost examples/io.cpp
 * show some exampleso of i/o operators
 * thanks to all the people who commented on this point, particularly on
 * the Boost mailing-list
 *
 * Copyright Guillaume Melquiond 2003
 * Permission to use, copy, modify, sell, and distribute this software
 * is hereby granted without fee provided that the above copyright notice
 * appears in all copies and that both that copyright notice and this
 * permission notice appear in supporting documentation.
 *
 * None of the above authors make any representation about the
 * suitability of this software for any purpose. It is provided "as
 * is" without express or implied warranty.
 *
 * $Id: io.cpp,v 1.2 2003/08/22 06:28:08 gmelquio Exp $
 */

#include <boost/numeric/interval.hpp>
#include <boost/io/ios_state.hpp>
#include <cmath>
#include <cassert>

namespace io_std {

template<class T, class Policies, class CharType, class CharTraits>
std::basic_ostream<CharType, CharTraits> &operator<<
  (std::basic_ostream<CharType, CharTraits> &stream,
   const boost::numeric::interval<T, Policies> &value)
{
  if (empty(value)) {
    return stream << "[]";
  } else {
    return stream << '[' << lower(value) << ',' << upper(value) << ']';
  }
}

} // namespace io_std

namespace io_sngl {

template<class T, class Policies, class CharType, class CharTraits>
std::basic_ostream<CharType, CharTraits> &operator<<
  (std::basic_ostream<CharType, CharTraits> &stream,
   const boost::numeric::interval<T, Policies> &value)
{
  if (empty(value)) {
    return stream << "[]";
  } else if (singleton(value)) {
    return stream << '[' << lower(value) << ']';
  } else {
    return stream << '[' << lower(value) << ',' << upper(value) << ']';
  }
}

} // namespace io_sngl

namespace io_wdth {

template<class T, class Policies, class CharType, class CharTraits>
std::basic_ostream<CharType, CharTraits> &operator<<
  (std::basic_ostream<CharType, CharTraits> &stream,
   const boost::numeric::interval<T, Policies> &value)
{
  if (empty(value)) {
    return stream << "nothing";
  } else {
    return stream << median(value) << "