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#ifndef ITERATOR_H
#define ITERATOR_H 1
#include <iterator>
/** A counting output iterator. */
class CountingOutputIterator
{
public:
explicit CountingOutputIterator(size_t& count) : m_count(count)
{
m_count = 0;
}
CountingOutputIterator& operator++()
{
++m_count;
return *this;
}
CountingOutputIterator& operator*()
{
return *this;
}
template<typename T>
CountingOutputIterator& operator=(const T&)
{
return *this;
}
private:
size_t& m_count;
};
/** An output stream iterator, like ostream_iterator, that outputs the
* a delimiter before and after the item.
*/
template <class T,
class charT = char,
class traits = std::char_traits<charT> >
class affix_ostream_iterator :
public std::iterator<std::output_iterator_tag,
void, void, void, void>
{
public:
typedef charT char_type;
typedef traits traits_type;
typedef std::basic_ostream<charT, traits> ostream_type;
typedef void value_type;
affix_ostream_iterator(ostream_type& s,
charT const *prefix, charT const *suffix = NULL)
: os(&s), prefix(prefix), suffix(suffix)
{}
affix_ostream_iterator<T, charT,
traits>& operator =(T const &item)
{
if (prefix != NULL)
*os << prefix;
*os << item;
if (suffix != NULL)
*os << suffix;
return *this;
}
affix_ostream_iterator<T, charT, traits> &operator*() {
return *this;
}
affix_ostream_iterator<T, charT, traits> &operator++() {
return *this;
}
affix_ostream_iterator<T, charT, traits> &operator++(int) {
return *this;
}
private:
std::basic_ostream<charT, traits> *os;
charT const* prefix;
charT const* suffix;
};
/** Traits of an output iterator. */
template<class OutputIterator>
struct output_iterator_traits {
typedef typename OutputIterator::value_type value_type;
};
/** Traits of a back_insert_iterator. */
template<class Container>
struct output_iterator_traits<
std::back_insert_iterator<Container> >
{
typedef typename Container::value_type value_type;
};
/** Traits of an ostream_iterator. */
template<class T, class charT, class traits>
struct output_iterator_traits<
std::ostream_iterator<T, charT, traits> >
{
typedef T value_type;
};
/** Traits of an affix_ostream_iterator. */
template<class T, class charT, class traits>
struct output_iterator_traits<
affix_ostream_iterator<T, charT, traits> >
{
typedef T value_type;
};
#endif
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