I've previously posted this on Stack Overflow, and am considering submitting it to Boost for wider distribution, but thought perhaps it would be best to put it up for peer review first, and see if there are clear improvements that can be made first.

This is (at least intended to be) pretty much a drop-in replacement for std::ostream_iterator, the sole difference being that (at least in normal use) it only print out delimiters between items instead of after every item. Code using it looks something like:

I've previously posted this on Stack Overflow, and am considering submitting it to Boost for wider distribution, but thought perhaps it would be best to put it up here for peer review first, and see whether there are clear improvements that can be made first.

This is (at least intended to be) pretty much a drop-in replacement for std::ostream_iterator, the sole difference being that (at least in normal use) it only prints out delimiters between items instead of after every item. Code using it looks something like:

Edit: In case anybody cares, here's the new version incorporating input from both @Konrad and @Loki. Thanks to both of you.

// infix_iterator.h #if !defined(INFIX_ITERATOR_H_) #define INFIX_ITERATOR_H_ #include <ostream> #include <iterator> #include <string> template <class T, class charT=char, class traits=std::char_traits<charT> > class infix_ostream_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> { std::basic_ostream<charT,traits> *os; std::basic_string<charT> delimiter; std::basic_string<charT> real_delim; public: typedef charT char_type; typedef traits traits_type; typedef std::basic_ostream<charT, traits> ostream_type; infix_ostream_iterator(ostream_type &s) : os(&s) {} infix_ostream_iterator(ostream_type &s, charT const *d) : os(&s), real_delim(d) {} infix_ostream_iterator<T, charT, traits> &operator=(T const &item) { *os << delimiter << item; delimiter = real_delim; return *this; } infix_ostream_iterator<T, charT, traits> &operator*() { return *this; } infix_ostream_iterator<T, charT, traits> &operator++() { return *this; } infix_ostream_iterator<T, charT, traits> &operator++(int) { return *this; } }; #endif