Dan Eloff <dan.eloff@gmail.com> writes:
If this is my fault the docs need to be more explanatory
I don't think so, unless it's Boost.Python's job to explain how to build C++ iterators. Your iterator is nonconforming in many ways. I suggest you use the Boost Iterator Library if you need to build one (http://www.boost.org/libs/iterator). In this case, you could probably use a transform_iterator over a counting_iterator. The problem here is that your operator++ doesn't return a copy of the original iterator, the way it should (but there are lots of other problems, so use the iterator library instead):
The code to reproduce this is:
#include <iterator>
#include <boost/python.hpp>
namespace py = boost::python;
struct ctn { struct iterator: public std::iterator< std::input_iterator_tag, py::str > { int mNum;
iterator( int num = 0 ): mNum( num ) {}
py::str operator *() const { char temp[20]; const char * str = itoa( mNum, temp, 10 ); return py::str( str, strlen( str ) ); }
iterator operator ++(int) { iterator tmp = *this; mNum++; return tmp; }
friend bool operator ==( iterator lhs, iterator rhs ) { return ( lhs.mNum == rhs.mNum ); } };
iterator begin() { return iterator( 0 ); }
iterator end() { return iterator( 3 ); // the range (0, 1, 2) three items } };
HTH, -- Dave Abrahams Boost Consulting http://www.boost-consulting.com