Re: [Boost-users] [boost::transform_iterator] failure with std::vector::const_iterator

Ovanes Markarian wrote:

Hello!

I have an assertion failure using std::vector::const_iterator and boost::transform_iterator.

I have a constant seq of constant string pairs delimited by special character (here ':'). My application needs only once to iterate through these pairs and return iterator ranges from the beginning until the colon and after colon until the end. I thought a transform iterator can do the job. I get in the marked position an assertion failure using MSVC 2005 Express Edition.

Here the code snippet with problem description:

#include <string> #include <vector> #include <utility> #include <functional>

#include #include #include #include

typedef boost::iterator_rangestd::string::const_iterator iter_range; typedef std::pair result_type;

struct string_splitter : std::unary_function { result_type operator()(std::string const& s)const throw() { iter_range r1(s.begin(), s.begin() + s.find(":")); iter_range r2(r1.end()+1, s.end()); return result_type(r1,r2); } };

typedef std::vectorstd::string str_vector; typedef str_vector::const_iterator vector_citer; typedef boost::transform_iterator msg_opcode_citer;

int main() { //create vector of strings and put 2 strings inside str_vector v; v.push_back(std::string("test1:opcode1")); v.push_back(std::string("test2:opcode2"));

//!!!increment operator or dereference operator cause an assertion failure!!! // stating: "vector iterators incompatible" for(msg_opcode_citer curr = msg_opcode_citer(const_cast(v).begin(), string_splitter()), end; curr != end; ++curr) { result_type t = *curr; }

return 0; }

Did I miss something?

'end' seems not initialized. Try.. for(msg_opcode_citer curr = msg_opcode_citer(boost::const_begin(v), string_splitter()), end = msg_opcode_citer(boost::const_end(v), string_splitter()); curr != end; ++curr) { result_type t = *curr; } Regards, -- Shunsuke Sogame