New subject: [boost::transform_iterator] failure withstd::vector::const_iterator

4 Mar 2007

      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?

With Kind Regards,

Ovanes Markarian

[boost::transform_iterator] failure with std::vector::const_iterator

Ovanes Markarian

shunsuke

Ovanes Markarian

David Abrahams

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