John Torjo wrote:
Sorry, I mis-explained. For boost::bind, the above works like a bliss.
It will have problems working with other code, that uses result_type. For example, boost::transform_iterator:
#include <boost/bind.hpp> #include <boost/iterator/transform_iterator.hpp> using namespace boost; #include <algorithm> #include <vector> #include <string>
struct test { std::string s; };
void clear_s( std::string & s) { s.erase(); }
int main(int argc, char* argv[]) { std::vector<test> v; std::for_each( // of course, it would be simpler to use Range Template Library :D make_transform_iterator(v.begin(),mem_fn(&test::s)), make_transform_iterator(v.end(),mem_fn(&test::s)), clear_s);
return 0; }
Your examples are getting more and more contrived. ;-) To override the result_type, you'll need once again to revert to bind<std::string&>(mem_fn(&test::s), _1) instead of mem_fn(&test::s). If you do a "cvs update" you'll also be able to shorten it to bind<std::string&>(&test::s, _1)