Re: [Boost-users] MultiArrays of Std::Lists: why const iterators?

Hi Joshua, I'm not completely clear on what you are attempting to do below, so I have turned what you wrote into a complete program. Does the following capture your intent? #include <list> #include "boost/multi_array.hpp" struct C { int m_foo; }; int main() { boost::multi_array listbin(boost::extents[3][3][3]); /// Walk through list at 0,0,0 for(std::list<C>::iterator iter = listbin[0][0][0].begin(); iter != listbin[0][0][0].end(); ++iter) { iter->m_foo += 42; } } The above compiles under GCC 3.3. Does it compile with your compiler? Cheers, ron On Oct 26, 2005, at 1:46 PM, Joshua Schpok wrote:

I want to make a 3D array of std::lists:

boost::multi_array listbin;

Then I'd like to actually use those lists:

/// Walk through list at x,y,z for(std::list<CSomething>::iterator iter = listbin[x][y][z].begin(); reti != iter[x][y][z].end(); iter++) { iter->m_foo += 42; }

But multi_array is giving me back *const* list iterators, producing the error:

error: conversion from `std::_List_const_iterator<CSomething>' to non-scalar type `std::_List_iterator<CSomething>' requested

Why is this so? I can trick the compiler by doing a cast like:

std::list<CSomething>::iterator iter = ((std::list<CSomething>)listbin[x][y][z]).begin();

but this seems to poop out at runtime. Is there a proper way to do this?

Joshua Schpok _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users