[Boost-users] iterators and value_type in multi_array

i'm new to boost, but use the standard template library a lot. I have problems with the following code. line 12: according to the reference, i should be able to do this, but cannot compile. compile error is very long, tell me if I should include them here. my compiler: gcc version 4.0.1 (Apple Inc. build 5490) thanks in advance for your help. 1 #include <boost/multi_array.hpp> 2 3 int main ( ) { 4 5 typedef boost::multi_array<double,2> matrix_type; 6 typedef matrix_type::iterator iterator; 7 8 matrix_type mat(boost::extents[2][3]); 9 double v = .2; 10 11 for(iterator it=mat.begin();it!=mat.end();++it) { 12 (*it) = v; // compile error 13 } 14 }