On Wed, Jul 7, 2010 at 3:30 AM, Max S. Kaznady
Hi Robert,
Yep, the following works great. Not sure why the same code doesn't work when I have it in my larger project, but I guess that's for me to figure out.
There is still the problem with the std::for_each, see below:
#include <iostream> #include <vector> #include <algorithm> #include
#include "boost/bind.hpp" #include #include int main( ) { boost::numeric::ublas::vector<double> v(10); double exponent = 2.1; std::fill(v.begin(), v.end(), 8.0); // The following works just fine: std::transform( v.begin(), v.end(), v.begin(), boost::bind( pow, _1, exponent ) ); // But the for_each doesn't apply the power function, just leaves the vector unaltered std::for_each( v.begin(), v.end(), boost::bind( pow, _1, exponent ) ); // Print the result std::cout<< v << std::endl;
return 0; }
Compiled with: g++ -O2 -Wfatal-errors -Wall -g -ansi -I/usr/local/boost/include -o main main.cpp
Hi Max I haven't taken the time to try this, but does this do the trick? std::for_each(v.begin(), v.end(), boost::bind(pow, boost::ref(_1), exponent)); Cheers - Rob.