[Boost-users] Reverse for loop with boost::adaptors::reverse crashes

25 Nov 2014

      Hi,

I was trying to replace BOOST_REVERSE_FOREACH with the standard 
range-based for loop.

#include <boost/range/adaptor/reversed.hpp>
#include <boost/foreach.hpp>
#include <vector>
#include <iostream>

std::vector<int> getv() {
   return std::vector<int>{1,2,3};
}

int main(int argc, char* argv[]) {
   // works fine:
   BOOST_REVERSE_FOREACH(int i, getv())
     std::cout << i << std::endl;
   // crashes:
   for(int i : boost::adaptors::reverse(getv()))
     std::cout << i << std::endl;
   return 0;
}

Maybe this is basic C++ I should understand; it looks like the temporary 
vector returned by getv() gets destroyed in the 2nd loop too soon.  I 
was wondering whether the adaptor could warn me that I'm using it in a 
wrong way (the code looks so nice and compiles cleanly...).

Thanks,
Filip

[Boost-users] Reverse for loop with boost::adaptors::reverse crashes

Filip Konvička