id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13002	boost::prior does not compile when used with std::set reverse_iterator	Cory Omand <comand@…>	No-Maintainer	"Given the following code snippet:

{{{
#include <boost/prior_next.hpp>
#include <set>

int main(int argc, char *argv[])
{
    std::set<int> myints { 1, 2, 3, 4, 5 };
    boost::prior(myints.rbegin(), 1);
    return 0;
}
}}}

This fails to compile against boost 1.61.0.

{{{
$ g++ -std=c++11 boost-test.cpp
In file included from /usr/lib/gcc/x86_64-redhat-linux-gnu/4.8.3/include/c++/iterator:63:0,
                 from /usr/include/boost/next_prior.hpp:15,
                 from boost-test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux-gnu/4.8.3/include/c++/bits/stl_iterator.h: In instantiation of ‘std::reverse_iterator<_Iterator>& std::reverse_iterator<_Iterator>::operator-=(std::reverse_iterator<_Iterator>::difference_type) [with _Iterator = std::_Rb_tree_const_iterator<int>; std::reverse_iterator<_Iterator>::difference_type = long int]’:
/usr/include/boost/next_prior.hpp:138:11:   required from ‘static T boost::next_prior_detail::prior_impl1<T, Distance, true>::call(T, Distance) [with T = std::reverse_iterator<std::_Rb_tree_const_iterator<int> >; Distance = int]’
/usr/include/boost/next_prior.hpp:160:68:   required from ‘T boost::prior(T, Distance) [with T = std::reverse_iterator<std::_Rb_tree_const_iterator<int> >; Distance = int]’
boost-test.cpp:7:36:   required from here
/usr/lib/gcc/x86_64-redhat-linux-gnu/4.8.3/include/c++/bits/stl_iterator.h:265:10: error: no match for ‘operator+=’ (operand types are ‘std::_Rb_tree_const_iterator<int>’ and ‘std::reverse_iterator<std::_Rb_tree_const_iterator<int> >::difference_type {aka long int}’)
  current += __n;
          ^
}}}

There do not appear to be any further changes to boost/next_prior.hpp since the current state of that file in 1.61 after commit 651a869, so it is identical to the header shipped in 1.64."	Bugs	closed	To Be Determined	utility	Boost 1.61.0	Regression	duplicate