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#include <vector>
#include <algorithm>
 
namespace Namespace
{
	struct Bar
	{
	};
 
    bool barComparator( Bar& bar1 , Bar& bar2 )
    {
        return true;
    }
 
    struct Foo
    {	
		void doStuff()
		{
			std::vector<Bar> barVec;
			std::sort( barVec.begin() , barVec.end() , barComparator );
		}
	};
}	
 
int main()
{
};
 

In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Namespace::Bar*, std::vector<Namespace::Bar> >; _Tp = Namespace::Bar; _Compare = bool (*)(Namespace::Bar&, Namespace::Bar&)]’:
/usr/include/c++/4.8/bits/stl_algo.h:2319:78:   required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Namespace::Bar*, std::vector<Namespace::Bar> >; _Compare = bool (*)(Namespace::Bar&, Namespace::Bar&)]’
/usr/include/c++/4.8/bits/stl_algo.h:2360:62:   required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Namespace::Bar*, std::vector<Namespace::Bar> >; _Size = int; _Compare = bool (*)(Namespace::Bar&, Namespace::Bar&)]’
/usr/include/c++/4.8/bits/stl_algo.h:5513:44:   required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<Namespace::Bar*, std::vector<Namespace::Bar> >; _Compare = bool (*)(Namespace::Bar&, Namespace::Bar&)]’
prog.cpp:20:61:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:2287:35: error: invalid initialization of reference of type ‘Namespace::Bar&’ from expression of type ‘const Namespace::Bar’
    while (__comp(*__first, __pivot))
                                   ^
/usr/include/c++/4.8/bits/stl_algo.h:2290:34: error: invalid initialization of reference of type ‘Namespace::Bar&’ from expression of type ‘const Namespace::Bar’
    while (__comp(__pivot, *__last))
                                  ^

Standard output is empty