id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5547	boost::range::join ambiguous with boost::algorithm::join	chris.byrne@…	Neil Groves	"= Summary =

Calling boost::join with an iterator range when both boost algorithm and boost range join.jpp headers have been included, introduces an ambiguity with Visual Studio 2010.

= Steps to Reproduce =

{{{
#include <vector>
#include <boost/algorithm/string/join.hpp>
#include <boost/range/join.hpp>

int main() {
	std::vector< int > vec1;
	std::vector< int > vec2;
	
	boost::join(
		vec1,
		boost::make_iterator_range( vec2.begin(), vec2.end() )
	);
	
	return 0;
}
}}}

= Expected Results =

Code to compile and do nothing.

= Actual Results =

`main.cpp(16): error C2668: 'boost::range::join' : ambiguous call to overloaded function`

`boost\range\join.hpp(65): could be 'boost::range::join`

`boost\algorithm\string\join.hpp(46): or       'boost::algorithm::join'`

= Notes =

boost::algorithm::join is pulled into the boost namespace with a using declaration. boost::join is defined directly in the boost namespace by the range library meaning I can't explicitly refer to it.

Current workaround is to move boost::join into boost::range::join, and then pull it into the boost namespace with a using declaration.


{{{
namespace range {

join(SinglePassRange1& r1, SinglePassRange2& r2);

} // namespace range

using range::join;
}}}

Allowing the example code to be resolved by being more explicit:


{{{
boost::range::join(
	vec1,
	boost::make_iterator_range( vec2.begin(), vec2.end() )
);
}}}
"	Bugs	closed	To Be Determined	range	Boost 1.46.1	Problem	fixed