id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7100	unorderd_set<shared_ptr<T> > > - insert does not increment count	Rich Eakin <reakinator@…>	Daniel James	"It seems unordered_set::insert has stopped working for shared_ptr's between v 1.48 and now.  Consider the following example:

{{{
#include <iostream>

#define USING_BOOST 1

#if USING_LIBCPP

	#include <unordered_set>
	#include <memory>

#elif USING_BOOST

	#include ""boost/shared_ptr.hpp""
	#include ""boost/unordered_set.hpp""

	using namespace boost;

#endif

using namespace std;

int main()
{
	unordered_set<shared_ptr<int> > mySet;
	shared_ptr<int> intSP( new int( 1 ) );

	cout << ""use_count A: "" << intSP.use_count() << endl;
	
	mySet.insert( intSP );

	cout << ""use_count B: "" << intSP.use_count() << endl;
 
    return 0;
}

}}}

In boost-trunk (and release version 1.50), use_count after the insert is still 1.  In boost version 1.48, the use_count is incremented by the insert to 2.  This is also the case with libc++.  

Sorry, I don't know what the results are in 1.49.

This was tested clang on Mac OS X:

{{{
$ clang --version
Apple clang version 4.0 (tags/Apple/clang-421.10.48) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix
}}}"	Bugs	closed	Boost 1.51.0	unordered	Boost 1.50.0	Problem	fixed	unordered_set shared_ptr