[signals] failure to build with recent gcc
I get a number of the same failures when doing a clean build of boost trunk with a recent gcc (4.6.0). libs/signals/src/named_slot_map.cpp:105:23: instantiated from here /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.0/../../../../include/c++/4.6.0/bits/stl_map.h:626:9: error: call of overloaded ‘erase(std::map<boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair>, boost::function2<bool, boost::signals::detail::stored_group, boost::signals::detail::stored_group> >::iterator&)’ is ambiguous /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.0/../../../../include/c++/4.6.0/bits/stl_map.h:626:9: note: candidates are: /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.0/../../../../include/c++/4.6.0/bits/stl_tree.h:763:7: note: void std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::erase(std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::const_iterator) [with _Key = boost::signals::detail::stored_group, _Val = std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> >, _KeyOfValue = std::_Select1st<std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> > >, _Compare = boost::function2<bool, boost::signals::detail::stored_group, boost::signals::detail::stored_group>, _Alloc = std::allocator<std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> > >, std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> > >] /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.0/../../../../include/c++/4.6.0/bits/stl_tree.h:1490:5: note: std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::erase(const _Key&) [with _Key = boost::signals::detail::stored_group, _Val = std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> >, _KeyOfValue = std::_Select1st<std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> > >, _Compare = boost::function2<bool, boost::signals::detail::stored_group, boost::signals::detail::stored_group>, _Alloc = std::allocator<std::pair<const boost::signals::detail::stored_group, std::list<boost::signals::detail::connection_slot_pair> > >, std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type = unsigned int] Patrick
Hi Patrick, On Mon, December 20, 2010 1:52 am, Patrick Horgan wrote:
I get a number of the same failures when doing a clean build of boost trunk with a recent gcc (4.6.0).
libs/signals/src/named_slot_map.cpp:105:23: instantiated from here error: call of overloaded erase(...[snip]...iterator&) is ambiguous
I hit this issue building boost 1.44.0 with gcc trunk last night. The following patch works around the ambiguity by using const_group_iterator instead of just group_iterator. Don't know if this is an issue with boost or gcc but this got it building for me. Note that I don't know about any performance or run-time issues this patch may cause -- I just wanted to get it built. Regards, Adam --- boost_1_44_0/libs/signals/src/named_slot_map.cpp +++ boost_1_44_0/libs/signals/src/named_slot_map.cpp @@ -102,7 +102,7 @@ i->first.disconnect(); i = next; } - groups.erase(group); + groups.erase(const_group_iterator(group)); } } @@ -125,7 +125,7 @@ } // Clear out empty groups - if (empty(g)) groups.erase(g++); + if (empty(g)) groups.erase(const_group_iterator(g++)); else ++g; } }
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Patrick Horgan