Paul C. Leopardi wrote: >Hi, >Two related questions. > >1. Is the difference in interface between __gnu_cxx::hash_map and >std::tr1::unordered_map documented anywhere? Does the fact that I can't find >any such gcc - specific documentation mean that std::tr1::unordered_map is a >trivial drop-in replacement for __gnu_cxx::hash_map ? > > > Unfortunatly it's not. There isn't explicit differences documented either. Documentation for tr1::unordered_map is contained in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1745.pdf If you get a copy of the complete g++ source code, then look in libstdc++-v3/testsuite/tr1/6_containers/ you'll find the testsuite for the unordered containers, which should at least show the basics of how they work, although I'll admit not documented. >2. I've been trying to use std::tr1::unordered_map as a replacement for >__gnu_cxx::hash_map, with gcc version 4.0.2 20050728 (prerelease), and have >encountered errors. Is this mailing list the correct place to check to see if >I am using std::tr1::unordered_map correctly, and to check that it should >work with gcc version 4.0.2 20050728 (prerelease)? > > > I believe it is, although it's fairly new, so don't be too suprised if you don't get too many replies :) Unfortunatly, as I say, it's not designed as a drop-in replacement. It would definatly be advisable to move toward using it however, as except in extreme cases bug reports for __gnu_cxx::hash_map are being ignored, and it's going to be phased out in the not-too-distant future. Any problems with tr1::unordered_map have a much better change of being fixed :) Chris
