On 12 Nov 2013, at 22:19, Tijl Coosemans <t...@coosemans.org> wrote: ... There's a similar problem with graphics/blender. There's a class > TreeElement which links to its parent TreeElement like this: > > std::map<std::string, TreeElement>::const_iterator parent; > > Works with libstdc++, fails with libc++. If the standard doesn't > specify this it would still be a very convenient extension.
The standard explicitly says this is undefined, except for a few specific (non-container) classes in C++11. So to write portable code, you should not rely on this "feature" to be available. Besides, it is relatively easy to work around. Except for the case of pan, where it is abused all over the place, and it seems tricky to fix without overhauling a lot of code... :-/ -Dimitry
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