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Subject: Re: [boost] [config] gcc and <unordered_set> vs <ext/hash_set>
From: Giovanni Piero Deretta (gpderetta_at_[hidden])
Date: 2008-12-17 05:21:34

On Tue, Dec 16, 2008 at 9:48 PM, David Abrahams <dave_at_[hidden]> wrote:
> on Tue Dec 16 2008, Juergen Hunold <> wrote:
>> Hi John !
>> On Tuesday 16 December 2008, John Maddock wrote:
>>> Folks, Dave A. asked for a config macro to detect the presence of std
>>> conforming <unordered_set> and <unordered_map>.
>> This would be great.
>>> However, I've run into an unexpected issue: it appears that with
>>> gcc-4.3.x you cannot include both <unordered_set> and <ext/hash_set>
>>> as attempting to do so leads to endless errors inside the <ext/*>
>>> headers :-(
>>> Including either one of the headers is just fine though.
>> But the <unordered_*> headers are only available with -std=c++0x.
> Huh, good point. Too bad you have to set a compiler flag for that one.

I think that they are also available with stdc++ TR1 implementation,
which IIRC doesn't require to be enabled via compiler flags.



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