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From Martin Sebor <se...@roguewave.com>
Subject Re: Differences between tr1 and c++0x
Date Wed, 21 May 2008 15:23:44 GMT
Travis Vitek wrote:
> As most of us know, I've been working on type_traits for the 4.3
> release. In doing so, I've noticed that there are some pretty
> significant differences between tr1 and c++0x. My question is what
> _exactly_ are we wanting to implement here? Do we want to have the tr1
> stuff as it is documented [in the tr1 final], or do we want the tr1
> additions as they appear in the c++0x working draft?
> 
> Some of the issues...
> 
> 	1. The namespace that these features appear in [std::tr1 vs std]
>       2. Section numbers for test names [4.meta.rel.cpp vs
> 20.meta.rel.cpp]
> 	3. Subtle differences between behavior of traits
> 	4. Deprecated traits like add_reference [now
> add_lvalue_reference]
> 
> I just want to make absolutely sure that I'm working with the same
> expectations as everyone else and that we are trying to implement the
> c++0x draft features that were introduced in tr1. I'm currently writing
> to the c++0x draft, but my tests use old section numbers from the tr1
> final, and everything I've written is currently in the std::tr1
> namespace [using a macro _TR1].

IMO, we should target C++ 0x and forget TR1 even exists ;-)
That said, all C++ 0x code should be guarded with the same
macro until the next standard is released. Maybe something
like _RWSTD_NO_EXT_CXX_0X?

Martin

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