[cfe-dev] New C++0x feature support in Clang

[Douglas Gregor]

On Jan 29, 2011, at 3:16 AM, Larry Evans wrote:

> On 01/26/11 15:45, Douglas Gregor wrote:
>> Clang has recently gotten much-improved support for the upcoming
>> C++0x standard. In particular, top-of-tree Clang now supports a
>> number of C++0x features:
>> 
>> 	- Rvalue references (including rvalue references for *this)
>> 	- Variadic templates
>> 	- Inline namespaces
>> 	- Late-specified return types
>> 	- Decltype
>> 
>> You can turn on C++0x support with the -std=gnu++0x (or, if you want
>> to be more pedantic, -std=c++0x).
>> 
>> Give it a spin, write some tests, try it out with libc++, and tell
>> us how it went!
> [snip]
> /home/evansl/prog_dev/boost-svn/ro/trunk/boost/config/no_tr1/utility.hpp:21:
> In file included from /usr/include/c++/4.4/utility:62:
> In file included from /usr/include/c++/4.4/bits/stl_pair.h:60:
> In file included from /usr/include/c++/4.4/bits/move.h:38:
> In file included from /usr/include/c++/4.4/type_traits:50:
> /usr/include/c++/4.4/tr1_impl/type_traits:233:29: error: type qualifier
> is not allowed on this function
>    struct is_function<_Res(_ArgTypes...) const>
>                            ^
> /usr/include/c++/4.4/tr1_impl/type_traits:233:12: error: redefinition of
> 'is_function<type-parameter-0-0
>      (type-parameter-0-1...)>'
>    struct is_function<_Res(_ArgTypes...) const>
>           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /usr/include/c++/4.4/tr1_impl/type_traits:227:12: note: previous
> definition is here
>    struct is_function<_Res(_ArgTypes...)>
>           ^
> /usr/include/c++/4.4/tr1_impl/type_traits:236:29: error: type qualifier
> is not allowed on this function
>    struct is_function<_Res(_ArgTypes......) const>
>                            ^
> /usr/include/c++/4.4/tr1_impl/type_traits:236:12: error: redefinition of
> 'is_function<type-parameter-0-0
>      (type-parameter-0-1..., ...)>'
>    struct is_function<_Res(_ArgTypes......) const>
>           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /usr/include/c++/4.4/tr1_impl/type_traits:230:12: note: previous
> definition is here
>    struct is_function<_Res(_ArgTypes......)>
>           ^
> /usr/include/c++/4.4/tr1_impl/type_traits:239:29: error: type qualifier
> is not allowed on this function
>    struct is_function<_Res(_ArgTypes...) volatile>

libstdc++ is using a non-standard g++ extension here that Clang doesn't (yet) support. That g++ extension is the subject of core issue 547:

	http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#547

	- Doug

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