Re: [v3] c++0x includes

[Douglas Gregor <doug dot gregor at gmail dot com>]

On Feb 21, 2007, at 4:23 AM, Benjamin Kosnik wrote:
> This adds C++0x includes when -std=c++0x.
>
> I'm posting this mostly for feedback, as there are a couple of  
> issues that deserve more discussion.

Thanks for doing this!

> 3) C++98/C++0x interface issues
>
> a) should C++0x includes warn when included without -std=c++0x, or  
> just do nothing?

I expect that C++0x includes may make use of C++0x features not  
available without -std=c++0x, so a hard #error might be the right  
approach.

> b) what happens when both TR1 and C++0x includes in the same  
> translation unit? Ie, for debug mode, we have:
> [snip debug mode]
> But:
>
> #include <tr1/array>
> #include <array>
>
> int main()
> {
>   std::array<int, 5> v;
>   std::tr1::array<int, 5> v2;
>   return 0;
> }
>
> ... are mutually exclusive in this patch.
>
> without -std=c++0x, std::array falls down.
> with -std=c++0x, std::tr1 falls down.
>
> Although this seems like sensible behavior, I thought I'd point it  
> out.

If one uses -std=c++0x, and #includes <tr1/array>, does  
"std::tr1::array<int, 5> v3;" work? i.e., is TR1 still available in C+ 
+0x mode?

> ps. FREE THE VARIADIC TEMPLATES

:)

	Cheers,
	Doug