RE: [boost] Re: Portable alternative for VS.NET __if_exists

From: Roman Yakovenko (roman.yakovenko_at_[hidden])
Date: 2005-01-04 23:44:12

> -----Original Message-----
> From: David Abrahams [mailto:dave_at_[hidden]]
> Sent: Tuesday, January 04, 2005 7:42 PM
> To: boost_at_[hidden]
> Subject: [boost] Re: Portable alternative for VS.NET __if_exists
> 
> 
> MÃ¥rten RÃ¥nge wrote:
> > I’m looking for a portable version of __if_exists (VS.NET 
> keyword) and
> > unfortunately google turned up nothing good. 
> > 
> > I use boost fairly regular and checked boost::type_traits 
> but found nothing
> > that seemed to similar.
> > 
> > Has anyone heard of something that can accomplish this?
> 
> It might help if you described what it does.

full explanation:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/vclrfthe__if_existsstatement.asp

short explanation:

__if_exists allows you to conditionally include code depending on whether the specified symbol exists.

__if_exist ( variable ) {
statements
}

where:

variable
    The symbol whose existence you want to test for.
statements
    One or more statements to execute if variable exists. 

> 
> -- 
> Dave Abrahams
> Boost Consulting
> http://www.boost-consulting.com
> 
> _______________________________________________
> Unsubscribe & other changes: 
> http://lists.boost.org/mailman/listinfo.cgi/boost
>