Subject: Re: [Boost-users] [Proto] typeof in Hello World example
From: Eric Niebler (eric_at_[hidden])
Date: 2010-11-15 16:47:51
On 11/15/2010 11:33 AM, Hossein Haeri wrote:
> Dear Eric,
>
>> No, it belongs there for portability, but it is not needed on all
>> compilers. Some older compilers don't have a decltype, typeof or
>> __typeof__ operator. On those compilers, types need to be
>> registered with the Boost.Typeof library, which provides
>> emulation.
>
> So, which part of the code will need this, could you explain? And, I
> would also suggest that you add the same explanation -- perhaps in
> the form of a footnote -- to the user guide.
The proto::_default transform needs typeof (built-in or emulated) to
know type type of an expression, so it knows what to return.
Good idea about the users' guide.
-- Eric Niebler BoostPro Computing http://www.boostpro.com