Re: [boost] painless currying

Subject: Re: [boost] painless currying
From: Edward Diener (eldiener_at_[hidden])
Date: 2011-09-01 18:23:16

On 9/1/2011 5:43 PM, Daniel James wrote:
> On 1 September 2011 05:07, Paul Mensonides<pmenso57_at_[hidden]>  wrote:
>>
>> 1) GCC performs macro expansion and parsing on the expressions of all #if/
>> #elif/#endif blocks that it encounters when not already skipping because
>> of an outer #if/#endif.  It is questionable whether this is what was
>> intended, but it is arguable either way.
>
> I think it was made due to:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36320

The remark refers in the resolution above refers to "my reading of the 
standard" but does not say which standard is being referred to. Is this 
part of C99 or C++11 ? I have asked about this on the C++ standard NG 
and am awaiting an answer.

I am surprised by the evaluation of "#elif constant expression" when the 
corrwesponding #if statament is true because it means that #if - #elif 
is not equivalent to #if - #else - #if in this particular case, and I am 
sure many C++ programmers would have expected that the two were indeed 
equivalent.