Re: [boost] [function] function.hpp lacks include guard

Subject: Re: [boost] [function] function.hpp lacks include guard
From: Peter Bartlett (pete_at_[hidden])
Date: 2008-10-21 12:41:11

Quoting Niels Dekker - mail address until 2008-12-31  
<nd_mail_address_valid_until_2008-12-31_at_[hidden]>:

> Okko Willeboordse wrote:
>> My co-worker Bob Praster found, using PC-Lint 9.0, that
>> function.hpp doesn't have an include guard like;
>
> Mathias Gaunard wrote:
>> That's most likely because it doesn't need one, since it's
>> only including other headers.
>
> If so, it's probably just a matter of taste. Personally I always add
> those include guards to my headers, even when they're not strictly
> needed. Once in a while I might have to look into the preprocessor
> output, because of some buggy macro call of mine. In that case, I
> appreciate having each header included only once, to reduce the amount
> of noise in the preprocessor output file.
>
>> #ifndef BOOST_FUNCTION_HPP
>> #define BOOST_FUNCTION_HPP
>> ...
>> #endif // BOOST_FUNCTION_HPP
>
> Is it allowed to have an #endif followed by comment, on the very same line?
>
>
> Kind regards,
> --
> Niels Dekker

I haven't tested it, but looking at the code I think you can include  
boost/function.hpp multiple times and if BOOST_FUNCTION_MAX_ARGS is  
(re-)defined between any of those inclusions then everything still  
works as you'd hope.

Pete