Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.compilers > #713

Re: C arcana, was type or identifier fundamental parsing issue - Need help from parsing experts

Show all headers | View raw

On Jul 4, 11:43 am, Hans-Peter Diettrich <DrDiettri...@aol.com> wrote:

> There exist pros and cons. The C preprocessor *requires* that sizeof
> is a built-in *macro*, so that it can be used in #if conditions.

Ahem... No, it doesn't. Unless you do something really perverse like

#define sizeof <whatever>

sizeof will not be defined as a macro, and any non-macro identifier
used within #if other than as an operand to "defined" will be replaced
by 0.
[After squinting at the various C standards and checking with
committee members, I found that the C preprocessor does not know
about any keywords at all, so it treats sizeof and int as ordinary
names.  This allows occasionaly useful kludges like #define short int
-John]

Back to comp.compilers | Previous | Next — Previous in thread | Find similar

Thread

type or identifier fundamental parsing issue - Need help from parsing experts AD <hsad005@gmail.com> - 2012-07-03 11:30 -0700
  Re: type or identifier fundamental parsing issue - Need help from parsing experts George Neuner <gneuner2@comcast.net> - 2012-07-04 00:57 -0400
    Re: type or identifier fundamental parsing issue - Need help from parsing experts torbenm@diku.dk (Torben Ægidius Mogensen) - 2012-07-11 12:17 +0200
  Re: type or identifier fundamental parsing issue - Need help from parsing experts Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-07-04 11:43 +0100
    Re: C arcana, was type or identifier fundamental parsing issue - Need help from parsing experts "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-07-12 09:23 -0700

csiph-web