Re: Refactoring a #define definition
Re: Refactoring a #define definition
- Subject: Re: Refactoring a #define definition
- From: Quincey Morris <email@hidden>
- Date: Sat, 25 Jul 2015 18:03:44 +0000
On Jul 25, 2015, at 10:37 , Carl Hoefs <email@hidden> wrote:
Effectively, what the compiler does with a #define _is_ a global replace.
It’s not, though. Not in general.
1. It’s not global. A #define can be undefined and redefined.
2. It’s not unique. IIRC, the appearance of the define symbol inside its own definition is *not* subject to macro expansion.
3. Macro expansion happens as a separate lexical pass over the input. For example, if source lines are not compiled as a result of a define/if then it’s not clear what replacement might be suitable at refactoring. Or again, token pasting may simply produce incorrect results if macro names are arbitrarily changed around them.
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