doc: clarify check for NULL pointer style

Our code should be terse and clear.
13 years ago · e004bc16a1
parent fb5c1aaea6
commit e004bc16a1
1 changed files with 4 additions and 0 deletions
--- a/doc/developer.texi
+++ b/doc/developer.texi
@ -73,6 +73,10 @@ const char *avfilter_configuration(void)
@}
@end example
@item
+Do not check for NULL values by comparison, @samp{if (p)} and
+@samp{if (!p)} are correct; @samp{if (p == NULL)} and @samp{if (p != NULL)}
+are not.
+@item
 In case of a single-statement if, no curly braces are required:
@example
 if (!pic || !picref)