Re: [Annoyance] "git log .." thinks ".." is ambiguous

[Michael J Gruber <git@drmicha.warpmail.net>]

Joshua Juran venit, vidit, dixit 03.05.2011 03:57:
> On May 2, 2011, at 12:15 PM, Junio C Hamano wrote:
> 
>> diff --git a/revision.c b/revision.c
>> index f4b8b38..26271d1 100644
>> --- a/revision.c
>> +++ b/revision.c
>> @@ -905,14 +905,26 @@ int handle_revision_arg(const char *arg,  
>> struct rev_info *revs,
>> 		const char *this = arg;
>> 		int symmetric = *next == '.';
>> 		unsigned int flags_exclude = flags ^ UNINTERESTING;
>> +		static const char head_by_default[] = "HEAD";
>>
>> 		*dotdot = 0;
>> 		next += symmetric;
>>
>> 		if (!*next)
>> -			next = "HEAD";
>> +			next = head_by_default;
>> 		if (dotdot == arg)
>> -			this = "HEAD";
>> +			this = head_by_default;
>> +		if (this == head_by_default && next == head_by_default &&
>> +		    !symmetric) {
> 
> Is there a reason not to write
> 
> 	const char *head_by_default = "HEAD";
> 
> or even
> 
> 	const char *const head_by_default = "HEAD";
> 
> instead?  Loading a static array and checking an init flag is a  
> pessimization versus just pointing into a read-only segment.

Because of the comparisons later on: this == "HEAD" is not the same.

Michael