//marco 2007.1.23
//I didn't do it

从http://www.madore.org/ ~大卫/电脑/ callcc.html:

/* Yow!  DEMONS are flying through my NOSE! */

我刚刚完成了一个日志框架(使用Trace，为什么没有这样的存在我不知道)。我做了一个继承自TraceListener的方便基类。它覆盖了所有的TraceListener方法，并将它们路由到一个方法中——因此有很多文档注释:

// TODO: Need some codemonkey to doc comment this class.

在调试别人的JavaScript时，我看到了下面的评论:

// Notice: I feel so dirty doing this, but it's the only way to make it cross browser.

但在阅读Scott Hanselmen的一篇文章时，我看到了下面的引用，它与我在代码中发现的注释非常吻合:

Every line of code you write that you feel gross about will ultimately come back to haunt you. Therefore, avoid writing code that makes you feel dirty.

这很有趣。

我们的DBA在第三方编写的3000行存储过程中发现了这一点。

/* IF DOLPHINS ARE SO SMART, HOW COME THEY LIVE IN IGLOOS? */

Re eating one's own dogfood: We have the same term in our workplace (granted, only because I introduced it). My code is peppered with comments that say "TODO" and indicate something that ought to be done eventually, but a comment saying "DOGFOOD" (both keywords are always at the beginning of the comment, in all caps) means something that must be done before this program can be used even internally. It's a handy thing to search for, as the word "dogfood" is never going to appear in a quoted string - if it does, I can always just say "dog-food" or something - so even a case-insensitive search will come up with the right results.

Regarding zeroing the accumulator: I've done exactly the same thing when programming an Intel 80x86 (I started on the 8086 and moved up from there into the modern Pentiums). XORing a register with itself is the quickest and tightest way to clear it. Using "MOV AX,0" requires three bytes (opcode and two bytes of literal 16-bit zero), whereas "XOR AX,AX" is only two; it's even more noticeable with the 386-and-higher extended registers, where "MOV EAX,0" requires five bytes (four bytes of 32-bit zero). My C/C++ compiler always zeroes registers this way, so I'd assume it's still the best way (although I haven't studied opcode timing tables in ages, and probably both XOR reg,reg and MOV reg,imm take one clock).