你遇到过的源代码中最好的注释是什么?


当前回答

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).

其他回答

i++; //increment i
//Not a bug, parameter position can change..., if you think this is wrong, you are in fact wrong.

在编写MAPPER应用程序时,我们有一些标准,其中之一就是在整个套件中使用的标准变量列表。其中一个“V43”总是用来表示姓氏。所以,想象一下,当我被要求修复一大块MAPPER代码中唯一的注释是:

Here V43 contains the Surname
try {

} finally { // should never happen 

}

离开我的上一份工作,我嵌入了一些ascii艺术到源代码…


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