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wy.........不是偏序啊……

Posted by frkstyc at 2007-02-07 11:54:23 on Problem 2640
In Reply To:比较函数要满足偏序关系才能正确排序 Posted by:wywcgs at 2007-02-06 19:26:16 
是strict weak ordering...拟序 + !(x<y)&&!(y<x) => x==y

> 具体来说，就是
> 
> Irreflexivity 	x < x must be false.
> Antisymmetry 	x < y implies !(y < x) [2]
> Transitivity 	x < y and y < z implies x < z [3]
> 
> 以上摘自SGI STL Guide里的一段
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