怎么定义比较类

ShenYounger

于 2015-11-01 23:21:51 发布

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分类专栏：数据结构及算法

本文链接：https://blog.youkuaiyun.com/wusecaiyun/article/details/49563901

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本文介绍了如何通过在C++中定义const bool operator()函数来优化字符串比较操作，并提供了具体的实现代码示例。

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转自overstackflow

Two things:

Define your bool operator() as const. It's just a good practice. This tells the compiler that this function will not have side-effects on the member variables of the class.
Add const & qualifiers to the lhs and rhs arguments. Passing constant references instead of copying memory all over the place is also good practice. By declaring references as constyou're telling compiler that this function should not have side-effects on the referenced objects.

Your operator() should look as follows:

bool operator() (const string &lhs, const string &rhs) const 
{
  return strcasecmp(lhs.c_str(), rhs.c_str())  < 0;
}