C++之greater和less

1、greater、 less

他在头文件<functional>里面， greater和less都重载了操作符

定义如下：

// TEMPLATE STRUCT greater
template<class _Ty>
struct greater : public binary_function<_Ty, _Ty, bool>
{   // functor for operator>bool operator()(const _Ty& _Left, const _Ty& _Right) const{  // apply operator> to operandsreturn (_Left > _Right);}
};// TEMPLATE STRUCT less
template<class _Ty>
struct less : public binary_function<_Ty, _Ty, bool>
{   // functor for operator<bool operator()(const _Ty& _Left, const _Ty& _Right) const{  // apply operator< to operandsreturn (_Left < _Right);}
};

2、Demo测试

我们一般用sort函数的时候，可以作为函数指针传递下去，不需要单独写比较函数作为函数指针传递给sort函数的第三个参数

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C++之greater和less

1、greater、 less

2、Demo测试

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