c++对结构体排序(仿函数)

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结构体中按照第一个元素进行排序

比如：

op compareGreater;

sort(regionA.begin(),regionA.end(),compareGreater);

sort(regionB.begin(),regionB.end(),compareGreater);

merge(regionA.begin(),regionA.end(),regionB.begin(),regionB.end(),tempVector.begin(),compareGreater);

struct abc<span style="font-family: Arial, Helvetica, sans-serif;">{</span>

 <span style="white-space:pre"></span>int a; <span style="white-space:pre"></span>double b; <span style="white-space:pre"></span>int c;};class op{public: bool operator()(abc a,abc b){  if (a.a>b.a)  {   return true;  }  else

{   return false;  } }};

struct abc<span style="font-family: Arial, Helvetica, sans-serif;">{</span>

 <span style="white-space:pre"></span>int a; <span style="white-space:pre"></span>double b; <span style="white-space:pre"></span>int c;};class op{public: bool operator()(abc a,abc b){  if (a.a>b.a)  {   return true;  }  else

{   return false;  } }};

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