记录一下结构体排序的问题(vector,map)

struct CoorEx

{

COOR co;

bool operator < (const CoorEx& cc )  const

{

if (algv3::ISZERO( cc.co.x - this->co.x ))

{

return cc.co.y < this->co.y;

}

else if (algv3::ISZERO( cc.co.y - this->co.y))

{

return cc.co.x < this->co.x;

}

else

return ( cc.co.x < this->co.x );

}

CoorEx& operator=( const CoorEx &cc)

{

this->co.x = cc.co.x;

this->co.y = cc.co.y;

this->co.z = cc.co.z;

return *this;

}

};