Question

struct triangle {
triangle( vertice * p0,  vertice * p1,  vertice * p2)
    :tv1(0)
    ,tv2(0)
    ,tv3(0)
{
    m_Vertices[0] = p0;
    m_Vertices[1] = p1;
    m_Vertices[2] = p2;
    //SetCircumCircle();
 };  triangle *tv1,*tv2,*tv3;}


struct vertice

{    
    vertice (  int init_val=0) :id (init_val) {};
    vertice (double xx, double yy=0):x(xx),y(yy) { };
    int id;
    double x,y;
}; 
std:: vector <triangle> triangles;
 void cre_triangle()
{
    triangle r(0,1,2);
    triangle r2(3,4,6);
    r.tv1= &r2;
    r.tv2=0;
    r.tv3=0;
    cout << r.tv1->m_Vertices[0]->id << r.tv1->m_Vertices[1]->id
<< r.tv1->m_Vertices[2]->id;           //the result is  3 4 6 
    triangles.pushback(r);
} 
int main ()
{
    cre_triangle();
    cout << triangles[0].tv1->m_Vertices[0]->id <<triangles[0].tv1->m_Vertices[1]->id
      <<triangles[0].tv1->m_Vertices[2]->id << endl ;     
  // problem here  (....exe has stopped working) 
     return 0;
}

我去了访问id和三角形r2的顶点坐标r（tv1是邻居1）并修改它但我有一个问题（appilcation.exe已停止工作）请你能帮帮我..

Answer 1

您正在存储指向本地变量的指针。 cre_triangle()完成后，这些变量会瓦解。使用共享指针或只是按副本存储。

修改其他struct（链表）中定义的struct对象的元素

1 个答案: