C ++通过指针帮助发出警告

Question

我需要返回对象的名称，指向cabezera的指针指向对象，但是当在控制台中运行时会打印出警告Segmentation fault。

cancion *cola;
cancion *cabezera = new cancion("ca","name","cab","cab","cab","cab","cab",*cola,*cabezera);
cola = new cancion("cola", "cola", "cola", "cola", "cola", "cola", "cola", *cabezera, *cola);


cancion *tmp1 = new cancion ("1","1","1","1","1","1","1",*cabezera, *cola); 
cancion *tmp = new cancion ("1","1","1","1","1","1","1",*cabezera, *cola);
string entrega = "";
tmp1 = cabezera;
entrega = tmp1->getID(); //getID() return a string.
cout<<entrega<<endl;

Answer 1

cancion *cabezera = new cancion("ca","name","cab","cab","cab","cab","cab",*cola,*cabezera);

在不知道构造函数实际看起来是什么样的情况下，在这种情况下，您试图取消引用未被赋值的cola，因此会给您一个分段错误（技术上未定义的行为，但是> 99％的时间分段错误。）