C ++使用指针帮助警告

Question

i need return the name of object, the pointer cabezera pointing to the object, but when run in the console print a warning 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);

在不知道构造函数真正的外观的情况下，在这种情况下，您尝试取消引用尚未分配值的可乐，因此会出现分段错误（技术上未定义的行为，但在99％的时间内出现分段错误） ）。