C++循環鏈接列表 - 刪除所有節點

Question

我想刪除單循環鏈表中的所有節點。但我得到了以下錯誤：

malloc: *** error for object 0x1005068f0: pointer being freed was not allocated 

以下是功能：

void StudentLinkList::removeAll() { 
    StudentData *traversePointer = this->head; 

    while (this->head != nullptr) { 
     this->head = this->head->getNext(); 
     delete traversePointer; 
     traversePointer = nullptr; 
     traversePointer = this->head; 
     this->size--; 
    } 
} 

我就在這行錯誤：

delete traversePointer; 

我的問題是，爲什麼traversePointer未分配在while循環如錯誤所示？

Answer 1

的同時應該是：

while(this->size){ 

當循環完成，則設置這個 - >頭= nullptr。沒有必要在循環中設置traversePoitner = nullptr。

替代版本（我還沒有證實這還），即不依賴於這個 - >尺寸是正確的，只是名單是圓形：

void StudentLinkList::removeAll() { 
    if(this->head == nullptr) 
     return; 
    StudentData *traversePointer = this->head; 
    StudentData *deletePointer; 
    do{ 
     deletePointer = traversePointer; 
     traversePointer = traversePointer->getNext(); 
     delete deletePointer; 
    }while(traversePointer != this->head); 
    this->head = nullptr; 
    this->size = 0; 
} 

你可能想修正這個錯誤