Bad Pointer Doubly Link List

[sengoku]

In the tutoiral im using it has ask for me to create a doubly link list however I am geetting a bad pointer runtime error.

#include <string>
#include <iostream>

using namespace std;

typedef string DataT;

struct link;

struct link{
	struct link *next;
	struct link *prev;
	DataT data;
};

struct list{
	struct link *head;
};

typedef struct link LinkT;
typedef struct list StrLLT;
typedef struct link *Iter;

StrLLT *Cons(void){
	StrLLT *tempList;

	tempList = (StrLLT*)malloc(sizeof(StrLLT));
	tempList->head = (LinkT*)malloc(sizeof(LinkT));
	tempList->head->next = NULL;
	tempList->head->prev = NULL;
	tempList->head->data = "sr"; //Offending Line of Code
	return tempList;
};

[Abramus]

The problem is you are allocating LinkT object using malloc. This is wrong as LinkT contains member of type std::string, which will not be properly constructed because malloc only allocates raw memory, it doesn’t create objects. Use 'new' instead.