clear qlist inside qmap

Hello,

If you have QMap of QList's like this

Code:

---

QMap<int,QList<int> > myMap;
myMap.insert(a,QList<int>())
myMap[a].append(b);
myMap[a].append(c);

---

and you clear QMap:

Code:

---

myMap.clear()

---

are elements of inner QList cleared, or you should iterate through QMap first and clear QLlist ?

best regards
Marek

The lists are cleared as well.

More precisely: each map element is deconstructed, the QList destructor clears the list.

Cheers,
_

Hi,

What if elements of inner QList, or values of inner QMap are created with "new" operator like this

Code:

---

struct SomeStruct {
....
}
QMap<int,QList<SomeStruct*> > myMap;
 
SomeStruct *s1=new SomeStruct;
SomeStruct *s2=new SomeStruct;
 
myMap[a].append[s1];
myMap[a].append[s2];
..............
myMap.clear();

---

So in inner map i have in fact pointers to structure, or to other objects created with "new". Is there "delete" called for each object created with "new" ?

best regards
Marek

No, the list clears its contents and the content is pointers, not objects behind them. You can use qDeleteAll() to clear objects behind the pointers:

Code:

---

QList<SomeStruct*> list;
// ...
 
qDeleteAll(list);

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