Requesting an instance of a Qt object

Question

QObject *obj;
...
if ( /* obj is already instantiated */ ) {
    ;
} else {
    obj = new QObject();
}

My query is an if condition

+3

Dewsworld 03 Apr At 14:38

3 answers

QObject *obj = 0;

// ...

if (!obj) obj = new QObject();

Note. Does not guarantee that obj

it is not a dangling pointer .

0

Samuel harmer 03 Apr 12 at 14:48

Whenever you call deleteLater();

it sets the value to 0 than you can check.

QPointer<QWidget> someWidget = 0;

0

Rafael Oliveira 14 jan. 14 at 21:38

Chris · Accepted Answer · 2012-04-03T14:42:38+0000

1) Initialize a pointer to a NULL object

2) Check for null value in statement if

QObject *obj = NULL;
...
if ( obj != NULL ) {
    ;
} else {
    obj = new QObject();
}