QMap

[sophister]

I use this, but the application crashed:

QMap<QString, QToolButton *> *currentButtons = const_cast<QMap<QString, QToolButton *>*>(tabs.value(ui->tabWidget->currentIndex()));
currentButtons->insert(path, btn);        //This line is where the error lie

QMap<QString, QToolButton *> *currentButtons = const_cast<QMap<QString, QToolButton *>*>(tabs.value(ui->tabWidget->currentIndex()));
currentButtons->insert(path, btn);        //This line is where the error lie

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I am really puzzled.
Did I fail to const_cast the const into non-cosnt so that I cannot insert a value into a const variable??