Just allocate it on the stack:
Qt Code:
  1. twmMainWindow mytwmMainWindow(); // <-- trm.cpp:62
  2. mytwmMainWindow.show();
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or alternatively set Qt::WA_CloseOnDelete attribute:
Qt Code:
  1. twmMainWindow *mytwmMainWindow = new twmMainWindow(); // <-- trm.cpp:62
  2. mytwmMainWindow->setAttribute(Qt::WA_DeleteOnClose);
  3. mytwmMainWindow->show();
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