pass "this" as parameter

[jacek]

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
 
  // set background and size it correctly
  ( this )->resize( 569, 458 );

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
    
  // set background and size it correctly
  ( this )->resize( 569, 458 );

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You don't have to use "this" in above code. You can simply write:

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
 
  // set background and size it correctly
  resize( 569, 458 );

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
    
  // set background and size it correctly
  resize( 569, 458 );

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What is the the type of "this" ?

In this case "this" is this: ApplicationWindow*