Replacing RESTORE() macro with template functions.

[Marc Mutz]

Hi!

RESTORE() has the drawback that it can only be used with a single type 
of mainwindow. ATM, I'm not sure if you can overload cpp macros w.r.t. 
the number of arguments, but even if you could, they'd still be 
_macros_ (bah! :-).

It also has the drawback that it fails for namespaced mainwindows:

#include "mainwindow.h"
using myApp::MainWindow;

int main( int, char** ) {
  //...
  if ( kapp->isRestored() )
    RESTORE(MainWindow); // fails
  else
    // ...
  // ...
}

Here's an alternative that should be BC and SC and with which the above 
should work:

#define RESTORE(type) kRestoreMainWindows<type>();

template <typename T1>
static inline kRestoreMainWindows() {
  for ( int n = 1 ; KMainWindow::canBeRestored( n ) ; ++n )
    if ( T1::staticMetaObject()->className()
         == KMainWindow::classNameOfTopLevel( n ) )
      (new T1)->restore( n );
}

template <typename T1, typename T2>
static inline kRestoreMainWindows() {
  for ( int n = 1 ; KMainWindow::canBeRestored( n ) ; ++n )
    if ( T1::staticMetaObject()->className()
         == KMainWindow::classNameOfTopLevel( n ) )
      (new T1)->restore( n );
    else if ( T2::staticMetaObject()->className()
              == KMainWindow::classNameOfTopLevel( n ) )
      (new T2)->restore( n );
}

template <typename T1, typename T2, typename T3>
static inline kRestoreMainWindows() {
  for ( int n = 1 ; KMainWindow::canBeRestored( n ) ; ++n )
    if ( T1::staticMetaObject()->className()
         == KMainWindow::classNameOfTopLevel( n ) )
      (new T1)->restore( n );
    else if ( T2::staticMetaObject()->className()
              == KMainWindow::classNameOfTopLevel( n ) )
      (new T2)->restore( n );
    else if ( T3::staticMetaObject()->className()
              == KMainWindow::classNameOfTopLevel( n ) )
      (new T3)->restore( n );
}

#define KDE_MAX_KRESTORE_MAINWINDOWS_TEMPLATE_ARGS 3

// etc.. If an app author needs more, he can say so and we'd add it for 
the next release while she does:

  if ( kapp->isRestored() ) {
#if defined(KDE_MAX_KRESTORE_MAINWINDOWS_TEMPLATE_ARGS) && \ 
KDE_MAX_KRESTORE_MAINWINDOWS_TEMPLATE_ARGS >= 5
    kRestoreMainWindows<myWin1,myWin2,myWin3,myWin4,myWin5>();
#else
    //.. do it by hand
#endif
  } else {
    //...
  }

Marc

-- 
memAlloc() Amnesia Error: Out of Memory
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