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   if(mLastUndoIndex == mLastRedoIndex && !mRedoingAnUndo)
   {
   saveUndoState();
   mLastUndoIndex--;
   mLastRedoIndex--;
   mRedoingAnUndo = true;
   }
 
   mUndoStep[mLastUndoIndex % UNDO_STATES]->undo(mEditorDatabase, false); // changes mEditorDatabase to istit last version
 
   GridDatabase *database = getDatabase();
   mLoadTarget = database;
 
   rebuildEverything(database); // Well, rebuild segments from walls at least
 
   onSelectionChanged();

prog.cpp:1:4: error: expected unqualified-id before ‘if’
    if(mLastUndoIndex == mLastRedoIndex && !mRedoingAnUndo)
    ^
prog.cpp:9:4: error: ‘mUndoStep’ does not name a type
    mUndoStep[mLastUndoIndex % UNDO_STATES]->undo(mEditorDatabase, false); // changes mEditorDatabase to istit last version
    ^
prog.cpp:11:4: error: ‘GridDatabase’ does not name a type
    GridDatabase *database = getDatabase();
    ^
prog.cpp:12:4: error: ‘mLoadTarget’ does not name a type
    mLoadTarget = database;
    ^
prog.cpp:14:21: error: expected constructor, destructor, or type conversion before ‘(’ token
    rebuildEverything(database); // Well, rebuild segments from walls at least
                     ^
prog.cpp:16:24: error: expected constructor, destructor, or type conversion before ‘;’ token
    onSelectionChanged();
                        ^

Standard output is empty