TED and Qt5

void replaceTabWidgetWidget( QTabWidget *tabWidget,int index,QWidget *widget );

In file included from mainwindow.h:12:0,
                 from main.cpp:2:
std.h:51:30: error: variable or field 'replaceTabWidgetWidget' declared void
std.h:51:30: error: 'QTabWidget' was not declared in this scope
std.h:51:42: error: 'tabWidget' was not declared in this scope
std.h:51:52: error: expected primary-expression before 'int'
std.h:51:70: error: expected primary-expression before '*' token
std.h:51:71: error: 'widget' was not declared in this scope

void replaceTabWidgetWidget( QTabWidget *tabWidget,int index,QWidget *widget ){
    int curr=tabWidget->currentIndex();
    QIcon icon=tabWidget->tabIcon( index );
    QString text=tabWidget->tabText( index );
    tabWidget->removeTab( index );
    tabWidget->insertTab( index,widget,icon,text );
    tabWidget->setCurrentIndex( curr );
    return;
}