C++ (Qt)
static const char * c_Sentence = QT_TR_NOOP("My Sentence");
MyClass::MyClass() : QObject()
{
      QLabel * label = new QLabel(tr(c_Sentence), this);
} 

C++ (Qt)
static const char *greeting_strings[] = {
     QT_TRANSLATE_NOOP("FriendlyConversation", "Hello"),
     QT_TRANSLATE_NOOP("FriendlyConversation", "Goodbye")
 };
 
 QString FriendlyConversation::greeting(int type)
 {
     return tr(greeting_strings[type]);
 }
 

C++ (Qt)
static const char c_Sentence[] = QT_TRANSLATE_NOOP("MyContext","My Sentence");
MyClass::MyClass() : QObject()
{
   QLabel * label = new QLabel(tr(c_Sentence), this);
}