doubt with this qt's code

**Gopala Krishna** · 24th February 2007, 11:42

When I was going through source of qt4.2 I was just pulled by the implementation of 'foreach' esp for compilers without typeof method.
But I just couldn't understand as to why ternary operators are used when 0 could have been used directly. Am I missing something ? Can someone enlighten me ?

Qt Code:

Switch view

#define Q_FOREACH(variable, container) \
    for (const QForeachContainerBase &_container_ = qForeachContainerNew(container); \
         qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->condition();       \
         ++qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->i)               \
        for (variable = *qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->i; \
             qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->brk;           \
             --qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->brk)
 
#endif

#define Q_FOREACH(variable, container) \
    for (const QForeachContainerBase &_container_ = qForeachContainerNew(container); \
         qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->condition();       \
         ++qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->i)               \
        for (variable = *qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->i; \
             qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->brk;           \
             --qForeachContainer(&_container_, true ? 0 : qForeachPointer(container))->brk)

#endif

To copy to clipboard, switch view to plain text mode