What's the purpose of `qt_noop`

c++, no-op, qt

Solution

The "`noop`" name is short for "no operation", meaning it is a place-holder function that does nothing.

You may also know `NOP`, which exists in assembly-language.

I know it's used internally in some macros that should do something only for debug builds, for example:

#  ifndef QT_NO_DEBUG
#    define Q_ASSERT(cond) ((!(cond)) ? qt_assert(#cond,__FILE__,__LINE__) : qt_noop())
#  else
#    define Q_ASSERT(cond) qt_noop()
#  endif
#endif

Problem

I just found the existence of `qt_noop()` define in the qglobal.h as: ``` inline void qt_noop() {} ``` What's the point of it?

Original source