Thus you can build up a list of pointers to member-functions of arbitrary classes and call them all through the same interface without bothering about their class or the need of a pointer to an instance . All the functions just have got to have the same return-type and calling parameters. Sometimes functors are also known as closures. Often functors are used to implement callbacks. It highlights almost everything, is very fast and lets the user edit the highlighting styles via a graphical preview interface.
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