virtualp

C实现的MUD,对大家基本入门网络游戏很有帮助!

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          virtualp() - determine whether a given variable points to a
          virtual object

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          int virtualp( object arg );

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          Returns true (1) if the argument is objectp() and the
          O_VIRTUAL flag is set.  The driver sets the O_VIRTUAL flag
          for those objects created via the

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          clonep(3), userp(3), wizardp(3), objectp(3), new(3),
          clone_object(3), call_other(3), file_name(3)

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