throw

C实现的MUD,对大家基本入门网络游戏很有帮助!

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          throw() - forces an error to occur in an object.

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          void throw(mixed);

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          The throw() efun may be used to force an error to occur in
          an object.  When used in conjunction, throw() and catch()
          allow the programmer to choose what error message is
          displayed when a runtime error occurs.  When throw() is
          used, it should be used in conjunction with the catch(3)
          efun.  Here is a typical usage:

             string err;
             int rc;

             err = catch(rc = ob->move(dest));
             if (err) {
                  throw("move.c: ob->move(dest): " + err + "\n");
                  return;
             }

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          catch(3), error(3), error_handler(4)

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