each

来自「C实现的MUD,对大家基本入门网络游戏很有帮助!」· 代码 · 共 39 行

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          each() - iterate over the (key, value) pairs in a mapping

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          mixed *each( mapping m, int reset );

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          The (key, value) pairs in a mapping may be iterated over
          using the each() efun.  each() returns the (key, value)
          pairs in the same order as keys() and values() do.  each()
          returns a null vector when the end of the mapping is
          reached.  The next access to each() (after receiving the
          null vector) will start over at the beginning of the map.
          The current position in the map always resets to the
          beginning when a different object accesses the map via
          each().  Given the singlethreaded nature of MudOS, this
          doesn't present a problem (and in fact makes sure that an
          object can't leave the current position in an in-between
          state).  If the optional second argument is given as 1, then
          each()'s position in mapping `m' is reset to the beginning.

          For example:

               mixed *pair;

               while ((pair = each(x)) != ({})) {
                 write("key   = " + pair[0] + "\n");
                 write("value = " + pair[1] + "\n");
               }

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          keys(3), values(3)

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