perl – 我怎样才能重新定义子程序并保留旧程序?
发布时间:2020-12-15 21:52:51 所属栏目:大数据 来源:网络整理
导读:这就是我想要实现的目标: sub first { print "this is original first";}*original_first = first;sub first { print "this is first redefined";}original_first(); # i expect this to print "this is original first"first() # i expect this to print
这就是我想要实现的目标:
sub first { print "this is original first"; } *original_first = &;first; sub first { print "this is first redefined"; } original_first(); # i expect this to print "this is original first" first() # i expect this to print "this is first redefined" 我认为通过首先保存符号,我以后可以调用原始子程序(名称为original_first)并且也可以先调用,然后重新定义.但是,如果我调用original_first,我仍然会得到“这是第一次重新定义”.我需要做些什么来完成这项工作? 解决方法
这应该按预期工作:
sub first { print "this is original first"; } *original_first = &;first; *first = sub { print "this is first redefined"; }; (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |