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";
};