untie

描述 (Description)

此函数打破变量和包之间的绑定，撤消tie函数创建的关联。

语法 (Syntax)

以下是此函数的简单语法 -

untie VARIABLE

返回值 (Return Value)

此函数在失败时返回0，在成功时返回1。

例子 (Example)

以下是显示其基本用法的示例代码 -

#!/usr/bin/perl -w
package MyArray;
sub TIEARRAY {
   print "TYING\n";
   bless [];
}
sub DESTROY {
   print "DESTROYING\n";
}
sub STORE {
   my ($self, $index, $value ) = @_;
   print "STORING $value at index $index\n";
   $self[$index] = $value;
}
sub FETCH {
   my ($self, $index ) = @_;
   print "FETCHING the value at index $index\n";
   return $self[$index];
}
package main;
$object = tie @x, MyArray; #@x is now a MyArray array;
print "object is a ", ref($object), "\n";
$x[0] = 'This is test'; #this will call STORE();
print $x[0], "\n";      #this will call FETCH();
print $object->FETCH(0), "\n";
untie @x    		#now @x is a normal array again.

执行上述代码时，会产生以下结果 -

TYING
object is a MyArray
STORING This is test at index 0
FETCHING the value at index 0
This is test
FETCHING the value at index 0
This is test
DESTROYING