Perl untie 函数
描述
此函数打破变量和包之间的绑定，撤消由 tie 函数创建的关联。
语法
以下是此函数的简单语法 −
untie VARIABLE
返回值
此函数在失败时返回 0，在成功时返回 1。
示例
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
