tie制定函數(shù)的變量傳遞機(jī)制: 哪位高手解釋一下

xnkjdx1998

#!/usr/bin/perl
package Centsible;
sub TIESCALAR { bless \my $self, shift }
sub STORE { ${ $_[0] } = $_[1] }  # do the default thing
sub FETCH { sprintf "%.02f", ${ my $self = shift } } # round value

package main;
tie $bucks, "Centsible";
$bucks = 45.00;
$bucks *= 1.0715; # tax
$bucks *= 1.0715; # and double tax!
print "That will be $bucks, please.\n";


不是很清楚 STORE/FETCH 函數(shù)參數(shù)的傳遞機(jī)制，哪位高手解釋解釋？
謝謝

zhlong8

FETCH this
This method will be triggered every time the tied variable is accessed (read). It takes no arguments beyond its self reference, which is the object representing the scalar we're dealing with.

STORE this, value
This method will be triggered every time the tied variable is set (assigned). Beyond its self reference, it also expects one (and only one) argument: the new value the user is trying to assign.

perltie 說的很清楚啊，唯一需要注意的是第一個參數(shù)是 bless 過的 object 而不是你 tie 的這個變量

xnkjdx1998

謝謝LS，
明白了