perl – 为什么我不能通过typeglob访问词法变量?
发布时间:2020-12-16 06:06:33 所属栏目:大数据 来源:网络整理
导读:我不明白为什么下面的例子失败了(测试2).为什么我无法从* bb glob访问变量bb? use Test::More tests = 4;$aa = 1;my $bb = 2; # HERE!local $cc = 3;our $dd = 4;is(${*aa},1,"$*aa should be 1");is(${*bb},2,"$*bb (my) should be 2");is(${*cc},3,"$*
我不明白为什么下面的例子失败了(测试2).为什么我无法从* bb glob访问变量bb?
use Test::More tests => 4; $aa = 1; my $bb = 2; # HERE! local $cc = 3; our $dd = 4; is(${*aa},1,"$*aa should be 1"); is(${*bb},2,"$*bb (my) should be 2"); is(${*cc},3,"$*cc (local) should be 3"); is(${*dd},4,"$*dd (our) should be 4"); 输出是 1..4 ok 1 - *aa should be 1 # Failed test '*bb (my) should be 2' # at untitled line 10. # got: undef # expected: '2' # Looks like you failed 1 test of 4. not ok 2 - *bb (my) should be 2 ok 3 - *cc (local) should be 3 ok 4 - *dd (our) should be 4 根据perl 5.16.0 谢谢 解决方法
词法变量(使用my创建的变量)不是符号表的一部分,因此无法通过globs访问它们.另见
Of Symbol Tables and Globs.
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