[英]What's the difference between BAREWORD and *BAREWORD in Perl?
my $childpid = open3(HIS_IN, HIS_OUT, HIS_ERR, $cmd, @args);
my $childpid = open3(*HIS_IN, *HIS_OUT, *HIS_ERR, $cmd, @args);
It seems the above both works for my application. 看来以上两者都适用于我的应用程序。
What's the difference between BAREWORD
and *BAREWORD
in Perl? Perl中的BAREWORD
和*BAREWORD
什么区别?
The meaning of a bareword varies. 裸字的含义各不相同。 Most of the time, a bareword is a function call. 大多数情况下,裸字是函数调用。
sub foo { say "Hello"; }
foo;
Sometimes, it's a string literal. 有时,它是一个字符串文字。
$x{foo} # $x{"foo"}
In yet other circumstances, it produces a typeglob. 在其他情况下,它会产生一个类型的颜色。
print STDOUT "foo"; # print { *STDOUT } "foo";
In this case, 在这种情况下,
open3(HIS_IN, HIS_OUT, HIS_ERR, ...)
is equivalent to 相当于
open3("HIS_IN", "HIS_OUT", "HIS_ERR", ...)
but open3
uses that string as the name of a glob in the caller's package, so the above is functionally equivalent to 但是open3
使用该字符串作为调用者包中glob的名称,因此上面的函数等效于
open3(*HIS_IN, *IS_OUT, *HIS_ERR, ...)
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