什么(有任何)语言只有通过引用传递? [英] What (are there any) languages with only pass-by-reference?

问题描述

我在想.是否有仅使用传递引用作为评估策略的语言?

I was wondering. Are there languages that use only pass-by-reference as their eval strategy?

推荐答案

我不知道什么是评估策略"，但 Perl 子例程调用只是传递引用.

I don't know what an "eval strategy" is, but Perl subroutine calls are pass-by-reference only.

sub change {
    $_[0] = 10;
}

$x = 5;
change($x);
print $x;  # prints "10"
change(0);  # raises "Modification of a read-only value attempted" error

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