Perl 调用带有前导“&"的子程序 [英] Perl calling subroutine with leading '&'

问题描述

我时不时地看到 Perl 脚本，其中调用子程序时带有前导&".这是遗产，还是有任何好处?调用不带与号的子程序也能正常工作.

Every now and then I see Perl scripts where subroutines are called with a leading '&'. Is this legacy, or does it give any benefit? As calling the subroutine without the ampersand sign works as well.

sub mysub {
        print "mysub\n"; 

}

mysub;
&mysub;

Thx/赫尔曼

推荐答案

使用 & 调用通常是一种代码味道，有人不知道他们在做什么并且处于 Perl4 思维模式.在您的具体示例中，它的工作原理完全相同.但是，使用 & 调用会禁用函数原型，因此高级用户可能会在某些情况下使用它.在这种情况下，您应该会在呼叫旁边看到为什么注释.

Calling with & is generally a code smell that somebody doesn't know what they're doing and are in a Perl4 mindset. In your specific example, it works exactly the same. However, calling with & disables function prototypes, so advanced users may use it in certain circumstances. You should expect to see a comment why next to the call in that case.

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