C ++的使用Moose与Perl的OOP

问题描述

我一直在和麋鹿一起玩，得到一个感觉。我想要一个纯虚拟函数的例子，如C ++，但在Moose语法（特别是在C ++看起来的方式）。我知道即使Moose强加一个比普通Perl更严格的模型，仍然有不止一种方式来做我要求的（通过方法修饰符或 SUPER :: 调用） 。这就是为什么我要求具体的类似于C ++的实现尽可能多。至于为什么？的这个限制？主要是好奇心，但也计划以C ++为中心的人可以大多以

I've been playing around with Moose, getting a feel for it. I'd like an example of pure virtual functions like in C++ but in Moose parlance (specifically in a C++-looking way). I know that even with Moose imposing a stricter model than normal Perl, there's still more than one way to do what I'm asking (via method modifiers or SUPER:: calls). That is why I'm asking specifically for an implementation resembling C++ as much as possible. As for the "why?" of this restriction? Mostly curiosity, but also planning to port some C++ code to Perl with Moose in a way that C++-centric people could mostly identify with.

推荐答案

我可以这样使用角色而不是子类化：

I can think of this way using roles instead of subclassing:

{
    package AbstractRole;
    use Moose::Role;
    requires 'stuff';  
}

{
    package Real;
    use Moose;
    with 'AbstractRole';
}

这将给出一个编译错误，因为Real没有 stuff

This will give a compilation error because Real doesn't have stuff defined.

向Real添加 方法现在可以使其正常工作：

Adding stuff method to Real will now make it work:

{
    package Real;
    use Moose;
    with 'AbstractRole';

    sub stuff { print "Using child function!\n" }
}

b $ b

/ I3az /

/I3az/

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