Kotlin:方法引用不起作用? [英] Kotlin: Method reference not working?

问题描述

似乎我无法在Kotlin中使用对象的方法引用. Java中存在此功能.

It seems I'm unable to use a method reference of an object in Kotlin. This feature exists in Java.

例如，在Java中，如果我遍历字符串以将每个字符附加到编写器:

For example in Java if I was looping through a string to append each character to a writer:

string.forEach(writer::append);

但是在Kotlin中，使用相同的语法不起作用是因为:

But in Kotlin using the same syntax does not work because:

推荐答案

Kotlin目前仅支持对顶级和本地函数以及 classs 成员的引用，而不支持单个实例.请在此处参阅文档.

For now, Kotlin only supports references to top-level and local functions and members of classes, not individual instances. See the docs here.

因此，您可以说Writer::append并获得函数Writer.(Char) -> Writer，但是目前不支持采用writer实例并说writer::append以获得函数(Char) -> Writer.

So, you can say Writer::append and get a function Writer.(Char) -> Writer, but taking a writer instance and saying writer::append to get a function (Char) -> Writer is not supported at the moment.

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