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It seems I'm unable to use a method reference of an object in Kotlin. This feature exists in Java.
For example in Java if I was looping through a string to append each character to a writer:
string.forEach(writer::append);
But in Kotlin using the same syntax does not work because:
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The method references can only be used to replace a single method of the lambda expression. A code is more clear and short if one uses a lambda expression rather than using an anonymous class and one can use method reference rather than using a single function lambda expression to achieve the same.
:: converts a Kotlin function into a lambda. this translates to MyClass(x, y) in Kotlin.
A function reference is typically used to pass an expression or set of instructions from one part of your code to another. There are a few other ways to accomplish this in Kotlin.
For now, Kotlin only supports references to top-level and local functions and members of classes, not individual instances. See the docs here.
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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