@protected是否有@friend功能？
我正在使用DART注释@protected，因为我想将成员限制为仅从单个其他类中调用，例如，
class Foo {
@protected
void doSomethingSpecial() {}
}
class Bar {
final foo = Foo();
consumeDoSomethingSpecial() {
foo.doSomethingSpecial();
}
}
可以理解的是，foo.dosomethingspecial（） triggers 在C ++世界中，我会注释
The member 'doSomethingSpecial' can only be used within instance members of subclasses...
栏作为foo的friend允许此通话，但我没有看到DART中的等效注释吗？
添加上方来抑制警告，但是我没有看到适用于使用@protected注释的皮棉规则吗？
// ignore: the_appropriate_lint_rule
我确实看到我可以通过在警告上
I'm using the Dart annotation @protected because I want to limit a member to only be called from a single other class, like so
class Foo {
@protected
void doSomethingSpecial() {}
}
class Bar {
final foo = Foo();
consumeDoSomethingSpecial() {
foo.doSomethingSpecial();
}
}
Understandably, foo.doSomethingSpecial() triggers the warning
The member 'doSomethingSpecial' can only be used within instance members of subclasses...
In the C++ world I would annotate Bar as a friend of Foo to permit this call but I'm not seeing the equivalent annotation in Dart?
I did see that I can suppress a warning by adding
// ignore: the_appropriate_lint_rule
above the line with the warning but I'm not seeing a lint rule that applies to using the @protected annotation?
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DART中的“朋友”基本上是通过确保标识符为“图书馆 - 局部”（从下划线开始）来实现的，并且所有朋友都在同一库中。 DART中的库通常只是一个文件。但是，使用部分/部分可以跨越多个文件。
任何对下划线假定标识符的引用是同一库的范围内，但即使您导入该文件，也不在其他任何地方的范围。
"friend" in Dart is essentially implemented by ensuring that the identifiers are "library-local" (begin with underscore), and all friends are in the same library. A library in Dart is typically just a single file; however, using part/part-of, it can span multiple files.
Any reference to an underscore-prefixed identifier is in-scope for the same library, but out of scope anywhere else, even if you import that file.