特性中的静态函数可以调用相同特性中的另一个静态函数吗？

Question

Can a static function in a trait call another static function in same trait? Suppose I have a trait below:

trait Test {
    fn prt() {
        println!("ok");
    }

    fn test() {
        Test::prt();
    }
}

That doesn't work. Code just can't compile here.

Also, there is no type for me to use fully qualified syntax like <T as Test>::Test . Is there another way to do this?

Answer 1

Inside a trait definition, you can use Self to refer to the type which implements the trait. For you, that would look like:

trait Test {
    fn prt() {
        println!("ok");
    }

    fn test() {
        Self::prt();
    }
}

There really is no such method as Test::test because its body is always defined by implementations of the trait. It just so happens that implementors will get that body by default if they don't provide their own.