为什么Ordered[A]使用compare方法而不是重用compareTo？
trait Ordered[A] extends java.lang.Comparable[A] {
def compare(that: A): Int
def < (that: A): Boolean = (this compare that) < 0
def > (that: A): Boolean = (this compare that) > 0
def <= (that: A): Boolean = (this compare that) <= 0
def >= (that: A): Boolean = (this compare that) >= 0
def compareTo(that: A): Int = compare(that)
}
同时拥有 compare 和 compareTo 是不是有点没用？ 我在这里缺少的巨大好处是什么？
如果他们刚刚使用了 compareTo，我只需在代码中将 Comparable 替换为 Ordered 就可以了。
trait Ordered[A] extends java.lang.Comparable[A] {
def compare(that: A): Int
def < (that: A): Boolean = (this compare that) < 0
def > (that: A): Boolean = (this compare that) > 0
def <= (that: A): Boolean = (this compare that) <= 0
def >= (that: A): Boolean = (this compare that) >= 0
def compareTo(that: A): Int = compare(that)
}
Isn't it a bit useless to have both compare and compareTo?
What is the huge benefit I'm missing here?
If they had just used compareTo I could just had replaced Comparable with Ordered in my code and be done.
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我认为这是一次历史性事故。
Ordered最初并不是继承自Comparable。一旦完成，compare名称就已经建立了。I think it's a historic accident.
Orderedoriginally did not inherit fromComparable. Once it did, thecomparename was already established.我假设 Scala 库的作者更喜欢compare()这个名字。
I assume the authors of the Scala libraries just prefer the name compare().