Created
January 21, 2015 20:45
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package com.michal | |
trait A[+Self <: A[_]] { | |
def a: Int | |
def b: Int | |
def addToA(plus: Int): Self = makeCopy(a + plus, b) | |
def makeCopy(newA: Int, newB: Int): Self | |
} | |
case class B(a: Int, b: Int) extends A[B] { | |
def makeCopy(a: Int = a, b: Int = b): B = copy(a = a, b = b) | |
def bMethod = s"$a, $b" | |
} | |
case class C(a: Int, b: Int, c: Int) extends A[C] { | |
def makeCopy(a: Int = a, b: Int = b): C = copy(a = a, b = b) | |
def cMethod = s"$a, $b, $c" | |
} | |
object MyApp extends App { | |
println(B(7, 4).makeCopy(a = 3).addToA(7).bMethod) | |
println(C(7, 4, 7).makeCopy(a = 3).addToA(7).cMethod) | |
} |
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