if I type ```override fun equals(other: Any?): Boo...

# announcements

[elect]

if I type

override fun equals(other: Any?): Boolean = when(other) {
        this -> true

will other checked using == or === ?

[Marko Mitic]

if it doesn't return, it's ==

[Jonathan Mew]

@Test
    fun testOther() {
        class Test {
            override fun equals(other: Any?): Boolean {
                return true
            }
        }

        val t1 = Test()
        val t2 = Test()

        Test().equals(Test()) shouldBe true
        (Test() === Test()) shouldBe false

        val maybe = when (t1) {
            t2 -> "yes"
            else -> "no"
        }

        println(maybe)
    }

yes

[elect]

I cant test it yet, I'm in the middle of a port

[elect]

isnt there a way to force structural equality then unless typing explicitely other === this

[Marko Mitic]

StackOverflowError

[Marko Mitic]

uses ==

[tseisel]

How about :

override fun equals(other: Any?): Boolean = when {
    other === this -> true
    // Check the type, then the equality of each properties
}

Also, why not using a data class ? equals and hashcode are implemented automatically by the compiler.

[elect]

it's a port from C#, I'd like to keep it as closest as possible, data class is out because of this

[elect]

(the equals is actually more complex than what I shown)

[karelpeeters]

Do you want `equals`/`==to be the same as===`?

[elect]

no, I wanted to know if I could use somehow structural equality if I had when(value)

[karelpeeters]

Then you'll need to do what @tseisel says.