org.jetbrains.kotlin.backend.common.serialization.encodings.BinaryTypeProjection.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.backend.common.serialization.encodings
import org.jetbrains.kotlin.types.Variance
inline class BinaryTypeProjection(val code: Long) {
private fun varianceId(): Int = (code and 0x3L).toInt() - 1
val isStarProjection: Boolean get() = code == 0L
val variance: Variance
get() {
assert(!isStarProjection)
return Variance.values()[varianceId()]
}
val typeIndex: Int get() = (code ushr 2).toInt()
companion object {
fun encodeType(variance: Variance, typeIndex: Int): Long {
val vId = variance.ordinal + 1
return (typeIndex.toLong() shl 2) or vId.toLong()
}
fun decode(code: Long) = BinaryTypeProjection(code)
const val STAR_CODE = 0L
}
}