Ivan Kylchik
60 lines
1.7 KiB
Kotlin
Vendored
60 lines
1.7 KiB
Kotlin
Vendored
@CompileTimeCalculation
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open class A
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class B @CompileTimeCalculation constructor() {
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@CompileTimeCalculation
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override fun hashCode(): Int {
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return super.hashCode()
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}
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}
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class C
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class D : A()
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@CompileTimeCalculation
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fun checkHashCodeCorrectness(value: Any): Boolean {
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val hashCode = value.hashCode()
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return hashCode.toHex().length == 8 && hashCode == value.hashCode()
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}
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@CompileTimeCalculation
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fun getTheSameValue(a: Any): Any = a
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@CompileTimeCalculation
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fun theSameObjectHashCode(value: Any): Boolean {
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return value.hashCode() == getTheSameValue(value).hashCode()
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}
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@CompileTimeCalculation
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fun Int.toHex(): String {
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val sb = StringBuilder()
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val hexDigits = charArrayOf(
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
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)
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var value = this
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var i = 8
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while (i > 0) {
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i -= 1
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val j = value.and(0x0F)
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sb.append(hexDigits[j])
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value = value.shr(4)
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}
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return sb.reverse().toString()
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}
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const val aHashCode = <!EVALUATED: `true`!>checkHashCodeCorrectness(A())<!>
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const val bHashCode = <!EVALUATED: `true`!>checkHashCodeCorrectness(B())<!>
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val cHashCode = C().hashCode() // must not be calculated
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val dHashCode = D().hashCode() // must not be calculated
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const val arrayHashCode = <!EVALUATED: `true`!>checkHashCodeCorrectness(arrayOf(A(), B()))<!>
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const val intArrayHashCode = <!EVALUATED: `true`!>checkHashCodeCorrectness(arrayOf(1, 2, 3))<!>
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const val checkA = <!EVALUATED: `true`!>theSameObjectHashCode(A())<!>
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const val checkStringBuilder1 = <!EVALUATED: `true`!>theSameObjectHashCode(StringBuilder())<!>
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const val checkStringBuilder2 = <!EVALUATED: `true`!>theSameObjectHashCode(StringBuilder("Some Builder"))<!>
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