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Kotlin Standard Library

There is a newer version: 2.1.20-Beta1

@file:kotlin.jvm.JvmVersion
@file:kotlin.jvm.JvmMultifileClass
@file:kotlin.jvm.JvmName("PreconditionsKt")
package kotlin

@PublishedApi
internal object _Assertions {
    @JvmField @PublishedApi
    internal val ENABLED: Boolean = javaClass.desiredAssertionStatus()
}

/**
 * Throws an [AssertionError] if the [value] is false
 * and runtime assertions have been enabled on the JVM using the *-ea* JVM option.
 */
@kotlin.internal.InlineOnly
public inline fun assert(value: Boolean) {
    assert(value) { "Assertion failed" }
}

/**
 * Throws an [AssertionError] calculated by [lazyMessage] if the [value] is false
 * and runtime assertions have been enabled on the JVM using the *-ea* JVM option.
 */
@kotlin.internal.InlineOnly
public inline fun assert(value: Boolean, lazyMessage: () -> Any) {
    if (_Assertions.ENABLED) {
        if (!value) {
            val message = lazyMessage()
            throw AssertionError(message)
        }
    }
}