org.jetbrains.kotlin.contracts.model.functors.FunctorsUtils.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.contracts.model.functors
/**
* Applies [operation] to [first] and [second] if both not-null, otherwise returns null
*/
internal fun applyIfBothNotNull(first: F?, second: S?, operation: (F, S) -> R): R? =
if (first == null || second == null) null else operation(first, second)
/**
* If both [first] and [second] are null, then return null
* If only one of [first] and [second] is null, then return other one
* Otherwise, return result of [operation]
*/
internal fun applyWithDefault(first: F?, second: S?, operation: (F, S) -> R): R? = when {
first == null && second == null -> null
first == null -> second
second == null -> first
else -> operation(first, second)
}