compose/runtime/src/main/java/androidx/compose/IntStack.kt

/*
 * Copyright 2019 The Android Open Source Project
 *
 * 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 androidx.compose

internal class IntStack {
    private var slots = IntArray(10)
    private var tos = 0

    val size: Int get() = tos

    fun push(value: Int) {
        if (tos >= slots.size) {
            slots = slots.copyOf(slots.size * 2)
        }
        slots[tos++] = value
    }

    fun pop(): Int = slots[--tos]
    fun peek() = slots[tos - 1]
    fun peek(index: Int) = slots[index]
    fun isEmpty() = tos == 0
    fun isNotEmpty() = tos != 0
    fun clear() { tos = 0 }
}