Code/net/minecraft/world/inventory/DataSlot.java

package net.minecraft.world.inventory;

public abstract class DataSlot {
    private int prevValue;

    public static DataSlot forContainer(final ContainerData p_39404_, final int p_39405_) {
        return new DataSlot() {
            @Override
            public int get() {
                return p_39404_.get(p_39405_);
            }

            @Override
            public void set(int p_39416_) {
                p_39404_.set(p_39405_, p_39416_);
            }
        };
    }

    public static DataSlot shared(final int[] p_39407_, final int p_39408_) {
        return new DataSlot() {
            @Override
            public int get() {
                return p_39407_[p_39408_];
            }

            @Override
            public void set(int p_39424_) {
                p_39407_[p_39408_] = p_39424_;
            }
        };
    }

    public static DataSlot standalone() {
        return new DataSlot() {
            private int value;

            @Override
            public int get() {
                return this.value;
            }

            @Override
            public void set(int p_39429_) {
                this.value = p_39429_;
            }
        };
    }

    public abstract int get();

    public abstract void set(int p_39402_);

    public boolean checkAndClearUpdateFlag() {
        int i = this.get();
        boolean flag = i != this.prevValue;
        this.prevValue = i;
        return flag;
    }
}