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/*
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.rxjava3.operators;

import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.functions.Supplier;

/**
 * A marker interface indicating that a scalar, constant value
 * is held by the implementing reactive type which can be
 * safely extracted during assembly time can be used for
 * optimization.
 * 
 * Implementors of {@link #get()} should not throw any exception.
 * 

 * Design note: the interface extends {@link Supplier} because if a scalar
 * is safe to extract during assembly time, it is also safe to extract at
 * subscription time or later. This allows optimizations to deal with such
 * single-element sources uniformly.
 * 
 * @param  the scalar value type held by the implementing reactive type
 * @since 3.1.1
 */
@FunctionalInterface
public interface ScalarSupplier<@NonNull T> extends Supplier {

    // overridden to remove the throws Throwable
    @Override
    T get();
}