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Immutable Clojure collections and a Transformation abstraction for Java 8+, immutably, type-safely, and with good performance.

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// Copyright 2016 PlanBase Inc. & Glen Peterson
//
// 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.organicdesign.fp.collections;

/**
 Interface for mutable (hash) set builder.
 */
public interface MutableSet extends BaseSet {

    /** Returns an immutable version of this immutable set. */
    ImSet immutable();

    /** {@inheritDoc} */
    @Override
    MutableSet put(E val);

    /** {@inheritDoc} */
    @Override default MutableSet union(Iterable iter) {
        return concat(iter).toMutableSet();
    }

    /** {@inheritDoc} */
    @Override
    MutableSet without(E key);
}