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diff --git a/src/mongo/db/ops/modifier_add_to_set.h b/src/mongo/db/ops/modifier_add_to_set.h
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--- a/src/mongo/db/ops/modifier_add_to_set.h
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@@ -1,86 +0,0 @@
-/**
- * Copyright (C) 2013 10gen Inc.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * As a special exception, the copyright holders give permission to link the
- * code of portions of this program with the OpenSSL library under certain
- * conditions as described in each individual source file and distribute
- * linked combinations including the program with the OpenSSL library. You
- * must comply with the GNU Affero General Public License in all respects for
- * all of the code used other than as permitted herein. If you modify file(s)
- * with this exception, you may extend this exception to your version of the
- * file(s), but you are not obligated to do so. If you do not wish to do so,
- * delete this exception statement from your version. If you delete this
- * exception statement from all source files in the program, then also delete
- * it in the license file.
- */
-
-#pragma once
-
-
-#include "mongo/base/disallow_copying.h"
-#include "mongo/bson/mutable/document.h"
-#include "mongo/db/field_ref.h"
-#include "mongo/db/ops/modifier_interface.h"
-
-namespace mongo {
-
-class CollatorInterface;
-class LogBuilder;
-
-class ModifierAddToSet : public ModifierInterface {
- MONGO_DISALLOW_COPYING(ModifierAddToSet);
-
-public:
- ModifierAddToSet();
- virtual ~ModifierAddToSet();
-
- /** Goes over the array item(s) that are going to be set- unioned and converts them
- * internally to a mutable bson. Both single and $each forms are supported. Returns OK
- * if the item(s) are valid otherwise returns a status describing the error.
- */
- virtual Status init(const BSONElement& modExpr, const Options& opts, bool* positional = NULL);
-
- /** Decides which portion of the array items that are going to be set-unioned to root's
- * document and fills in 'execInfo' accordingly. Returns OK if the document has a
- * valid array to set-union to, othwise returns a status describing the error.
- */
- virtual Status prepare(mutablebson::Element root, StringData matchedField, ExecInfo* execInfo);
-
- /** Updates the Element used in prepare with the effects of the $addToSet operation. */
- virtual Status apply() const;
-
- /** Converts the effects of this $addToSet into one or more equivalent $set operations. */
- virtual Status log(LogBuilder* logBuilder) const;
-
- virtual void setCollator(const CollatorInterface* collator);
-
-private:
- // Access to each component of fieldName that's the target of this mod.
- FieldRef _fieldRef;
-
- // 0 or index for $-positional in _fieldRef.
- size_t _posDollar;
-
- // Array of values to be set-union'ed onto target.
- mutablebson::Document _valDoc;
- mutablebson::Element _val;
-
- struct PreparedState;
- std::unique_ptr<PreparedState> _preparedState;
-
- const CollatorInterface* _collator = nullptr;
-};
-
-} // namespace mongo