/*
 
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 
*
 
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* under the terms of the GNU General Public License version 2 only, as
 
* published by the Free Software Foundation.
  
Oracle designates this
 
* particular file as subject to the "Classpath" exception as provided
 
* by Oracle in the LICENSE file that accompanied this code.
 
*
 
* This code 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 General Public License
 
* version 2 for more details (a copy is included in the LICENSE file that
 
* accompanied this code).
 
*
 
* You should have received a copy of the GNU General Public License version
 
* 2 along with this work; if not, write to the Free Software Foundation,
 
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 
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*/
package java.util.function;

/**
 
* Represents an operation on a single operand that produces a result of the
 
* same type as its operand.
  
This is a specialization of {@code Function} for
 
* the case where the operand and result are of the same type.
 
*
 
* <p>This is a<a href="package-summary.html">functional interface</a>
 
* whose functional method is {@link #apply(Object)}.
 
*
 
* @param <T> the type of the operand and result of the operator
 
*
 
* @see Function
 
* @since 1.8
 
*/

@FunctionalInterface
public interface UnaryOperator<T> extends Function<T, T> {

    
/**
     
* Returns a unary operator that always returns its input argument.
     
*
     
* @param <T> the type of the input and output of the operator
     
* @return a unary operator that always returns its input argument
     
*/

    
static <T> UnaryOperator<T> identity() {
        
return t -> t;
    
}
}