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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 
*
 
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* published by the Free Software Foundation.
  
Oracle designates this
 
* particular file as subject to the "Classpath" exception as provided
 
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*
 
* 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).
 
*
 
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*/
package java.util.function;

import java.util.Objects;

/**
 
* Represents a function that accepts two arguments and produces a result.
 
* This is the two-arity specialization of {@link Function}.
 
*
 
* <p>This is a<a href="package-summary.html">functional interface</a>
 
* whose functional method is {@link #apply(Object, Object)}.
 
*
 
* @param <T> the type of the first argument to the function
 
* @param <U> the type of the second argument to the function
 
* @param <R> the type of the result of the function
 
*
 
* @see Function
 
* @since 1.8
 
*/

@FunctionalInterface
public interface BiFunction<T, U, R> {

    
/**
     
* Applies this function to the given arguments.
     
*
     
* @param t the first function argument
     
* @param u the second function argument
     
* @return the function result
     
*/

    
R apply(T t, U u);

    
/**
     
* Returns a composed function that first applies this function to
     
* its input, and then applies the {@code after} function to the result.
     
* If evaluation of either function throws an exception, it is relayed to
     
* the caller of the composed function.
     
*
     
* @param <V> the type of output of the {@code after} function, and of the
     
*
           
composed function
     
* @param after the function to apply after this function is applied
     
* @return a composed function that first applies this function and then
     
* applies the {@code after} function
     
* @throws NullPointerException if after is null
     
*/

    
default <V> BiFunction<T, U, V> andThen(Function<? super R, ? extends V> after) {
        
Objects.requireNonNull(after);
        
return (T t, U u) -> after.apply(apply(t, u));
    
}
}