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/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
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package org.luaj.vm2.lib;

import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Varargs;

/** Abstract base class for Java function implementations that take two arguments and 
 * return one value. 
 * 

* Subclasses need only implement {@link LuaValue#call(LuaValue,LuaValue)} to complete this class, * simplifying development. * All other uses of {@link #call()}, {@link #invoke(Varargs)},etc, * are routed through this method by this class, * dropping or extending arguments with {@code nil} values as required. *

* If more or less than two arguments are required, * or variable argument or variable return values, * then use one of the related function * {@link ZeroArgFunction}, {@link OneArgFunction}, {@link ThreeArgFunction}, or {@link VarArgFunction}. *

* See {@link LibFunction} for more information on implementation libraries and library functions. * @see #call(LuaValue,LuaValue) * @see LibFunction * @see ZeroArgFunction * @see OneArgFunction * @see ThreeArgFunction * @see VarArgFunction */ abstract public class TwoArgFunction extends LibFunction { abstract public LuaValue call(LuaValue arg1, LuaValue arg2); /** Default constructor */ public TwoArgFunction() { } public final LuaValue call() { return call(NIL, NIL); } public final LuaValue call(LuaValue arg) { return call(arg, NIL); } public LuaValue call(LuaValue arg1, LuaValue arg2, LuaValue arg3) { return call(arg1, arg2); } public Varargs invoke(Varargs varargs) { return call(varargs.arg1(),varargs.arg(2)); } }





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