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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala
/** The trait <code>Product</code> defines access functions for instances
* of products, in particular case classes.
*
* @author Burak Emir
* @version 1.0
*/
trait Product extends AnyRef {
/** for a product <code>A(x_1,...,x_k)</code>, returns <code>x_(n+1)</code>
* for <code>0 <= n < k</code>
*
* @param n the index of the element to return
* @throws IndexOutOfBoundsException
* @return The element <code>n</code> elements after the first element
*/
def productElement(n: Int): Any
/** return k for a product <code>A(x_1,...,x_k)</code>
*/
def productArity: Int
def productIterator: Iterator[Any] = new Iterator[Any] {
private var c: Int = 0
private val cmax = productArity
def hasNext = c < cmax
def next() = { val result = productElement(c); c += 1; result }
}
@deprecated("use productIterator instead")
def productElements: Iterator[Any] = productIterator
/**
* By default the empty string. Implementations may override this
* method in order to prepend a string prefix to the result of the
* toString methods.
*/
def productPrefix = ""
}
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