Module Simula

Package simula.runtime

Class RTS_RTObject.ForList

java.lang.Object

simula.runtime.RTS_RTObject.ForList

All Implemented Interfaces:

Iterable<Boolean>

Enclosing class:

RTS_RTObject

public final class RTS_RTObject.ForList
extends Object
implements Iterable<Boolean>

The Implementation of the for-statement is a bit tricky. The basic idea is to create a ForList iterator that iterates over a set of ForElt iterators. The following subclasses of ForElt are defined:

• SingleElt<T> for basic types T control variable
• SingleTValElt for Text type control variable
• StepUntil for numeric types
• WhileElt<T> for basic types T control variable
• WhileTValElt representing For t:= <TextExpr> while <Cond> With text value assignment

Each of which has a boolean method 'hasNext' indicating whether this for-element is exhausted. All parameters to these classes are transferred 'by name'. This is done to ensure that all expressions are evaluated in the right order. The assignment to the 'control variable' is done within the various for-elements when the 'next' method is invoked.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) RTS_RTObject.ForListIterator	forListIterator	The ForList Iterator.

Constructor Summary

Constructors

Constructor	Description
ForList(RTS_RTObject.ForElt... forElt)	Create a ForList Iterator.

Method Summary

Modifier and Type	Method	Description
Iterator<Boolean>	iterator()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Details

forListIterator

RTS_RTObject.ForListIterator forListIterator

The ForList Iterator.

Constructor Details

ForList

public ForList(RTS_RTObject.ForElt... forElt)

Create a ForList Iterator.

Parameters:

forElt - an array of ForElt Iterators.

Method Details

iterator

public Iterator<Boolean> iterator()

Specified by:

iterator in interface Iterable<Boolean>