Module Simula

Package simula.runtime

Class RTS_Linkage

java.lang.Object

simula.runtime.RTS_RTObject

simula.runtime.RTS_ENVIRONMENT

simula.runtime.RTS_BASICIO

simula.runtime.RTS_CLASS

simula.runtime.RTS_Linkage

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

RTS_Head, RTS_Link

public class RTS_Linkage
extends RTS_CLASS

System class Linkage.

          class linkage;
          begin ref (linkage) SUC, PRED;
             ref (link) procedure suc;
                        suc:- if SUC in link then SUC else none;
             ref (link) procedure pred;
                       pred:- if PRED in link then PRED else none;
             ref (linkage) procedure prev;   prev:- PRED;
 
          end linkage;
 

The class "linkage" is the common denominator for set heads and set members.

SUC is a reference to the successor of this linkage object in the set, PRED is a reference to the predecessor.

The value of SUC and PRED may be obtained through the procedures "suc" and "pred". These procedures give the value none if the designated object is not a set member, i.e. of class "link" or a subclass of "link".

The attributes SUC and PRED may only be modified through the use of procedures defined within "link" and "head". This protects the user against certain kinds of programming errors.

The procedure "prev" enables a user to access a set head from its first member.

Link to GitHub: Source File.

Author:

SIMULA Standards Group, Øystein Myhre Andersen

Nested Class Summary

Nested classes/interfaces inherited from class simula.runtime.RTS_RTObject

RTS_RTObject.ForElt, RTS_RTObject.ForList, RTS_RTObject.ForListIterator, RTS_RTObject.OperationalState, RTS_RTObject.RTS_BOOLEAN_ARRAY, RTS_RTObject.RTS_BOUNDS, RTS_RTObject.RTS_CHARACTER_ARRAY, RTS_RTObject.RTS_INTEGER_ARRAY, RTS_RTObject.RTS_LABEL, RTS_RTObject.RTS_LONG_REAL_ARRAY, RTS_RTObject.RTS_NAME<T>, RTS_RTObject.RTS_REAL_ARRAY, RTS_RTObject.RTS_REALTYPE_ARRAY, RTS_RTObject.RTS_REF_ARRAY<T>, RTS_RTObject.RTS_TEXT_ARRAY, RTS_RTObject.SingleElt<T>, RTS_RTObject.SingleTValElt, RTS_RTObject.StepUntil, RTS_RTObject.UncaughtExceptionHandler, RTS_RTObject.WhileElt<T>, RTS_RTObject.WhileTValElt

Field Summary

Fields

Modifier and Type	Field	Description
protected RTS_Linkage	PRED	The variable PRED.
protected RTS_Linkage	SUC	The variable SUC.

Fields inherited from class simula.runtime.RTS_ENVIRONMENT

_STARTTIME, CURRENTDECIMALMARK, CURRENTLOWTEN, EXCEPTION_HANDLER, maxint, maxlongreal, maxreal, minint, minlongreal, minreal, simulaReleaseID

Fields inherited from class simula.runtime.RTS_RTObject

_CORUT, _CTX, _CUR, _DL, _INPUT_LINELENGTH, _JTX, _OUTPUT_LINELENGTH, _SL, _STATE, _SYSIN, _SYSOUT, NOTEXT

Constructor Summary

Constructors

Constructor	Description
RTS_Linkage(RTS_RTObject SL)	Create a new _Linkage.

Method Summary

Modifier and Type	Method	Description
RTS_Linkage	_STM()	Method representing the Statements in this Block This method is virtual and must be redefined in blocks.
RTS_Link	pred()	Returns the predecessor link.
RTS_Linkage	prev()	Return the previous linkage.
RTS_Link	suc()	Returns the successor link.

Methods inherited from class simula.runtime.RTS_CLASS

_START, run

Methods inherited from class simula.runtime.RTS_BASICIO

toString

Methods inherited from class simula.runtime.RTS_ENVIRONMENT

_char, _IPOW, _IS, abs, abs, abs, addepsilon, addepsilon, arccos, arcsin, arctan, arctan2, Char, clocktime, cos, cosh, cotan, cputime, datetime, decimalmark, DEFEXCEPTION, digit, discrete, draw, edfix, edit, edit, edit, edit, edit, edtime, entier, Erlang, error, exp, getIntInfo, getTextInfo, giveIntInfo, giveTextInfo, hash, histd, histo, isochar, isorank, letter, linear, ln, loadChar, log10, lowcase, lowerbound, lowten, max, max, max, max, max, min, min, min, min, min, mod, negexp, normal, Poisson, printStaticChain, printThreadList, randint, rank, rem, rts_utility, sign, simulaid, sin, sinh, sqrt, storeChar, subepsilon, subepsilon, tan, tanh, uniform, upcase, upperbound, waitSomeTime

Methods inherited from class simula.runtime.RTS_RTObject

_ASGSTR, _ASGTXT, _GOTO, _JUMPTABLE, _JUMPTABLE, _LABEL, _PRE_LABEL, _PRE_TABLE, _SIM_LABEL, _TXTREL_EQ, _TXTREL_GE, _TXTREL_GT, _TXTREL_LE, _TXTREL_LT, _TXTREL_NE, _VALUE, arrayValue, BBLK, blanks, BPRG, call, call, CONC, copy, detach, detach, detach, doubleValue, EBLK, edObjectAttributes, edObjectIdent, floatValue, getErrorMessage, intValue, isDetachUsed, isQPSystemBlock, objectTraceIdentifier, objectTraceIdentifier, objectValue, procValue, resume, resume, resume, swapCoroutines, sysin, sysout, terminate_program, TRACE_GOTO, TRF_EQ, TRF_NE

Methods inherited from class java.lang.Object

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

Field Details

SUC

protected RTS_Linkage SUC

The variable SUC.

PRED

protected RTS_Linkage PRED

The variable PRED.

Constructor Details

RTS_Linkage

public RTS_Linkage(RTS_RTObject SL)

Create a new _Linkage.

Parameters:

SL - staticLink

Method Details

_STM

public RTS_Linkage _STM()

Description copied from class: RTS_RTObject

Method representing the Statements in this Block
This method is virtual and must be redefined in blocks.

Overrides:

_STM in class RTS_RTObject

Returns:

a pointer to this _RTObject

suc

public RTS_Link suc()

Returns the successor link.

Returns:

the successor link

pred

public RTS_Link pred()

Returns the predecessor link.

Returns:

the predecessor link

prev

public RTS_Linkage prev()

Return the previous linkage.

Returns:

the previous linkage