<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Are you saying that you don’t like importing M3CG as well as M3CG_Ops?<br><br>
<br><div><div>On Sep 26, 2012, at 3:30 PM, Jay <<a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div bgcolor="#FFFFFF"><div>Ok but this seems not great..<br><br> - Jay (briefly/pocket-sized-computer-aka-phone)</div><div><br>On Sep 26, 2012, at 8:58 AM, Antony Hosking <<a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a>> wrote:<br><br></div><div></div><blockquote type="cite">Yes, M3CG.T is the most abstract type.<div>Please don’t make this change.<br>
<br><div><div>On Sep 26, 2012, at 11:36 AM, Jay K <<a href="mailto:jay.krell@cornell.edu"></a><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div class="hmmessage" style="font-size: 12pt; font-family: Calibri; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div dir="ltr"><font face="Calibri, sans-serif" size="3">It is not pervasive.</font><div style="font-family: Calibri, sans-serif; font-size: 12pt; ">It is like one line in about six files. M3CG.T => M3CG_Ops.Publics.</div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; ">I guess you are saying that M3CG.T is merely the extremely abstract ROOT, where M3CG_Ops.Public has a bunch of methods? Then I might argue that M3CG.T is overly abstract -- it is like void* instead of pointer just with a bunch of methods.</div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; ">This isn't quite right, doesn't compilte, but rougly:</div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div><div><font face="Calibri, sans-serif">Index: M3CG_BinRd.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_BinRd.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.2</font></div><div><font face="Calibri, sans-serif">diff -u -r1.2 M3CG_BinRd.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_BinRd.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>12 Feb 2001 15:25:47 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.2</font></div><div><font face="Calibri, sans-serif">+++ M3CG_BinRd.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:32 -0000</font></div><div><font face="Calibri, sans-serif">@@ -3,9 +3,9 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> INTERFACE M3CG_BinRd;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-IMPORT M3CG, Rd;</font></div><div><font face="Calibri, sans-serif">+IMPORT M3CG_Ops, Rd;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE Inhale (rd: Rd.T; cg: M3CG.T);</font></div><div><font face="Calibri, sans-serif">+PROCEDURE Inhale (rd: Rd.T; cg: M3CG_Ops.Public);</font></div><div><font face="Calibri, sans-serif"> (* Parse the binary intermediate code M3CG calls from 'rd'</font></div><div><font face="Calibri, sans-serif"> and call 'cg' to implement them. *)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">Index: M3CG_BinRd.m3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_BinRd.m3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.19</font></div><div><font face="Calibri, sans-serif">diff -u -r1.19 M3CG_BinRd.m3</font></div><div><font face="Calibri, sans-serif">--- M3CG_BinRd.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>4 Sep 2012 14:29:54 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.19</font></div><div><font face="Calibri, sans-serif">+++ M3CG_BinRd.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:32 -0000</font></div><div><font face="Calibri, sans-serif">@@ -20,7 +20,7 @@</font></div><div><font face="Calibri, sans-serif"> TYPE</font></div><div><font face="Calibri, sans-serif"> State = RECORD</font></div><div><font face="Calibri, sans-serif"> rd : Rd.T;</font></div><div><font face="Calibri, sans-serif">- cg : M3CG.T;</font></div><div><font face="Calibri, sans-serif">+ cg : M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> buf : InputBuffer;</font></div><div><font face="Calibri, sans-serif"> buf_len: CARDINAL;</font></div><div><font face="Calibri, sans-serif"> buf_ptr: CARDINAL;</font></div><div><font face="Calibri, sans-serif">@@ -200,7 +200,7 @@</font></div><div><font face="Calibri, sans-serif"> Cmd {Bop.fetch_and_xor, fetch_and_xor}</font></div><div><font face="Calibri, sans-serif"> };</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE Inhale (rd: Rd.T; cg: M3CG.T) =</font></div><div><font face="Calibri, sans-serif">+PROCEDURE Inhale (rd: Rd.T; cg: M3CG_Ops.Public) =</font></div><div><font face="Calibri, sans-serif"> VAR s: State; op: M3CG.Name; cmd: INTEGER;</font></div><div><font face="Calibri, sans-serif"> BEGIN</font></div><div><font face="Calibri, sans-serif"> s.rd := rd;</font></div><div><font face="Calibri, sans-serif">Index: M3CG_BinWr.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_BinWr.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.2</font></div><div><font face="Calibri, sans-serif">diff -u -r1.2 M3CG_BinWr.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_BinWr.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>12 Feb 2001 15:25:47 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.2</font></div><div><font face="Calibri, sans-serif">+++ M3CG_BinWr.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:32 -0000</font></div><div><font face="Calibri, sans-serif">@@ -3,9 +3,9 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> INTERFACE M3CG_BinWr;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-IMPORT M3CG, Wr;</font></div><div><font face="Calibri, sans-serif">+IMPORT M3CG_Ops, Wr;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE New (wr: Wr.T): M3CG.T;</font></div><div><font face="Calibri, sans-serif">+PROCEDURE New (wr: Wr.T): M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> (* returns a fresh, initialized code generator that writes its</font></div><div><font face="Calibri, sans-serif"> calls as binary intermediate code on 'wr'. See M3CG_Binary</font></div><div><font face="Calibri, sans-serif"> for the binary format. *)</font></div><div><font face="Calibri, sans-serif">Index: M3CG_BinWr.m3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_BinWr.m3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.23</font></div><div><font face="Calibri, sans-serif">diff -u -r1.23 M3CG_BinWr.m3</font></div><div><font face="Calibri, sans-serif">--- M3CG_BinWr.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>4 Sep 2012 15:20:09 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.23</font></div><div><font face="Calibri, sans-serif">+++ M3CG_BinWr.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:32 -0000</font></div><div><font face="Calibri, sans-serif">@@ -27,7 +27,7 @@</font></div><div><font face="Calibri, sans-serif"> END;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> TYPE</font></div><div><font face="Calibri, sans-serif">- U = M3CG.T OBJECT</font></div><div><font face="Calibri, sans-serif">+ U = M3CG_Ops.Public OBJECT</font></div><div><font face="Calibri, sans-serif"> wr : Wr.T := NIL;</font></div><div><font face="Calibri, sans-serif"> buf : M3Buf.T := NIL;</font></div><div><font face="Calibri, sans-serif"> buf_len : INTEGER := 0;</font></div><div><font face="Calibri, sans-serif">@@ -375,7 +375,7 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> (*---------------------------------------------------------------------------*)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE New (output: Wr.T): M3CG.T =</font></div><div><font face="Calibri, sans-serif">+PROCEDURE New (output: Wr.T): M3CG_Ops.Public =</font></div><div><font face="Calibri, sans-serif"> VAR mbuf := M3Buf.New ();</font></div><div><font face="Calibri, sans-serif"> BEGIN</font></div><div><font face="Calibri, sans-serif"> M3Buf.AttachDrain (mbuf, output);</font></div><div><font face="Calibri, sans-serif">Index: M3CG_Check.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Check.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.1.1.1</font></div><div><font face="Calibri, sans-serif">diff -u -r1.1.1.1 M3CG_Check.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Check.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>14 Jan 2001 13:40:37 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.1.1.1</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Check.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:32 -0000</font></div><div><font face="Calibri, sans-serif">@@ -7,11 +7,11 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> INTERFACE M3CG_Check;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-IMPORT M3CG;</font></div><div><font face="Calibri, sans-serif">+IMPORT M3CG_Ops;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE New (child: M3CG.T;</font></div><div><font face="Calibri, sans-serif">+PROCEDURE New (child: M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> clean_jumps, clean_stores: BOOLEAN;</font></div><div><font face="Calibri, sans-serif">- nested_calls, nested_procs: BOOLEAN): M3CG.T;</font></div><div><font face="Calibri, sans-serif">+ nested_calls, nested_procs: BOOLEAN): M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> (* returns a fresh, initialized code generator that passes its calls</font></div><div><font face="Calibri, sans-serif"> to 'child' and checks that the stream obeys the M3CG restrictions.</font></div><div><font face="Calibri, sans-serif"> If 'clean_jumps', it also checks that the stack is empty at every</font></div><div><font face="Calibri, sans-serif">Index: M3CG_Check.m3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Check.m3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.17</font></div><div><font face="Calibri, sans-serif">diff -u -r1.17 M3CG_Check.m3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Check.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>4 Sep 2012 14:47:43 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.17</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Check.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -32,7 +32,7 @@</font></div><div><font face="Calibri, sans-serif"> };</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> TYPE</font></div><div><font face="Calibri, sans-serif">- U = M3CG.T OBJECT</font></div><div><font face="Calibri, sans-serif">+ U = M3CG_Ops.Public OBJECT</font></div><div><font face="Calibri, sans-serif"> clean_stores := FALSE;</font></div><div><font face="Calibri, sans-serif"> clean_jumps := FALSE;</font></div><div><font face="Calibri, sans-serif"> nested_calls := TRUE;</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Ops.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.12</font></div><div><font face="Calibri, sans-serif">diff -u -r1.12 M3CG_Ops.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Ops.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>16 Aug 2012 13:12:35 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.12</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Ops.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -30,7 +30,7 @@</font></div><div><font face="Calibri, sans-serif"> Public = OBJECT</font></div><div><font face="Calibri, sans-serif"> (*------------------------------------------------ READONLY configuration ---*)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-child: M3CG.T := NIL;</font></div><div><font face="Calibri, sans-serif">+child: Public := NIL;</font></div><div><font face="Calibri, sans-serif"> (* The default methods simply call the corresponding method in 'child',</font></div><div><font face="Calibri, sans-serif"> hence a vanilla 'M3CG.T' can be used as a filter where you override</font></div><div><font face="Calibri, sans-serif"> only the methods of interest. *)</font></div><div><font face="Calibri, sans-serif">Index: M3CG_Rd.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Rd.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.1.1.1</font></div><div><font face="Calibri, sans-serif">diff -u -r1.1.1.1 M3CG_Rd.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Rd.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>14 Jan 2001 13:40:37 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.1.1.1</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Rd.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -7,9 +7,9 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> INTERFACE M3CG_Rd;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-IMPORT M3CG, Rd;</font></div><div><font face="Calibri, sans-serif">+IMPORT M3CG_Ops, Rd;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE Inhale (rd: Rd.T; cg: M3CG.T);</font></div><div><font face="Calibri, sans-serif">+PROCEDURE Inhale (rd: Rd.T; cg: M3CG_Ops.Public);</font></div><div><font face="Calibri, sans-serif"> (* Parse the M3CG calls from 'rd' and call 'cg' to implement them. *)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> END M3CG_Rd.</font></div><div><font face="Calibri, sans-serif">Index: M3CG_Rd.m3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Rd.m3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.15</font></div><div><font face="Calibri, sans-serif">diff -u -r1.15 M3CG_Rd.m3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Rd.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>4 Sep 2012 14:52:46 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.15</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Rd.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -22,7 +22,7 @@</font></div><div><font face="Calibri, sans-serif"> TYPE</font></div><div><font face="Calibri, sans-serif"> State = RECORD</font></div><div><font face="Calibri, sans-serif"> rd : Rd.T;</font></div><div><font face="Calibri, sans-serif">- cg : M3CG.T;</font></div><div><font face="Calibri, sans-serif">+ cg : M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> ch : CHAR; (* current scan character *)</font></div><div><font face="Calibri, sans-serif"> buf : InputBuffer;</font></div><div><font face="Calibri, sans-serif"> buf_len: CARDINAL;</font></div><div><font face="Calibri, sans-serif">@@ -206,7 +206,7 @@</font></div><div><font face="Calibri, sans-serif"> cmds: IntIntTbl.T := NIL;</font></div><div><font face="Calibri, sans-serif"> types: IntIntTbl.T := NIL;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE Inhale (rd: Rd.T; cg: M3CG.T) =</font></div><div><font face="Calibri, sans-serif">+PROCEDURE Inhale (rd: Rd.T; cg: M3CG_Ops.Public) =</font></div><div><font face="Calibri, sans-serif"> VAR s: State; op: M3CG.Name; cmd: INTEGER;</font></div><div><font face="Calibri, sans-serif"> BEGIN</font></div><div><font face="Calibri, sans-serif"> s.rd := rd;</font></div><div><font face="Calibri, sans-serif">Index: M3CG_Wr.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Wr.i3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.1.1.1</font></div><div><font face="Calibri, sans-serif">diff -u -r1.1.1.1 M3CG_Wr.i3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Wr.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>14 Jan 2001 13:40:37 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.1.1.1</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Wr.i3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -7,9 +7,9 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> INTERFACE M3CG_Wr;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-IMPORT M3CG, Wr;</font></div><div><font face="Calibri, sans-serif">+IMPORT M3CG_Ops, Wr;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE New (wr: Wr.T): M3CG.T;</font></div><div><font face="Calibri, sans-serif">+PROCEDURE New (wr: Wr.T): M3CG_Ops.Public;</font></div><div><font face="Calibri, sans-serif"> (* returns a fresh, initialized code generator that writes its</font></div><div><font face="Calibri, sans-serif"> calls as readable ASCII on 'wr'. *)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">Index: M3CG_Wr.m3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div><div><font face="Calibri, sans-serif">RCS file: /usr/cvs/cm3/m3-sys/m3middle/src/M3CG_Wr.m3,v</font></div><div><font face="Calibri, sans-serif">retrieving revision 1.18</font></div><div><font face="Calibri, sans-serif">diff -u -r1.18 M3CG_Wr.m3</font></div><div><font face="Calibri, sans-serif">--- M3CG_Wr.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>22 Aug 2012 14:15:40 -0000<span class="Apple-tab-span" style="white-space: pre; "> </span>1.18</font></div><div><font face="Calibri, sans-serif">+++ M3CG_Wr.m3<span class="Apple-tab-span" style="white-space: pre; "> </span>26 Sep 2012 15:34:33 -0000</font></div><div><font face="Calibri, sans-serif">@@ -27,7 +27,7 @@</font></div><div><font face="Calibri, sans-serif"> END;</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> TYPE</font></div><div><font face="Calibri, sans-serif">- U = M3CG.T OBJECT</font></div><div><font face="Calibri, sans-serif">+ U = M3CG_Ops.Public OBJECT</font></div><div><font face="Calibri, sans-serif"> wr : Wr.T := NIL;</font></div><div><font face="Calibri, sans-serif"> buf : M3Buf.T := NIL;</font></div><div><font face="Calibri, sans-serif"> buf_len : INTEGER := 0;</font></div><div><font face="Calibri, sans-serif">@@ -375,7 +375,7 @@</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif"> (*---------------------------------------------------------------------------*)</font></div><div><font face="Calibri, sans-serif"> </font></div><div><font face="Calibri, sans-serif">-PROCEDURE New (output: Wr.T): M3CG.T =</font></div><div><font face="Calibri, sans-serif">+PROCEDURE New (output: Wr.T): M3CG_Ops.Public =</font></div><div><font face="Calibri, sans-serif"> VAR mbuf := M3Buf.New ();</font></div><div><font face="Calibri, sans-serif"> BEGIN</font></div><div><font face="Calibri, sans-serif"> M3Buf.AttachDrain (mbuf, output);</font></div><div><font face="Calibri, sans-serif">Index: Target.i3</font></div><div><font face="Calibri, sans-serif">===================================================================</font></div></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "><br></div><div style="font-family: Calibri, sans-serif; font-size: 12pt; "> - Jay<br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">From: <a href="mailto:hosking@cs.purdue.edu"></a><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>Date: Wed, 26 Sep 2012 10:42:26 -0400<br>To: <a href="mailto:jay.krell@cornell.edu"></a><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a><br>CC: <a href="mailto:m3devel@elegosoft.com"></a><a href="mailto:m3devel@elegosoft.com">m3devel@elegosoft.com</a><br>Subject: Re: [M3devel] M3CG_Ops.Public vs. M3CG.T<br><br>I disagree. M3CG.T is more abstract than M3CG_Ops. The revelation of M3CG.T <: M3CG_Ops.Public is in M3CG_Ops. If you want the ops you simply import that interface to get the revelation. Please don’t make pervasive changes in interfaces that some of us are developing against.<br><br><div><div>On Sep 26, 2012, at 4:11 AM, Jay K <<a href="mailto:jay.krell@cornell.edu"></a><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a>> wrote:</div><br class="ecxApple-interchange-newline"><blockquote><div class="ecxhmmessage" style="font-size: 12pt; font-family: Calibri; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; "><div dir="ltr"><div><font face="Calibri, sans-serif">M3CG_Ops.i3:</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif">child: M3CG.T := NIL;</font></div><div><font face="Calibri, sans-serif">(* The default methods simply call the corresponding method in 'child',</font></div><div><font face="Calibri, sans-serif"> hence a vanilla 'M3CG.T' can be used as a filter where you override</font></div><div><font face="Calibri, sans-serif"> only the methods of interest. *)</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif">1)</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif">I am not keen on fixing this, but I feel this was clearly a mistake.</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif">M3CG_Ops.Public should have been "purely abstract" with no default</font></div><div><font face="Calibri, sans-serif">implementation.</font></div><div><font face="Calibri, sans-serif">M3CG_Filter.T or somesuch could have been as described.</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif">2) I am fixing:</font></div><div><font face="Calibri, sans-serif">M3CG.T is overused.</font></div><div><font face="Calibri, sans-serif">Most uses should be M3CG_Ops.Public.</font></div><div><font face="Calibri, sans-serif">It is ok to derive from -- though that was a mistake.</font></div><div><font face="Calibri, sans-serif">But functions that take or return M3CG.T should really be</font></div><div><font face="Calibri, sans-serif">taking and returning M3CG_Ops.Public.</font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif"><br></font></div><div><font face="Calibri, sans-serif"> - Jay</font></div></div></div></blockquote></div></div></div></div></div></blockquote></div><br></div></blockquote></div></blockquote></div><br></body></html>