<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16414" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV>That's more a question for the PLT team, but I suggest you read section 4.5 of the PLT language manual. Among other things, structure inspectors make it possible to make structs opaque for some parts of a program and visible for other parts.</DIV> <DIV>Jos</DIV> <DIV> </DIV> <DIV>(((((lambda(x)((((((((x x)x)x)x)x)x)x)x))<BR>    (lambda(x)(lambda(y)(x(x y)))))<BR>   (lambda(x)(x)x))<BR>  (lambda()(printf "Greetings, Jos~n"))))</DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=gherson@snet.net href="mailto:gherson@snet.net">George Herson</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=jos.koot@telefonica.net href="mailto:jos.koot@telefonica.net">jos koot</A> ; <A title=plt-scheme@list.cs.brown.edu href="mailto:plt-scheme@list.cs.brown.edu">PLT-Scheme mailing list</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 14, 2007 2:58 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [plt-scheme] Re: newbie question: printing structs?</DIV> <DIV><BR></DIV>Good to know, Jos.<BR><BR>Why aren't structures made with this minimal inspector<BR>by default?  I had a pretty confusing time with this<BR>myself.  Fundamental to understanding anything with<BR>contents is seeing them.<BR><BR>Does creation of structures occur alot faster than<BR>creation of equivalent (small) hash tables?<BR><BR>thank you,<BR>george<BR><BR>--- jos koot <<A href="mailto:jos.koot@telefonica.net">jos.koot@telefonica.net</A>> wrote:<BR><BR>> You also will have to take care of the inspector,<BR>> i.e:<BR>> <BR>> (define-struct a (x y z))<BR>> (define sa (make-a 1 2 3))<BR>> sa ; --> #<struct:a><BR>> <BR>> (define inspector (make-inspector))<BR>> (define-struct b (x y z) inspector)<BR>> (define sb (make-b 1 2 3))<BR>> sb ; --> #(struct:b 1 2 3)<BR>> <BR>> Jos<BR>> <BR>> ----- Original Message ----- <BR>>   From: Andrew Reilly <BR>>   To: PLT-Scheme mailing list <BR>>   Sent: Tuesday, March 13, 2007 7:30 AM<BR>>   Subject: [plt-scheme] Re: newbie question:<BR>> printing structs?<BR>> <BR>> <BR>>   On Tue, Mar 13, 2007 at 04:53:11PM +1100, Andrew<BR>> Reilly wrote:<BR>>   > When debugging, how can I print the entire<BR>> contents of a struct?<BR>> <BR>>   Aah.  I think I've just got it:<BR>>   (print-struct #t) gates subsequent display of<BR>> struct contents, which is also<BR>>   gated by the #f argument to define-struct.  Neat.<BR>> <BR>>   Cheers,<BR>> <BR>>   -- <BR>>   Andrew<BR>>   _________________________________________________<BR>>     For list-related administrative tasks:<BR>>    <BR>> <A href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</A><BR>> > _________________________________________________<BR>>   For list-related administrative tasks:<BR>>  <BR>> <A href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</A><BR>> <BR><BR></BLOCKQUOTE></BODY></HTML>