How to print structures in PLT Scheme so as to display their fields?

Posted by tkf on Stack Overflow See other posts from Stack Overflow or by tkf
Published on 2010-02-02T05:24:48Z Indexed on 2010/05/18 15:50 UTC
Read the original article Hit count: 192

Filed under:

plt-scheme

|

data-structures

|

Scheme

I would like code like this:

(define-struct thing (a b c))
(define th (make-thing 1 2 3))

to print something like this:

(make-thing 1 2 3)

when I type "th" into either the DrScheme or MzScheme repl. I am using the language "pretty big" in DrScheme with output style set to "constructor". This is what I get in DrScheme:

(make-thing ...)

(i literally get the three dots)

In MzScheme:

#<thing>

© Stack Overflow or respective owner

Related posts about plt-scheme

PLT Scheme Extracting field ids from structures

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to see if I can map PLT Scheme structure fields to columns in a DB. I've figured out how to extract accessor functions from structures in PLT scheme using the fourth return value of: (struct-type-info) However the returned procedure indexes into the struct using an integer. Is there… >>> More
PLT Scheme Memory

as seen on Stack Overflow - Search for 'Stack Overflow'
So I need some help with implementing a Make-memory program using Scheme. I need two messages 'write and 'read. So it would be like (mymem 'write 34 -116) and (mymem 'read 99) right? and (define mymem (make-memory 100)).....How would I implement this in scheme? using an Alist???I need some help coding… >>> More
PLT Scheme URL dispatch

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to hook up URL dispatch with PLT Scheme. I've taken a look at the tutorial and the server documentation. I can figure out how to route requests to the same servlets. Specific example: (define (start request) (blog-dispatch request)) (define-values (blog-dispatch blog-url) (dispatch-rules … >>> More
PLT Scheme sort function

as seen on Stack Overflow - Search for 'Stack Overflow'
PLT Scheme guide says that it's implemented sort function is able to sort a list according to an extarcted value using a lambda function. link text The guide provides an unworking code example of this- (sort '(("aardvark") ("dingo") ("cow") ("bear")) #:key car string<?) Which returns… >>> More
plt-scheme : catching mouse click event on canvas

as seen on Stack Overflow - Search for 'Stack Overflow'
I am writing a tic-tac-toe game in plt-scheme as my AI course project. The idea for gui is a grid with 9 boxes, each with a canvas, using panes ... When the user click on a canvas, 'X' or 'O' will be drawn accordingly ... The question is how can I catch mouse click event on canvas? I found out I… >>> More

Related posts about data-structures

Clever ways of implementing different data structures in C & data structures that should be used mor

as seen on Stack Overflow - Search for 'Stack Overflow'
What are some clever (not ordinary) ways of implementing data structures in C, and what are some data structures that should be used more often? For example, what is the most effective way (generating minimal overhead) to implement a directed and cyclic graph with weighted edges in C? I know that… >>> More
Is there a way to track data structure dependencies from the database, through the tiers, all the way out to a web page?

as seen on Programmers - Search for 'Programmers'
When we design applications, we generally end up with the same tiered sets of data structures: A persistent data structure that is described using DDL and implemented as RDBMS tables and columns. A set of domain objects that consist primarily of data structures, usually combined with business-rule… >>> More
Why are data structures so important in interviews?

as seen on Programmers - Search for 'Programmers'
I am a newbie into the corporate world recently graduated in computers. I am a java/groovy developer. I am a quick learner and I can learn new frameworks, APIs or even programming languages within considerably short amount of time. Albeit that, I must confess that I was not so strong in data structures… >>> More
Thread-safe data structures

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I have to design a data structure that is to be used in a multi-threaded environment. The basic API is simple: insert element, remove element, retrieve element, check that element exists. The structure's implementation uses implicit locking to guarantee the atomicity of a single API call.… >>> More
Data Structures

as seen on Stack Overflow - Search for 'Stack Overflow'
There is a large stream of numbers coming in such as 5 6 7 2 3 1 2 3 .. What kind of data structure is suitable for this problem given the constraints that elements must be inserted in descending order and duplicates should be eliminated. I am not looking for any code just ideas? I was thinking… >>> More