[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

some code

From: Catonano
Subject: some code
Date: Mon, 6 Jun 2016 17:05:06 +0200

There's a piece of code (in the Emacs build system) I don't understand

In "guix/build-system/emacs.scm" on line 97 there's a call to a function called "emacs-build"

Such call is inside the body of "emacs-build" itself. As it is common in scheme, a function is calling itself (recursively)

Now, I read the SICP and the discussion about functions implementing processes that can be iterative or recursive (in both cases the function calls itself)

But I don't understand what is going on here

Why is "emacs-build" calling itself ? Is this an iterative or recursive process ?

And what value is this calculating ?

I see that the result of this calculation ("  (define builder..."  ) is passed as an argument to "build-_expression_->derivation" a few lines below

But I don't get what build-_expression_->derivation is receiving really.

Also what's with that "define*" ? Is there a manual page describing it ? I couldn't find it

reply via email to

[Prev in Thread] Current Thread [Next in Thread]