Tcl Source Code

The enclosed patch provides an implementation of TIP
#187, slightly modified. It creates a new command
[lambda], so that 
  % set p [lambda x {string length $x}]
  ::tcl::lambda::{x {string length $x}}
  % info proc tcl::lambda::*
  ::tcl::lambda::Create {::tcl::lambda::{x {string
length $x}}}
  % $p 1 2
  wrong # args: should be "::tcl::lambda::{x {string
length $x}} x"
  % $p bgiul
  5
  % append p " "
  ::tcl::lambda::{x {string length $x}}
  %  info proc tcl::lambda::*
  ::tcl::lambda::Create 
  % $p hvjh
  4
  %  info proc tcl::lambda::*
  ::tcl::lambda::Create {::tcl::lambda::{x {string
length $x}} } 
  % info body $p
  string length $x

Note that the lambda expressions auto cleanup on
shimmering (when " " was appended), but are otherwise
plain procs.

The enclosed patch creates the [lambda] as a builtin;
it is also possible to only patch tclObj.c and provide
the functionality as a C-extension; alternatively, one
could also patch only the .c files, and provide the
functionality via a pure tcl extension instead of
patching init.tcl

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This has been superseeded by Patch #940207 
https://sourceforge.net/tracker/index.php?func=detail&aid=940207&group_id=10894&atid=310894

File Deleted - 84592: 



File Added - 84595: lambda2.patch

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updated patch, some stuff goes under ::tcl::unsupported::

File Deleted - 84588: 



File Added - 84592: lambda2.patch

File Added - 84588: lambda2.patch

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new lambda2.patch: does not use ptr2 in the cmdNameType obj,
as some extensions use it for their own purposes. It is now
the Command struct itself that knows it should autocleanup,
no changes to any public structures.

File Deleted - 84496:

File Added - 84566: lambda.patch

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Can't do much about spaces in the name - except proposing
safety in eval'ing ...

Updated patch,  follows the TIP more closely. Now we have
  % set p [lambda x {string length $x}]
   ::tcl::lambda x {string length $x}
ie, $p's string rep is [list ::tcl::lambda $argList $body]

::tcl::lambda::Create and the modifs to ::unknown are meant
to recreate a lambda expression from its string
representation, to recover from a possible shimmering; they
may not be robust enough for other uses.

This is a non-standard hacky way to satisfy the "every value
is a string" requisite; not sure how much I like it.

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Boo ... bad proc names, review needed!
 % $p hgg
 3
 % eval $p jhg
 extra characters after close-brace

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File Added - 84496: lambda.patch

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Patch updated, with slightly clearer code.

File Added - 84494: lambda.patch