Hi,
2016/7/30 Sat 5:38:42 UTC+9 Bram Moolenaar wrote:
> Patch 7.4.2120
> Problem: User defined functions can't be a closure.
> Solution: Add the "closure" argument. Allow using :unlet on a bound
> variable. (Yasuhiro Matsumoto, Ken Takata)
> Files: runtime/doc/eval.txt, src/testdir/test_lambda.vim, src/userfunc.c,
> src/eval.c src/proto/userfunc.pro
I had a report that this patch doesn't work as expected:
function! Foo()
let x = 0
function! Bar() closure
let x += 1
return x
endfunction
return function('Bar')
endfunction
let Count = Foo()
echo Count() " => 1
echo Count() " => 2
echo Count() " => 3
let Count2 = Foo()
echo Count() " => 1 (Should be 4)
The function Bar() should have been handled like a lambda function which means
reference counting is needed.
Using a dict function with closure works as expected:
function! Foo()
let x = 0
let d = {}
function! d.Bar() closure
let x += 1
return x
endfunction
return d.Bar
endfunction
(But this might be not so useful.)
I don't have a good idea to fix this problem. Current idea is:
* "function! Bar() closure" creates an unnamed function with the internal name
"<lambda>N", and
* The Funcref is assign to a local variable "Bar".
Not sure this goes well...
Regards,
Ken Takata
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