so how about this then?
nREPL server started on port 43830
REPL-y 0.2.0
Clojure 1.5.1
Docs: (doc function-name-here)
(find-doc "part-of-name-here")
Source: (source function-name-here)
Javadoc: (javadoc java-object-or-class-here)
Exit: Control+D or (exit) or (quit)
user=> (set! *warn-on-reflection* true)
true
user=> (defn foo [^String s] (.substring s 0 (.length s)))
#'user/foo
user=> (foo "jim")
"jim"
user=> (.length (foo "jim"))
*Reflection warning, NO_SOURCE_PATH:1:1 - reference to field length
can't be resolved.*
3
user=> (defn foo ^String [^String s] (.substring s 0 (.length s)))
#'user/foo
user=> (.length (foo "jim"))
3
user=> (defn ^String foo [^String s] (.substring s 0 (.length s)))
#'user/foo
user=> (.length (foo "jim"))
3
it worked both times didn't it?
Jim
On 17/06/13 17:59, Ambrose Bonnaire-Sergeant wrote:
After some investigation, the before-the-arglist syntax only seems
useful for defining fn's that return primitive types.
They don't seem to help resolve reflection calls.
(require '[clojure.tools.analyzer :refer [ast]])
; this creates a double-emitting fn
(ast (fn (^double [^double a] a)))
; =>
;{:op :fn-expr,
; ...
; :methods
; ({:op :fn-method,
; ...
; :arg-types (#<Type Ljava/lang/Object;>),
; :return-type #<Type D>}), ;double return type here
; ...
; :tag nil} ; no tag
; this creates a regular old fn
(ast (fn (^String [a] 1)))
; =>
;{:op :fn-expr,
; ...
; ({:op :fn-method,
; ...
; :arg-types (#<Type Ljava/lang/Object;>),
; :return-type #<Type Ljava/lang/Object;>}), ;object return type
; ...
; :tag nil} ; no tag
; this creates a String-hinted fn
(ast ^String (fn a [a] 1))
;{:op :meta,
; ...
; :expr
; {:op :fn-expr,
; ...
; :methods
; ({:op :fn-method,
; :arg-types (#<Type Ljava/lang/Object;>),
; :return-type #<Type Ljava/lang/Object;>}),
; ...
; :tag String}}
I don't see where before-the-arglist is useful outside of primitive fns.
Thanks,
Ambrose
On Mon, Jun 17, 2013 at 7:59 PM, Jim - FooBar(); <jimpil1...@gmail.com
<mailto:jimpil1...@gmail.com>> wrote:
Hi all,
It seems to me that return type-hints can go either right after
"defn", or after the doc-string. I generally, put the return
type-hints right before the argument vector and it seems to get
rid of reflection. However, I just had a look at
core.contrib.strutils2 and the author(s) put the type hint right
after 'defn' (before the var about to be defined) and again it
gets rid of reflection! Which one is it? both are acceptable?
thanks in advance,
Jim
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