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(); <[email protected]>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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