How to type hint a float array?

Question

This code

(GL33/glUniform2fv ^int (location shader "offsets") ^float [] offsets)

produces this error:

No matching method glUniform2fv found taking 3 args for class org.lwjgl.opengl.GL33

I've tried removing the space:

(GL33/glUniform2fv ^int (location shader "offsets") ^float[] offsets)

to no avail.

Clojure seems to be mistaking the ^float [] type hint for a parameter - but not the ^int type hint.

What can I do about that?

Not quite enough context here to know for sure, but maybe ^floats offsets? There is some documentation here: clojure.org/reference/java_interop#typehints — Harold
– Harold, Commented Oct 22 at 15:22
Yes, specifically clojure.org/reference/java_interop#TypeAliases says that ^floats is a convenient alias for the awkward underlying JVM name - which you can use instead, if you like: ^"[F" — amalloy
– amalloy, Commented Oct 22 at 16:29

Noah Bogart · Accepted Answer · 2025-11-04 17:00:20Z

1

Pre Clojure 1.12

As noted in the comments, floats is the way to type hint that symbol.

ref: Type Aliases

Post Clojure 1.12

If using Clojure 1.12 or later, you can specify an array class of N dimensions by using Classname/N. For your purposes here, you can write float/1.

ref: Java interop: Class access, Clojure 1.12 release notes

answered Nov 4 at 17:00

Noah Bogart

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