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Bug 21790 – Finding template UDAs is not possible

Status: NEW
Severity: normal
Priority: P3
Component: phobos
Product: D
Version: D2
Platform: x86_64
OS: Linux
Creation time: 2021-04-02T14:08:00Z
Last change time: 2024-12-01T16:38:39Z
Assigned to: No Owner
Creator: Eyal

Comments

Comment #0 by eyal — 2021-04-02T14:08:00Z

import std.traits: hasUDA, getUDAs; struct uda(T) {} @uda int var; static assert(hasUDA!(var, uda)); // fails static assert(getUDAs!(var, uda).length == 1); // fails static assert(is(getUDAs!(var, uda)[0] == uda)); // fails

Comment #1 by johan_forsberg_86 — 2021-04-02T18:32:36Z

What scope did you run that in? Also, should udas be able to be templated like that? Wouldn't you have to do @uda!int and uda!int for example? 🤔

Comment #2 by eyal — 2021-04-02T19:52:24Z

UDAs are quite flexible. Can be pretty much anything. With @uda!int (or any type rather than a template) it will work.

Comment #3 by robert.schadek — 2024-12-01T16:38:39Z

THIS ISSUE HAS BEEN MOVED TO GITHUB https://github.com/dlang/phobos/issues/9820 DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB