← Back to index | Original Bugzilla link

Bug 8256 – mixin() doesn't work in a template declaration

Status: RESOLVED
Resolution: WONTFIX
Severity: enhancement
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2012-06-16T17:53:32Z
Last change time: 2018-05-05T13:02:40Z
Assigned to: No Owner
Creator: dlang+issues

Comments

Comment #0 by dlang+issues — 2012-06-16T17:53:32Z

string getTypeName() { return "int"; } template Foo(T = mixin(getTypeName())) { }

Comment #1 by k.hara.pg — 2012-06-17T00:22:55Z

This is not allowed in current spec. http://dlang.org/expression.html#MixinExpression MixinExpression is an expression, not a type. template Foo(T = mixin(getTypeName())) { } ^ There should be a type. And the text contents of the string must be compilable as a valid AssignExpression.

Comment #2 by dlang+issues — 2012-06-17T01:37:22Z

Oh hmm, I see... any chance that it might be allowed at some point? :D

Comment #3 by k.hara.pg — 2012-06-17T02:05:15Z

Workaround(not tested): template Foo(T = typeof(mixin(getTypeName()).init)) { }

Comment #4 by dlang+issues — 2012-06-17T02:12:42Z

Oh cool, that works! Thanks!

Comment #5 by oli_r — 2018-05-05T13:02:40Z

I consider this solved. Please reopen if there is any implicit, actual request associated with this.