Template condition triggers compiler error?
Kenji Hara
k.hara.pg at gmail.com
Sun Dec 1 21:21:47 PST 2013
On Sunday, 1 December 2013 at 16:07:18 UTC, Namespace wrote:
> This code compiles:
> ----
> template gc_free(T) {
> static if (is(T : U*, U) || is(T : U[], U))
> alias Type = T;
> else
> alias Type = T*;
>
> void gc_free(Type data) {
> import core.memory : GC;
>
> static if (is(Type : U[], U)) {
> GC.free(data.ptr);
> GC.minimize();
> } else {
> GC.free(data);
> }
>
> data = null;
> }
> }
> ----
>
> But with a template condition it triggers compiler errors:
> ----
> template gc_free(T) if (!is(T == class)) {
> static if (is(T : U*, U) || is(T : U[], U))
> alias Type = T;
> else
> alias Type = T*;
>
> void gc_free(Type data) {
> import core.memory : GC;
>
> static if (is(Type : U[], U)) {
> GC.free(data.ptr);
> GC.minimize();
> } else {
> GC.free(data);
> }
>
> data = null;
> }
> }
> ----
>
> Errors:
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(177): Error: template instance share.share!(A) error
> instantiating
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(197): Error: template instance share.share!(A) error
> instantiating
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
> share.d(10): Error: undefined identifier Type
>
> It seems to work on Linux with 64 bit, but it fails on Windows
> 7 32 bit.
>
> Bug, feature or my fault?
Compiler bug.
https://d.puremagic.com/issues/show_bug.cgi?id=11662
Kenji Hara
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