My library is generating a typeid from somewhere.
e.g.
typeid(const(Pointer!(cast(AddrSpace)1u, float)))

but I have never declared a const of that type nor have I used typeid explicitly in my program. Where is this coming from?

The program is just:

enum AddrSpace {
    Global,
    Shared
}
struct Pointer(AddrSpace n,T)
{
    T* ptr;
}
private import std.traits;
struct AutoIndexed(T) if (isInstanceOf(T,Pointer))
{
    T p = void;
    enum  n = TemplateArgsOf!(T)[0];
    alias U = TemplateArgsOf!(T)[1];
    static assert(n == AddrSpace.Global || n == AddrSpace.Shared);

    @property U index()
    {
        static if (n == AddrSpace.Global)
            return p[0]; //Some calculation
        else static if (n == AddrSpace.Shared)
            return p[0];// ditto

    }

    @property void index(U t)
    {
        static if (n == AddrSpace.Global)
            p[0] = t; // ditto
        else static if (n == AddrSpace.Shared)
            p[0] = t; // ditto
    }
    @disable this();
    alias index this;
}

alias aagf = AutoIndexed!(GlobalPointer!(float));

@kernel void auto_index_test(aagf a,
                             aagf b,
                             aagf c)
{
    a = b + c;
}

On Friday, 7 July 2017 at 08:49:58 UTC, Nicholas Wilson wrote:
> My library is generating a typeid from somewhere.
> e.g.
> typeid(const(Pointer!(cast(AddrSpace)1u, float)))
>
> [...]

It seems to be coming from the need to hash the type, goodness knows why, which explains why I only get the const variety.

On 08/07/2017 2:35 AM, Nicholas Wilson wrote:
> On Friday, 7 July 2017 at 08:49:58 UTC, Nicholas Wilson wrote:
>> My library is generating a typeid from somewhere.
>> e.g.
>> typeid(const(Pointer!(cast(AddrSpace)1u, float)))
>>
>> [...]
> 
> It seems to be coming from the need to hash the type, goodness knows why, which explains why I only get the const variety.

https://github.com/dlang/druntime/blob/master/src/object.d#L253 Maybe?

On Saturday, 8 July 2017 at 05:36:49 UTC, rikki cattermole wrote:
> On 08/07/2017 2:35 AM, Nicholas Wilson wrote:
>> On Friday, 7 July 2017 at 08:49:58 UTC, Nicholas Wilson wrote:
>>> My library is generating a typeid from somewhere.
>>> e.g.
>>> typeid(const(Pointer!(cast(AddrSpace)1u, float)))
>>>
>>> [...]
>> 
>> It seems to be coming from the need to hash the type, goodness knows why, which explains why I only get the const variety.
>
> https://github.com/dlang/druntime/blob/master/src/object.d#L253 Maybe?

No, the culprit is
https://github.com/dlang/druntime/blob/master/src/object.d#L1128
but IDK why it is being generated in the first place since nothing I wrote relies on being able to hash it.

On 08.07.2017 07:55, Nicholas Wilson wrote:
> On Saturday, 8 July 2017 at 05:36:49 UTC, rikki cattermole wrote:
>> On 08/07/2017 2:35 AM, Nicholas Wilson wrote:
>>> On Friday, 7 July 2017 at 08:49:58 UTC, Nicholas Wilson wrote:
>>>> My library is generating a typeid from somewhere.
>>>> e.g.
>>>> typeid(const(Pointer!(cast(AddrSpace)1u, float)))
>>>>
>>>> [...]
>>>
>>> It seems to be coming from the need to hash the type, goodness knows why, which explains why I only get the const variety.
>>
>> https://github.com/dlang/druntime/blob/master/src/object.d#L253 Maybe?
> 
> No, the culprit is
> https://github.com/dlang/druntime/blob/master/src/object.d#L1128
> but IDK why it is being generated in the first place since nothing I wrote relies on being able to hash it.

I suspect this is generated while building the hash function for your Pointer struct in buildXtoHash in ddmd/clone.d.

On Saturday, 8 July 2017 at 08:56:17 UTC, Rainer Schuetze wrote:
>
>
> On 08.07.2017 07:55, Nicholas Wilson wrote:
>> On Saturday, 8 July 2017 at 05:36:49 UTC, rikki cattermole wrote:
>>> On 08/07/2017 2:35 AM, Nicholas Wilson wrote:
>>>> On Friday, 7 July 2017 at 08:49:58 UTC, Nicholas Wilson wrote:
>>>>> My library is generating a typeid from somewhere.
>>>>> e.g.
>>>>> typeid(const(Pointer!(cast(AddrSpace)1u, float)))
>>>>>
>>>>> [...]
>>>>
>>>> It seems to be coming from the need to hash the type, goodness knows why, which explains why I only get the const variety.
>>>
>>> https://github.com/dlang/druntime/blob/master/src/object.d#L253 Maybe?
>> 
>> No, the culprit is
>> https://github.com/dlang/druntime/blob/master/src/object.d#L1128
>> but IDK why it is being generated in the first place since nothing I wrote relies on being able to hash it.
>
> I suspect this is generated while building the hash function for your Pointer struct in buildXtoHash in ddmd/clone.d.

Hmm, I found needToHash(StructDeclaration sd) which enumerates the fields
If a field is a struct
    recurse, makes sense
    if the struct has an alias this, which Pointer does, generate a typeinfo, with a note to see https://issues.dlang.org/show_bug.cgi?id=14948 / dmdPR 5001.