I'm trying to do something to this effect:

template XYZ(Class) {
...
static assert(index != -1, "No such annotation on " ~ typeid(Class));
...
}

However, typeid is not a string and I can't do to!string. Nor is typeid().name implemented at compile time.
What would be the correct way to do this?

On Saturday, 25 January 2014 at 11:28:40 UTC, Martin Cejp wrote:
> I'm trying to do something to this effect:
>
> template XYZ(Class) {
> ...
> static assert(index != -1, "No such annotation on " ~ typeid(Class));
> ...
> }
>
> However, typeid is not a string and I can't do to!string. Nor is typeid().name implemented at compile time.
> What would be the correct way to do this?

Class.stringof perhaps?

I think what you are looking for is Class.stringof:

    template XYZ(Class)
    {
        // ...
        static assert(index != -1,
            "No such annotation on "~ Class.stringof)
            );
        // ...
    }

On Saturday, 25 January 2014 at 11:41:54 UTC, Rikki Cattermole
wrote:
> ...

Damn, beaten by 1 second!

On Saturday, 25 January 2014 at 11:28:40 UTC, Martin Cejp wrote:
> I'm trying to do something to this effect:
>
> template XYZ(Class) {
> ...
> static assert(index != -1, "No such annotation on " ~ typeid(Class));
> ...
> }
>
> However, typeid is not a string and I can't do to!string. Nor is typeid().name implemented at compile time.
> What would be the correct way to do this?

for just printing `Class.stringof` is most simple thing to do. There are also `__traits(identifier, Class)` and `std.traits.fullyQualifiedName!Class` that are more specialized and usually used in code generation.

On Saturday, 25 January 2014 at 11:44:04 UTC, Dicebot wrote:
> On Saturday, 25 January 2014 at 11:28:40 UTC, Martin Cejp wrote:
>> I'm trying to do something to this effect:
>>
>> template XYZ(Class) {
>> ...
>> static assert(index != -1, "No such annotation on " ~ typeid(Class));
>> ...
>> }
>>
>> However, typeid is not a string and I can't do to!string. Nor is typeid().name implemented at compile time.
>> What would be the correct way to do this?
>
> for just printing `Class.stringof` is most simple thing to do. There are also `__traits(identifier, Class)` and `std.traits.fullyQualifiedName!Class` that are more specialized and usually used in code generation.

Thanks, that will do.
fullyQualifiedName was the first that came to mind, but it's broken.

alias Field = typeof(__traits(getMember, Vertex, fieldName));

const bool normalized = HasAnnotation!(Vertex, fieldName, Normalized);
const int fieldOffset = __traits(getMember, Vertex.init, fieldName).offsetof;

int i = GetAnnotationInstance!(Vertex, fieldName, Position).pos;

glVertexAttribPointer(i, cast(GLint) numElements!Field, TypeToGLEnum!(ElementType!Field),
        normalized ? GL_TRUE : GL_FALSE, Vertex.sizeof, cast(void*) fieldOffset);
glEnableVertexAttribArray(i);


I'm starting to like this language :-)