I (eventually) figured out the very obvious solution - just cast the
DynamicStruct back to an AnyStruct, (which is clonable), and keep track of
the schema elsewhere!
On Friday, 19 November 2021 at 19:39:51 UTC ken...@cloudflare.com wrote:
> No, there's no fundamental limitation here. I think we just need an
> overload of `clone()` for this that accounts for the subtle API differences
> with `DynamicStruct`, e.g. passing the `Schema` in various places.
>
> -Kenton
>
> On Thu, Nov 18, 2021 at 6:31 AM Vaci <va...@vaci.org> wrote:
>
>> Hi,
>>
>> Should it be possible to use capnp::clone() to copy a DynamicStruct?
>>
>> This code currently doesn't compile:
>>
>> #include <capnp/dynamic.h>
>> #include <capnp/message.h>
>> #include "foo.capnp.h"
>> int main() {
>> capnp::MallocMessageBuilder mb;
>> auto root = mb.initRoot<Foo>();
>> auto a = root.asReader();
>> auto a2 = capnp::clone(a); // succeeds
>> auto b = capnp::toDynamic(a);
>> auto b2 = capnp::clone(b); // fails
>> }
>>
>> ...but I'm not clear what it is about DynamicStructs that make them less
>> copyable?
>>
>> Cheers,
>> Vaci
>>
>>
>>
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