On Wednesday, 29 May 2024 at 07:47:01 UTC, Dakota wrote:
I try use
https://github.com/microsoft/garnet/blob/main/libs/storage/Tsavorite/cc/src/device/native_device_wrapper.cc from D
Not sure how to make this work with D:
```c++
EXPORTED_SYMBOL FASTER::core::Status
NativeDevice_ReadAsync(NativeDevice* device, uint64_t source,
void* dest, uint32_t length, FASTER::core::AsyncIOCallback
callback, void* context) {
return device->ReadAsync(source, dest, length, callback,
context);
}
EXPORTED_SYMBOL FASTER::core::Status
NativeDevice_WriteAsync(NativeDevice* device, const void*
source, uint64_t dest, uint32_t length,
FASTER::core::AsyncIOCallback callback, void* context) {
return device->WriteAsync(source, dest, length, callback,
context);
}
```
I need to define `FASTER::core::AsyncIOCallback callback` from
D, any way to workaround ? (like modify garnet source code to
support pass a C function callback)
I am newbie to C++ and D, any help will be appreciate
(here is the signature of callback)
https://github.com/microsoft/garnet/blob/ade2991f3737b9b5e3151d0dd0b614adfd4bcecd/libs/storage/Tsavorite/cc/src/device/async.h#L25
```cpp
typedef void(*AsyncIOCallback)(IAsyncContext* context, Status
result, size_t bytes_transferred);
```
This can be written as following to match namespace and mangling
scheme, assuming IAsyncContext is opaque pointer here, though I
don't remember if enum need namespace as well.
But no guarantess anyways, try it and adapt it.
Also I can't remember if string list makes proper namespace or
you should put `FASTER.core` instead (without quotes).
```d
enum Status : ubyte {
Ok = 0,
Pending = 1,
NotFound = 2,
OutOfMemory = 3,
IOError = 4,
Corruption = 5,
Aborted = 6,
}
extern(C++, "FASTER", "core")
class IAsyncContext;
alias AsyncIOCallback = extern(C++, "FASTER", "core") void
function(IAsyncContext context, Status result, size_t
bytes_transferred);
```
