On 3/16/22 10:03, user1234 wrote:
> On Wednesday, 16 March 2022 at 14:42:02 UTC, Era Scarecrow wrote:
>> On Wednesday, 16 March 2022 at 11:27:20 UTC, user1234 wrote:
>>> assuming the c library takes by reference
>>
>> My experience all arrays are effectively just pointers
>
> I meant the function that takes the Test2 as parameter, but to be honest
> I dont get exactly what does OP want actually...
They want to pass Test2 to C and be able to use it. D ABI defines arrays
(slices) as a pair of size_t and a pointer:
https://dlang.org/spec/abi.html#arrays
I haven't passed such a struct to C but I believe the equivalent C
struct can assume there are the following members in place of the array:
struct Test2 {
int32_t a;
size_t length;
Test * ptr;
}
However, the lifetime of ptr must be ensured on the D side because
utless there is a reference to it on the D side, the GC can free the
memory at any time and C side may access invalid memory.
That is explained here:
https://dlang.org/spec/interfaceToC.html#storage_allocation
Ali
