On 01/10/2018 02:46 PM, ag0aep6g wrote:
On 01/10/2018 11:35 PM, Luís Marques wrote:
Due to compatibility with some C code, I basically need to do this:
struct Wrapper
{
int[] x;
}
void main()
{
void* ctxptr = new Wrapper([1, 2, 3]);
auto context = cast(Wrapper*) ctxptr;
writeln(context.x);
}
How can I do that without the wrapper? `new int[]` isn't supported,
even though that's exactly what I want.
If I understand correctly, the goal is to have the `int[]` itself on the
GC heap. You can make an `int[][]` with one element, and then take the
address of that element:
----
void main()
{
int[]* x = &[[1, 2, 3]][0];
int[]* x2 = [[1, 2, 3]].ptr; /* same */
}
----
I was writing the same for a no-initial-value version:
void main() {
void *v = cast(void*)((new int[][](1)).ptr);
*(cast(int[]*)v) ~= 42;
}
I hope it's correct. :o)
Ali
