D array to void* and back
ref2401 via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Mon Aug 3 14:23:38 PDT 2015
Hello everyone,
I pass a D array as void* into a function.
When I'm trying to cast a void* parameter to a D array I get
'Access Violation' error.
However if I define ArrayLike struct which looks like D array
then casting will succeed.
What should I do? Should I stick to ArrayLike wrapper and just
live? :)
struct ArrayLike(T) {
this(T[] arr) {
ptr = arr.ptr;
length = arr.length;
}
T* ptr;
size_t length;
T[] asArray() {
return ptr[0 .. length];
}
}
void funcLibC_Array(void* data) {
int[] arr = *cast(int[]*)data;
writeln("funcLibC_Array: ", arr);
}
void funcLibC_ArrayLike(void* data) {
ArrayLike!int arrLike = *cast(ArrayLike!int*)data;
writeln("funcLibC_ArrayLike: ", arrLike.asArray());
}
void main(string[] args) {
int[] arr = [1, 2, 3];
auto arrLike = ArrayLike!int(arr);
funcLibC_ArrayLike(&arrLike);
funcLibC_Array(arr.ptr); // 'Access Violation error' is thrown
here.
}
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