On the D side, both of the following extern(C) functions take the same
arguments.
1) func1 takes .length and .ptr implicitly as parts of a D array:
extern(C)
void func1(int[] arr) {
assert(arr.equal(3.iota));
}
2) func2 takes .length and .ptr separately and then makes a slice
explicitly:
extern(C)
void func2(size_t length, int * ptr) {
auto arr = ptr[0..length];
assert(arr.equal(3.iota));
}
C side declares and calls both of them the same way:
void func1(size_t length, int * ptr);
void func2(size_t length, int * ptr);
int arr[] = { 0, 1, 2 };
func1(3, arr);
func2(3, arr);
Everything works at least on Linux. Is this kosher, or am I using some
internal knowledge?
Here is the ABI spec:
https://dlang.org/spec/abi.html
One of the DConf Online 2020 slides thanks you! ;)
Ali
