Passing static arrays to C
Jakob Bornecrantz
wallbraker at gmail.com
Wed Oct 24 00:54:33 PDT 2012
Hey everybody.
How are you supposed to pass static arrays to C functions? I'm
asking because I'm getting conflicting info from how DMD works
and on IRC.
The below example prints:
test1 0x7fff857c1db0
test2 0x7fff857c1db0
test3 (nil)
test4 0x7fff857c1db0
D:
void main()
{
float[3] arr;
test1(arr);
test2(&arr[0]);
test3(0, arr);
test4(0, &arr[0]);
}
extern(C):
void test1(float[3] arr);
void test2(float *arr);
void test3(int, float[3] arr);
void test4(int, float *arr);
C:
#include <stdio.h>
void test1(float arr[3]) { printf("test1 %p\n", &arr[0]); }
void test2(float arr[3]) { printf("test2 %p\n", &arr[0]); }
void test3(int anything, float arr[3]) { printf("test3 %p\n",
&arr[0]); }
void test4(int anything, float arr[3]) { printf("test4 %p\n",
&arr[0]); }
Comments please.
Cheers, Jakob.
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