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On Friday, 8 September 2023 at 13:32:00 UTC, rempas wrote:
>On Friday, 8 September 2023 at 13:05:47 UTC, evilrat wrote:
>import core.stdc.stdlib;
import core.stdc.stdio;
alias u64 = ulong;
alias i64 = long;
struct Vec(T) {
private:
T* _ptr = null; // The pointer to the data
u64 _cap = 0; // Total amount of elements (not bytes) we can store
u64 _len = 0;
public:
/* Create a vector by just allocating memory for it. The null terminator is not set for
strings as, the vector is considered empty and we should first push something to it
in order to use it! */
this(i64 size) {
this._len = 0;
this._cap = size;
static if (is(T == char)) { size += 1; } // Additional space for the null terminator
this._ptr = cast(T*)malloc(size);
}
ref T opIndex(size_t idx) { return _ptr[idx]; }
}
extern(C)
void main()
//unittest
{
enum el = 3;
auto vec = Vec!char(10);
assert(vec._ptr);
vec[el] = 'h';
assert(vec[el] == 'h');
printf("ptr = %p\n", vec._ptr);
printf("vec ptr = %p\n", &vec[el]);
printf("vec local = %p\n", &vec);
printf("vec[%d] = %c\n", el, vec[el]);
foreach (i; 0..vec._cap) {
printf("-");
}
printf("\n");
foreach (i; 0..vec._cap) {
printf("%d", vec[i]);
}
printf("\n");
printf("run ok\n");
}
ldc2 -betterC -run membug.d
output
ptr = 0x55cb701de2a0
vec ptr = 0x55cb701de2a3
vec local = 0x7fffa1542258
vec[3] = h
----------
000104000000
run ok
I have made a search on the web and I found out one thread that pointed out that it may be a Glibc error. However, because like I said the problem only happens when I assign the returned value to the _ptr field, I just wanted to post here in case someone has a similar experience and if it's a compiler bug in which case, we should report it.
Did you run this example program above? Does it crash?
