Re: Convert C array pointer to a D slice without data copy
On Monday, 18 May 2015 at 09:18:33 UTC, ParticlePeter wrote: I get the point to an array from a c function, the data size from another function. The data should be only readable at the D side, but I would like to use it as a D slice without copying the data. Is this possible ? char* dataPtr; size_t dataLen; auto data = dataPtr[0 .. dataLen]; This doesn't do any copying. BUT I am not sure what GC would be doing about it. After you use it, you might want to set `data` to null in case of a problem.
Re: Convert C array pointer to a D slice without data copy
Am Mon, 18 May 2015 09:51:48 + schrieb "John Colvin" : > No need to worry about the GC here, it only scans the stack and > its own heap (unless you specifically add a new root). And even if you add a root it wont free anything it did not allocate itself! You could even append to your C array. It will check how much capacity the slice still has on the GC heap and after realizing the .ptr is not even in one of its pools, allocate a GC copy of the C array right away. -- Marco
Re: Convert C array pointer to a D slice without data copy
On Monday, 18 May 2015 at 09:23:26 UTC, tcak wrote: On Monday, 18 May 2015 at 09:18:33 UTC, ParticlePeter wrote: I get the point to an array from a c function, the data size from another function. The data should be only readable at the D side, but I would like to use it as a D slice without copying the data. Is this possible ? char* dataPtr; size_t dataLen; auto data = dataPtr[0 .. dataLen]; This doesn't do any copying. BUT I am not sure what GC would be doing about it. After you use it, you might want to set `data` to null in case of a problem. Thanks, works. Should be in the "Interfacing to C" Reference Article.
Re: Convert C array pointer to a D slice without data copy
On Monday, 18 May 2015 at 09:23:26 UTC, tcak wrote: On Monday, 18 May 2015 at 09:18:33 UTC, ParticlePeter wrote: I get the point to an array from a c function, the data size from another function. The data should be only readable at the D side, but I would like to use it as a D slice without copying the data. Is this possible ? char* dataPtr; size_t dataLen; auto data = dataPtr[0 .. dataLen]; This doesn't do any copying. BUT I am not sure what GC would be doing about it. After you use it, you might want to set `data` to null in case of a problem. No need to worry about the GC here, it only scans the stack and its own heap (unless you specifically add a new root).