Arrays of buffer sizes lifetime

[CoffeeExterminator]

Hi, I have found out (the hard way) that the buffer sizes (bufferSize, inputBufferSize, etc.) provided in the configuration as pointers are required even after initialization and thus must be kept alive. Meaning, that if I do something like this

config.bufferSize = (uint64_t *) &size

The size variable must exist even after the initialization is completed, which, at least to me, was not the expected behavior (I understand they are in fact arrays since it's possible to use multiple buffers, but still): my assumption was that I can forget about config entirely after the initialization. Could you please clarify if there are any other parameters passed as pointers required after initialization in a similar manner? What about VkFFTLaunchParams? Are the structure or any of its fields required after VkFFTAppend completion? I have done some tests and it seems like they aren't, but asking just in case anyway.

[fixgoats]

I was literally just figuring out this was the problem I was having with my code and I feel kind of silly for not having figured it out earlier. I think you just need to apply the normal lifetime heuristics: when you assign any pointer to a field in the config, if the data it points to is stack allocated and you go out of the scope where the allocation occurs then you have a dangling pointer. This kind of stuff is why RAII is not just a buzzword but actually a useful practice that makes life a whole lot easier.