4 ms·

It's quite possible to not use alloca(), but just use C++'s placement new operator to re-use memory already allocated on the stack. I'm not sure if Rust has so

• CyberDildonics 12y ago
  That is a valid and useful technique, but being able to dynamically allocate stack memory in the first place is separate from using placement new on stack memory.
  • berkut 12y ago
    Of course, I was just pointing out it's not always necessary to use alloca - I've written a production-level path-tracer without needing to allocate stack memory dynamically.
• steveklabnik 12y ago
  User-defined placement new and custom allocators for existing data structures are still being worked on. `box` can do a form of placement new already, and while you can use your own allocator, you can't use it with already-existing types.