3 ms·

While the overall point is valid, this isn’t strictly true. A Swift string is frequently backed by a contiguous UTC8 buffer terminated with a \0, so passing to

While the overall point is valid, this isn’t strictly true. A Swift string is frequently backed by a contiguous UTC8 buffer terminated with a \0, so passing to C is just a matter of passing the pointer and requires no copies.

maria2 4y ago
But Swift has no way of signaling to C that the memory can be freed so I’m pretty sure it does a copy when using String’s cString constructor.
- saagarjha 4y ago
  When you pass a Swift String to C you do so with a given lifetime. By default this is the duration of the call.