Comment by usefulcat
4 hours ago
> C++ smart pointers (eg std::unique_ptr<>) are likewise to handle ownership and incur a runtime cost where in Rust they are handled by the compiler with no runtime cost.
What additional runtime cost is incurred by the use of std::unique_ptr? Either compared to Rust or compared to doing manual memory management in c++?
Not your parent, but there are two ways:
1. If you use a custom deleter, then there's extra stuff to store that. this isn't common, and this API isn't available in Rust, so... not the best argument here.
2. There's ABI requirements that cause it to be passed in memory, see here for details: https://stackoverflow.com/questions/58339165/why-can-a-t-be-...