4 ms·

I'm not familiar with closures from other languages. What about capturing a shared_ptr by value?

• thrownaway2424 10y ago
  The thing to keep in mind is that copying a shared_ptr isn't cheap at all. It's a class with a pointer and atomic reference count inside and the atomic inc/dec takes many cycles.
  • leni536 10y ago
    How does this compare to the cost of a closure in other languages? Yeah atomic reference counts are not cheap, but basically that's the point of a shared_ptr.
    • thrownaway2424 10y ago
      I'm not sure. I don't program in C++ because I want it to have performance comparable to other languages.