Summary:
`SharedFunction` implements a pattern of a shared callable object that contains the same executable inside. It's similar to `std::function` with one important difference: when the object is copied, the stored function (and captured values) are shared between instances (not copied).
`SharedFunction` can be stored inside `std::function` because it's callable.
It useful in some scenarios, such as:
* When captured by `std::function` arguments are not copyable;
* When we need to replace the content of the callable later on the go.
We will use it in the coming diffs.
Reviewed By: mdvacca
Differential Revision: D14072078
fbshipit-source-id: 9df4ad2d1b92394e2dfef5c283f35c7c0bd4b500
Summary:
`Better` is a trivial collection of basic tools borrowed from other low-level general purpose libraries (like Folly, Abseil or Boost). The main goals of Better:
- Make the codebase more portable;
- Make the dependency list explicit (by decoupling it as a dependency list of Better);
- Make relying on modern C++ patterns and tools in code simple and easy.
- Make executing experiments with different dependencies easier.
As a first example usage, this diff replaces std::unordered_map with an efficient one from folly on the one of the hottest paths.
Reviewed By: JoshuaGross
Differential Revision: D13944565
fbshipit-source-id: 5fa2c4abe6c17f7361eddcc25f968b6440d5d9db
Jonathan Kim
Valentin Shergin