Share on Facebook (Opens in new window)
Alison Francis,Senior Science Journalist
，更多细节参见wps
While this instance lookup might seem trivial and obvious, it highlights a hidden superpower of the trait system, which is that it gives us dependency injection for free. Our Display implementation for Person is able to require an implementation of Display for Name inside the where clause, without explicitly declaring that dependency anywhere else. This means that when we define the Person struct, we don't have to declare up front that Name needs to implement Display. And similarly, the Display trait doesn't need to worry about how Person gets a Display instance for Name.
The injection program consists of any .cpp file in the src/ folder. To modify another process via Mach APIs, our injection program needs entitlements so macOS actually allows it to be a bit nasty. Entitlements are embedded in an executable via code signing. The custom command calls into Xcode's codesign tool, telling it to embed the entitlements in the file entitlements.plist, which looks like this:
Фон дер Ляйен оценила идею вернуться к российскому топливу14:54