std::marker::PhantomData - Rust

pub struct PhantomData<T> where T: ?Sized;Expand description Zero-sized type used to mark things that “act like” they own a T. Adding a PhantomData<T> field to your type tells the compiler that your type acts as though it stores a value of type T, even though it doesn’t really. This information is used when computing certain safety properties. For a more in-depth explanation of how to use PhantomD

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