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Обсуждение на тему: Rust sized
Rust sized
The special syntax ?sized can be used to remove this bound if its not appropriate. Struct bart ?sized(t) struct foouse(fooi32) error sized is not implemented for i32 struct baruse(bari32) ok. In rust all generic type parameters are sized by default everywhere - in functions, in structs and in traits. They have an implicit sized bound sized is a trait for marking sized types fn genericfnt sized(x t) - t . Rust (sized) (dst) box dst (dyn trait) trait dstthe syntax ?sized in rust does not mean unsized or dynamically sized.
The special syntax ?sized can be used to remove this bound if its not appropriate. Learn what dynamically sized types (dsts) are in rust, how they differ from sized types, and how to use them in generic and trait contexts. Dsts are types with a size that is known only at run-time, such as slices and trait objects. In rust a type is sized if its size in bytes can be determined at compile-time.
Determining a types size is important for being able to allocate enough space for instances of that type on the stack. Rust необходимо знать некоторые детали о типах, например, сколько места нужно выделить для значения определённого типа. To work with dsts, rust provides the sized trait to determine whether or not a types size is known at compile time. This trait is automatically implemented for everything whose size is known at compile time.
In addition, rust implicitly adds a bound on sized to every generic function. An important piece in my story about trait objects in rust 0 is the sized trait, so im slotting in this short post between my discussion of low-level details and the post on object safety. Sized is a (very) special compiler built-in trait that is automatically implemented or not based on the sizedness of a type. .