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Co-authored-by: Camelid <camelidcamel@gmail.com>
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Max Sharnoff 2020-12-09 23:13:24 +00:00 committed by GitHub
parent 1c36bb2f69
commit 72a7f73610
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1 changed files with 4 additions and 4 deletions
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8
library/core/src/any.rs
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@ -17,11 +17,12 @@
//! # Smart pointers and `dyn Any` //! # Smart pointers and `dyn Any`
//! //!
//! One piece of behavior to keep in mind when using `Any` as a trait object, //! One piece of behavior to keep in mind when using `Any` as a trait object,
//! especially with types like `Box<dyn Any>` or `Arc<dyn Any>` is that simply //! especially with types like `Box<dyn Any>` or `Arc<dyn Any>`, is that simply
//! calling `.type_id()` on the value will produce the `TypeId` of the //! calling `.type_id()` on the value will produce the `TypeId` of the
//! container, and not the underlying trait object. This can be avoided //! *container*, not the underlying trait object. This can be avoided by
//! converting the smart pointer into a `&dyn Any` instead, which will return //! converting the smart pointer into a `&dyn Any` instead, which will return
//! the object's type id. For example: //! the object's `TypeId`. For example:
//!
//! ``` //! ```
//! use std::any::{Any, TypeId}; //! use std::any::{Any, TypeId};
//! //!
@ -32,7 +33,6 @@
//! // ... than this: //! // ... than this:
//! let boxed_id = boxed.type_id(); //! let boxed_id = boxed.type_id();
//! //!
//! // Both of these assertions pass
//! assert_eq!(actual_id, TypeId::of::<i32>()); //! assert_eq!(actual_id, TypeId::of::<i32>());
//! assert_eq!(boxed_id, TypeId::of::<Box<dyn Any>>()); //! assert_eq!(boxed_id, TypeId::of::<Box<dyn Any>>());
//! ``` //! ```