rustHow to deal with box overhead in Rust
Box overhead in Rust is the cost of allocating memory on the heap for a type. It is necessary to use boxes when dealing with types that have a size unknown at compile time, such as a Vec<T>
.
Example code:
let x = Box::new(5);
Output:
Box { pointer: 0x7f8f9f9f9f9f }
The code above creates a box containing the value 5
. The output is a pointer to the memory location of the box.
To avoid box overhead, it is possible to use Rc<T>
or Arc<T>
instead of Box<T>
. These types are reference counted pointers that allow multiple references to the same data without allocating memory on the heap.
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