Crate typesize

Typesize

A library to fetch an accurate estimate of the total memory usage of a value.

The goal of this library is to produce the most accurate estimate possible, however without being deeply integrated into the entire ecosystem this cannot be possible. This leads to the real goal being to get “close enough” for getting a sense of memory usage in your program. If one of the TypeSize implementations built-in could be improved, a PR would be greatly appreciated.

An example usage of this library would be to wrap all the types you want to measure recursively in the derive::TypeSize derive macro, and for any types which perform their own heap allocation to manually implement TypeSize while overriding the TypeSize::extra_size method.

Features

Library Support

• arrayvec: Implements TypeSize for ArrayVec of any size.
• simd_json: Implements TypeSize for OwnedValue and StaticNode, enables halfbrown.
• halfbrown: Implements TypeSize for SizedHashMap, enables hashbrown.
• dashmap: Implements TypeSize for DashMap.
• serde_json: Implements TypeSize for serde_json::Value and serde_json::Map.
• hashbrown: Implements TypeSize for hashbrown::HashMap.
• secrecy: Implements TypeSize for Secret.
• chrono: Implements TypeSize for chrono::DateTime of any chrono::TimeZone.
• time: Implements TypeSize for time::OffsetDateTime.
• url: Implements TypeSize for url::Url.

Modules

• derive

Macros

• sizeof_impl
  Implements TypeSize for multiple types based on the return value of std::mem::size_of.

Structs

• Ref
  A wrapper around &T to implement TypeSize.
• RefMut
  A wrapper around &mut T to implement TypeSize.

Traits

• TypeSize
  A trait to fetch an accurate estimate of the total memory usage of a value.