# Smart accessors for Rust
[](https://crates.io/crates/smart_access/)
[](https://docs.rs/smart_access/)
## Overview
There are many sorts of “smart pointers”. They have following things in common:
* a simple protocol for accessing the data (make some bookkeeping and then give something equivalent to a raw pointer to the data)
* some nontrivial logic of ownership management
This crate provides “smart accessors”:
* they aren't concerned with questions of ownership
* they give a _bidirectional view_ of the data: updating the accessed data can
cause a nontrivial change of other data linked with the data being accessed
* the accessed view can be entirely virtual: it can be constructed only for the
duration of the access
For code examples see [the docs](https://docs.rs/smart_access/).
## Usage
Simply include
```
smart_access = "0.7"
```
in your `Cargo.toml`.
### Variants
The library, although being very small, includes some pluggable components.
For a bare-bones version use
```
smart_access = { version = "0.7", default-features = false }
```
But usually you'll want something more convenient.
#### Accessors for Vec, HashMap and BTreeMap
```
smart_access = { version = "0.7", default-features = false, features = ["collections", "hashbrown"] }
```
#### A maximal `no_std` and no-`alloc` variant
```
smart_access = { version = "0.7", default-features = false, features = ["batch_ct", "detach", "traversal"] }
```
## Versions
* `0.7.0`: Now fully independent of `std`.
* `0.6.2`: An accessor to the `Vec`-owned slice + some doc improvements.
* `0.6.1`: Fixed iterator accessors panicking on too large ranges.
* `0.6.0`: Accessors for iterators + `get_clone` method on the `Cps` trait.
* `0.5.4`: Accessors for stdlib sets + doc improvements.
* `0.5.3`: A new sort of map accessors (wrapping `and_modify(..).or_insert(..)`).
* `0.5.2`: Added a macro for forming pathlike types.
* `0.5.1`: Some errors in the documentation fixed. A concrete type of detached paths is now public.
* `0.5.0`: A change in the presentation of the `AT` struct. The `detach` feature reworked. Docs now have a version migration guide.
* `0.4.1`: Fixed some serious bugs in the `detach`-enabled version of the crate.
* `0.4.0`: Public API for using access batches as function inputs/outputs.
* `0.3.0`: Public API for using detached accessors as function inputs/outputs.
* `0.2.2`: New feature `detach` allows one to detach an accessor from the source of the data accessed.
* `0.2.1`: Now really works on `no_std`.
* `0.2.0`: Simplistic batch editing + breaking change for rt-batches + doc improvements.
* `0.1.2`: A bit more user-friendly docs.
* `0.1.1`: Only the README has been updated.
* `0.1.0`: The first iteration.