# rust-typemap

**Repository Path**: rustup/rust-typemap

## Basic Information

- **Project Name**: rust-typemap
- **Description**: from crates.io
- **Primary Language**: Rust
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-10-26
- **Last Updated**: 2021-11-02

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# `TypeMap`

> A typesafe store keyed by types and containing different types of values.

## [Documentation](https://crates.fyi/crates/typemap/0.3.3)

It provides functionality similar to AnyMap, but is more flexible because it
allows for key-value pairs, rather than enforcing that keys and values are the
same type.

Key-value associations are defined through the `Key` trait, which uses an
associated type parameter and trait coherence rules to enforce the invariants
of `TypeMap`.

## Example

```rust
extern crate typemap;
use typemap::{TypeMap, Key};

struct KeyType;

#[derive(Debug, PartialEq)]
struct Value(i32);

impl Key for KeyType { type Value = Value; }

#[test] fn test_pairing() {
    let mut map = TypeMap::new();
    map.insert::<KeyType>(Value(42));
    assert_eq!(*map.get::<KeyType>().unwrap(), Value(42));
}
```