# common_macros [](https://crates.io/crates/common_macros) [](https://docs.rs/common_macros) [](https://img.shields.io/badge/maintenance-passively--maintained-blue.svg) [](https://opensource.org/licenses/MIT) [](https://opensource.org/licenses/Apache-2.0)
**provides common macros like `hash_map!`
---
Rust crate providing some common macros.
Currently following macros are exported:
- `hash_map!`
- `hash_set!`
- `b_tree_map!`
- `b_tree_set!`
- `const_expr_count!`
## Example
```rust
use std::collections::HashMap;
use common_macros::hash_map;
fn main() {
let map_a = hash_map! {
"foo" => vec![0,1,2],
"bar" => vec![3,4,5]
};
// expands to roughly
let map_b = {
let mut map = HashMap::with_capacity(2);
map.insert("foo", vec![0,1,2]);
map.insert("bar", vec![3,4,5]);
map
};
assert_eq!(map_a, map_b);
}
```
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.