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# clingo_derive
This crate provides the derive macro for the [`clingo::ToSymbol`](https://docs.rs/clingo/0.4.3/clingo/trait.ToSymbol.html) trait.
Datatypes that implement this trait can be added to a [`clingo::FactBase`](https://docs.rs/clingo/0.4.3/clingo/struct.FactBase.html)
In your `Cargo.toml` add:
[dependencies]
clingo-rs = "0.4.3"
clingo-derive = "*"
In your source write:
use clingo_derive::*;
use clingo::FactBase;
#[derive(ToSymbol)]
struct Point {
x: i32,
y: i32,
}
let p = Point{ x:4, y:2 };
let fb = FactBase::new();
fb.insert(p);
The macro performs a conversion to snake case. This means the corresponing fact for `MyPoint{x:3,y:2}` is `my_point(3,2)`.