Enum-to-types

Macro for generating pseudo-enums for type-level programming. This is somewhat like https://github.com/fmease/tylift but implemented with macro_rules! syntax.

Install

toml [dependencies] enum_to_types = "0.1.0"

```rust use enumtotypes::enumtotypes; use std::marker::PhantomData;

enumtotypes!(AccessLevel; User, Admin);

struct DataStorage(i32, PhantomData);

impl DataStorage { fn new(i: i32) -> Self { Self(i, PhantomData) } }

trait ReadStorage { fn read(&self) -> i32; }

impl ReadStorage for DataStorage { fn read(&self) -> i32 { self.0 } }

impl ReadStorage for DataStorage { fn read(&self) -> i32 { self.0 } }

impl ReadStorage for DataStorage { fn read(&self) -> i32 { self.0 } }

impl ReadStorage for DataStorage { fn read(&self) -> i32 { panic!("You have no rights to read this"); } }

fn main() { let storage = DataStorage::::new(1); asserteq!( as ReadStorage>::read(&storage), 1); let storage = DataStorage::::new(5); asserteq!( as ReadStorage>::read(&storage), 5); // reading storage with AccessLevel::Admin by user will cause panic } ```

This may look very verbose, but it gives a lot of flexibility. Also, other examples can look less verbose.