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tylar-0.2.2
tylar
Type-Level Arithmetic in Rust.
Supports addition, subtraction, multiplication and division of (small-ish*) type-level integers.
Inspired by Björn Buckwalter's numtype library for Haskell. Brought to Rust thanks to multidispatch and associated types.
* Numbers in the range (–50,50) should mostly work, depending on the operations. Typechecking might be rather slow.
Example
// N2 is the type for -2, P5 is +5, Out is the result type
// of the addition; new() creates a new instance (actually a
// no-op, since the types are zero-sized) and into() turns
// the object into an integer value, computed at compile-time
// due to static dispatch.
let result: i32 = new.into;
println!; // prints `-2 + 5 = 3`
For more, see examples/basics.rs and run cargo run --example basics
.
Unfortunately these examples (and therefore also cargo test
) do not work with Rust 1.0, but tylar itself is compatible and usable with Rust 1.0.