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//! This crate provides type-level numbers evaluated at compile time. It depends only on libcore. //! //! The traits defined or used in this crate are used in a typical manner. They can be divided into //! two categories: **marker traits** and **type operators**. //! //! Many of the marker traits have functions defined, but they all do essentially the same thing: //! convert a type into its runtime counterpart, and are really just there for debugging. For //! example, //! //! ```rust //! use typenum::{N4, Integer}; //! //! assert_eq!(N4::to_i32(), -4); //! ``` //! //! **Type operators** are traits that behave as functions at the type level. These are the meat of //! this library. Where possible, traits defined in libcore have been used, but their attached //! functions have not been implemented. //! //! For example, the `Add` trait is implemented for both unsigned and signed integers, but the //! `add` function is not. As there are never any objects of the types defined here, it wouldn't //! make sense to implement it. What is important is its associated type `Output`, which is where //! the addition happens. //! //! ```rust //! use std::ops::Add; //! use typenum::{Integer, P3, P4}; //! //! type X = <P3 as Add<P4>>::Output; //! assert_eq!(<X as Integer>::to_i32(), 7); //! ``` //! //! In addition, helper aliases are defined for type operators. For example, the above snippet //! could be replaced with //! //! ```rust //! use typenum::{Sum, Integer, P3, P4}; //! //! type X = Sum<P3, P4>; //! assert_eq!(<X as Integer>::to_i32(), 7); //! ``` //! //! Documented in each module is the full list of type operators implemented. //! #![no_std] #![warn(missing_docs)] #![cfg_attr(feature = "i128", feature(i128_type))] #![cfg_attr(feature = "strict", deny(missing_docs))] #![cfg_attr(feature = "strict", deny(warnings))] #![cfg_attr(feature = "cargo-clippy", deny(clippy))] #![cfg_attr(feature = "cargo-clippy", allow(type_complexity, len_without_is_empty, new_without_default_derive))] // For debugging macros: // #![feature(trace_macros)] // trace_macros!(true); use core::cmp::Ordering; include!(concat!(env!("OUT_DIR"), "/consts.rs")); include!(concat!(env!("OUT_DIR"), "/op.rs")); pub mod bit; pub mod uint; pub mod int; pub mod private; pub mod marker_traits; pub mod type_operators; pub mod operator_aliases; pub mod array; pub use consts::*; pub use marker_traits::*; pub use type_operators::*; pub use operator_aliases::*; pub use uint::{UInt, UTerm}; pub use int::{NInt, PInt}; pub use array::{ATerm, TArr}; /// A potential output from `Cmp`, this is the type equivalent to the enum variant /// `core::cmp::Ordering::Greater`. #[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy, Hash, Debug, Default)] pub struct Greater; /// A potential output from `Cmp`, this is the type equivalent to the enum variant /// `core::cmp::Ordering::Less`. #[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy, Hash, Debug, Default)] pub struct Less; /// A potential output from `Cmp`, this is the type equivalent to the enum variant /// `core::cmp::Ordering::Equal`. #[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy, Hash, Debug, Default)] pub struct Equal; /// Returns `core::cmp::Ordering::Greater` impl Ord for Greater { #[inline] fn to_ordering() -> Ordering { Ordering::Greater } } /// Returns `core::cmp::Ordering::Less` impl Ord for Less { #[inline] fn to_ordering() -> Ordering { Ordering::Less } } /// Returns `core::cmp::Ordering::Equal` impl Ord for Equal { #[inline] fn to_ordering() -> Ordering { Ordering::Equal } } /// Asserts that two types are the same. #[macro_export] macro_rules! assert_type_eq { ($a:ty, $b:ty) => ( let _: <$a as $crate::Same<$b>>::Output; ); } /// Asserts that a type is `True`, aka `B1`. #[macro_export] macro_rules! assert_type { ($a:ty) => ( let _: <$a as $crate::Same<True>>::Output; ); }