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//! A small macro library providing safe, easy, and zero-cost way to construct //! constant or literal instances of the `NonZero*` types from [`core::num`]. //! //! The parameters to the macro must be constants expressions, but they can be //! arbitrary arithmetic, calls to const fns, etc. They're fully evaluated and //! checked for `NonZero`-ness at compile time, and thus have truly no cost — //! even in debug mode. //! //! All misuse is detected at compile time, which can make it much easier to //! audit and be confident there's no problems with the complex expression used //! to initialized one `NonZero` or another. //! //! # Overview //! //! This crate provides 12 macros for constructing constants, one for each //! non-zero integral type. //! //! - [`nonzero_lit::usize!`](crate::usize), producing a //! [`core::num::NonZeroUsize`]. //! - [`nonzero_lit::isize!`](crate::isize), producing a //! [`core::num::NonZeroIsize`]. //! - [`nonzero_lit::u128!`](crate::u128), producing a //! [`core::num::NonZeroU128`]. //! - [`nonzero_lit::i128!`](crate::i128), producing a //! [`core::num::NonZeroI128`]. //! - [`nonzero_lit::u64!`](crate::u64), producing a [`core::num::NonZeroU64`]. //! - [`nonzero_lit::i64!`](crate::i64), producing a [`core::num::NonZeroI64`]. //! - [`nonzero_lit::u32!`](crate::u32), producing a [`core::num::NonZeroU32`]. //! - [`nonzero_lit::i32!`](crate::i32), producing a [`core::num::NonZeroI32`]. //! - [`nonzero_lit::u16!`](crate::u16), producing a [`core::num::NonZeroU16`]. //! - [`nonzero_lit::i16!`](crate::i16), producing a [`core::num::NonZeroI16`]. //! - [`nonzero_lit::u8!`](crate::u8), producing a [`core::num::NonZeroU8`]. //! - [`nonzero_lit::i8!`](crate::i8), producing a [`core::num::NonZeroI8`]. //! //! # Features //! //! - Crate fully supports `no_std`. //! - All `NonZero` types are supported. //! - Fully zero cost, even for debug builds (we always evaluate the constant as //! a `const`). //! - Input to the macros can be arbitrary constant expressions. This includes //! `const fn` calls, which would be more difficult to verify the result as //! non-zero by hand. //! - Misuse (trying to make a `NonZero$Int` with a zero value) is always //! detected at compile time, even when the macro is not being used to //! initialize a constant. //! - No unsafe code. //! //! # Examples //! //! ### Basic usage //! //! ``` //! let x = nonzero_lit::i32!(4); //! assert_eq!(x.get(), 4); //! ``` //! //! ### Constants //! //! #### Basic Constants //! ``` //! const FERRIS: core::num::NonZeroU32 = nonzero_lit::u32!(0xf34415); //! assert_eq!(FERRIS.get(), 0xf34415); //! ``` //! //! #### Use in `const fn` //! //! There's no restriction on use in `const fn` (as there are with some constant //! macros): //! ``` //! const fn get_magic() -> core::num::NonZeroU32 { //! nonzero_lit::u32!(25252) //! } //! assert_eq!(get_magic().get(), 25252) //! ``` //! //! However, note that the parameters to the macro still must be constants. //! //! #### Complex Expressions //! //! Arbitrary constant expressions (including `const fn`s) are allowed. //! //! ``` //! use core::num::NonZeroU64; //! //! const MASK: NonZeroU64 = nonzero_lit::u64!(0xffff_00ff_00ff_0f0f); //! const MASKEE: NonZeroU64 = nonzero_lit::u64!(0xaabb_ccdd_eeff_1122); //! // Note: as the complexity increases, it might become less trivial to //! // verify that the result of an expression is not zero. //! const MASKED: NonZeroU64 = nonzero_lit::u64!(MASK.get() & MASKEE.get()); //! assert_eq!(MASKED.get(), 0xaabb_00dd_00ff_0102_u64); //! ``` //! //! ### Zero Detection //! //! These tests are deliberately fail to compile, to demonstrate that we detect //! misuse at compile time. //! //! #### Basic Zero Detection //! //! If an attempt to construct a zero NonZero is made, a compile error is //! emitted. //! ```compile_fail //! const OH_NO: core::num::NonZeroU8 = nonzero_lit::i8!(0); //! # let _ = OH_NO; // silence unused warning //! ``` //! //! #### Complex and Non-`const` Zero Detection //! Zero detection works for complex expressions, even when not initializing a //! constant (and even both simultaneously). //! ```compile_fail //! let shucks = nonzero_lit::i128!(i128::MIN.count_zeros()); //! # let _ = shucks; // silence unused warning //! ``` //! //! #### Robust against disabling `const_err` lint //! Zero detection even works in the face of `#[allow(const_err)]` (which can //! frequently be used to bypast const evaluation checks of this sort). //! ```compile_fail //! #![allow(const_err)] //! use core::num::NonZeroU16; //! //! const UH_OH: NonZeroU16 = nonzero_lit::u16!(30 / !0); //! # let _ = UH_OH; // silence unused warning //! ``` #![no_std] #![forbid(unsafe_code)] /// Create a literal [`NonZeroUsize`](core::num::NonZeroUsize). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::usize!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: usize = 5; /// const B: core::num::NonZeroUsize = nonzero_lit::usize!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroUsize = nonzero_lit::usize!(0); /// ``` /// /// Macro is robust in the face of `#[allow(...)]`. /// ```compile_fail /// # use nonzero_lit::usize; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroUsize = nonzero_lit::usize!(0); /// ``` /// /// /// ```compile_fail /// let zero = nonzero_lit::usize!(usize::MAX.wrapping_add(1)); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::usize; /// let bar = 3; /// let foo = nonzero_lit::usize!(bar); /// ``` #[macro_export] macro_rules! usize { ($val:expr $(,)?) => {{ const __E: usize = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroUsize = $crate::_private::nz_usize(__E); NZ } }}; } /// Create a literal [`NonZeroIsize`](core::num::NonZeroIsize). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::isize!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: isize = 5; /// const B: core::num::NonZeroIsize = nonzero_lit::isize!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroIsize = nonzero_lit::isize!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::isize; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroIsize = nonzero_lit::isize!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::isize; /// let bar = 3; /// let foo = nonzero_lit::isize!(bar); /// ``` #[macro_export] macro_rules! isize { ($val:expr $(,)?) => {{ const __E: isize = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroIsize = $crate::_private::nz_isize(__E); NZ } }}; } /// Create a literal [`NonZeroU8`](core::num::NonZeroU8). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::u8!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: u8 = 5; /// const B: core::num::NonZeroU8 = nonzero_lit::u8!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroU8 = nonzero_lit::u8!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::u8; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroU8 = nonzero_lit::u8!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::u8; /// let bar = 3; /// let foo = nonzero_lit::u8!(bar); /// ``` #[macro_export] macro_rules! u8 { ($val:expr $(,)?) => {{ const __E: u8 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroU8 = $crate::_private::nz_u8(__E); NZ } }}; } /// Create a literal [`NonZeroI8`](core::num::NonZeroI8). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::i8!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: i8 = 5; /// const B: core::num::NonZeroI8 = nonzero_lit::i8!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroI8 = nonzero_lit::i8!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::i8; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroI8 = nonzero_lit::i8!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::i8; /// let bar = 3; /// let foo = nonzero_lit::i8!(bar); /// ``` #[macro_export] macro_rules! i8 { ($val:expr $(,)?) => {{ const __E: i8 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroI8 = $crate::_private::nz_i8(__E); NZ } }}; } /// Create a literal [`NonZeroU16`](core::num::NonZeroU16). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::u16!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: u16 = 5; /// const B: core::num::NonZeroU16 = nonzero_lit::u16!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroU16 = nonzero_lit::u16!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::u16; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroU16 = nonzero_lit::u16!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::u16; /// let bar = 3; /// let foo = nonzero_lit::u16!(bar); /// ``` #[macro_export] macro_rules! u16 { ($val:expr $(,)?) => {{ const __E: u16 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroU16 = $crate::_private::nz_u16(__E); NZ } }}; } /// Create a literal [`NonZeroI16`](core::num::NonZeroI16). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::i16!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: i16 = 5; /// const B: core::num::NonZeroI16 = nonzero_lit::i16!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroI16 = nonzero_lit::i16!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::i16; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroI16 = nonzero_lit::i16!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::i16; /// let bar = 3; /// let foo = nonzero_lit::i16!(bar); /// ``` #[macro_export] macro_rules! i16 { ($val:expr $(,)?) => {{ const __E: i16 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroI16 = $crate::_private::nz_i16(__E); NZ } }}; } /// Create a literal [`NonZeroU32`](core::num::NonZeroU32). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::u32!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: u32 = 5; /// const B: core::num::NonZeroU32 = nonzero_lit::u32!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroU32 = nonzero_lit::u32!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::u32; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroU32 = nonzero_lit::u32!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::u32; /// let bar = 3; /// let foo = nonzero_lit::u32!(bar); /// ``` #[macro_export] macro_rules! u32 { ($val:expr $(,)?) => {{ const __E: u32 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroU32 = $crate::_private::nz_u32(__E); NZ } }}; } /// Create a literal [`NonZeroI32`](core::num::NonZeroI32). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::i32!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: i32 = 5; /// const B: core::num::NonZeroI32 = nonzero_lit::i32!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroI32 = nonzero_lit::i32!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::i32; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroI32 = nonzero_lit::i32!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::i32; /// let bar = 3; /// let foo = nonzero_lit::i32!(bar); /// ``` #[macro_export] macro_rules! i32 { ($val:expr $(,)?) => {{ const __E: i32 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroI32 = $crate::_private::nz_i32(__E); NZ } }}; } /// Create a literal [`NonZeroU64`](core::num::NonZeroU64). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::u64!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: u64 = 5; /// const B: core::num::NonZeroU64 = nonzero_lit::u64!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroU64 = nonzero_lit::u64!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::u64; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroU64 = nonzero_lit::u64!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::u64; /// let bar = 3; /// let foo = nonzero_lit::u64!(bar); /// ``` #[macro_export] macro_rules! u64 { ($val:expr $(,)?) => {{ const __E: u64 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroU64 = $crate::_private::nz_u64(__E); NZ } }}; } /// Create a literal [`NonZeroI64`](core::num::NonZeroI64). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::i64!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: i64 = 5; /// const B: core::num::NonZeroI64 = nonzero_lit::i64!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroI64 = nonzero_lit::i64!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::i64; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroI64 = nonzero_lit::i64!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::i64; /// let bar = 3; /// let foo = nonzero_lit::i64!(bar); /// ``` #[macro_export] macro_rules! i64 { ($val:expr $(,)?) => {{ const __E: i64 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroI64 = $crate::_private::nz_i64(__E); NZ } }}; } /// Create a literal [`NonZeroU128`](core::num::NonZeroU128). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::u128!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: u128 = 5; /// const B: core::num::NonZeroU128 = nonzero_lit::u128!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroU128 = nonzero_lit::u128!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::u128; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroU128 = nonzero_lit::u128!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::u128; /// let bar = 3; /// let foo = nonzero_lit::u128!(bar); /// ``` #[macro_export] macro_rules! u128 { ($val:expr $(,)?) => {{ const __E: u128 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroU128 = $crate::_private::nz_u128(__E); NZ } }}; } /// Create a literal [`NonZeroI128`](core::num::NonZeroI128). /// /// # Examples /// Basic usage /// ``` /// let x = nonzero_lit::i128!(4); /// assert_eq!(x.get(), 4); /// ``` /// /// Works for consts, and the parameter can be any const expression (not just a /// literal). /// ``` /// const A: i128 = 5; /// const B: core::num::NonZeroI128 = nonzero_lit::i128!(A * 10); /// assert_eq!(B.get(), 50); /// ``` /// /// Misuse is detected at compile time. /// ```compile_fail /// const ZERO: core::num::NonZeroI128 = nonzero_lit::i128!(0); /// ``` /// /// Even if dodgy code tries to `#[allow(...)]` it. /// ```compile_fail /// # use nonzero_lit::i128; /// #[allow(const_err)] /// const ZERO: core::num::NonZeroI128 = nonzero_lit::i128!(0); /// ``` /// /// Note: argument must be a constant expression. /// ```compile_fail /// # use nonzero_lit::i128; /// let bar = 3; /// let foo = nonzero_lit::i128!(bar); /// ``` #[macro_export] macro_rules! i128 { ($val:expr $(,)?) => {{ const __E: i128 = $val; { #[deny(const_err)] const NZ: $crate::_private::NonZeroI128 = $crate::_private::nz_i128(__E); NZ } }}; } // Implementation detail — not part of public API. #[doc(hidden)] pub mod _private { pub use core::num::{ NonZeroI128, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI8, NonZeroIsize, NonZeroU128, NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, }; macro_rules! define_nz_ctor { ($(pub fn $nz_func:ident($n:ident : $int:ident) -> $NonZeroInt:ident;)+) => {$( #[inline] pub const fn $nz_func($n : $int) -> $NonZeroInt { // Note: Hacky const fn assert. let _ = ["N must not be zero"][($n == 0) as usize]; match $NonZeroInt::new($n) { Some(x) => x, // The assert above makes this branch unreachable None => loop {}, } } )+}; } define_nz_ctor! { pub fn nz_usize(n: usize) -> NonZeroUsize; pub fn nz_isize(n: isize) -> NonZeroIsize; pub fn nz_u8(n: u8) -> NonZeroU8; pub fn nz_i8(n: i8) -> NonZeroI8; pub fn nz_u16(n: u16) -> NonZeroU16; pub fn nz_i16(n: i16) -> NonZeroI16; pub fn nz_u32(n: u32) -> NonZeroU32; pub fn nz_i32(n: i32) -> NonZeroI32; pub fn nz_u64(n: u64) -> NonZeroU64; pub fn nz_i64(n: i64) -> NonZeroI64; pub fn nz_u128(n: u128) -> NonZeroU128; pub fn nz_i128(n: i128) -> NonZeroI128; } }