chore: checkpoint before Python removal

vendor/enum-ordinalize/.cargo-checksum.json

@@ -0,0 +1 @@
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vendor/enum-ordinalize/.cargo_vcs_info.json

@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "4ce3f4e082629cd859d9cedb7210ecbadbc7b511"
+  },
+  "path_in_vcs": "enum-ordinalize"
+}

vendor/enum-ordinalize/Cargo.lock

@@ -0,0 +1,56 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "enum-ordinalize"
+version = "4.3.2"
+dependencies = [
+ "enum-ordinalize-derive",
+]
+
+[[package]]
+name = "enum-ordinalize-derive"
+version = "4.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ca9601fb2d62598ee17836250842873a413586e5d7ed88b356e38ddbb0ec631"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "proc-macro2"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "unicode-ident",
+]
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+dependencies = [
+ "proc-macro2",
+]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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vendor/enum-ordinalize/Cargo.toml

@@ -0,0 +1,68 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.68"
+name = "enum-ordinalize"
+version = "4.3.2"
+build = false
+include = [
+    "src/**/*",
+    "Cargo.toml",
+    "README.md",
+    "LICENSE",
+]
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = "This library enables enums to not only obtain the ordinal values of their variants but also allows for the construction of enums from an ordinal value."
+homepage = "https://magiclen.org/enum-ordinalize"
+readme = "README.md"
+keywords = [
+    "enum",
+    "ordinal",
+    "ordinalize",
+    "number",
+]
+categories = [
+    "no-std",
+    "rust-patterns",
+]
+license = "MIT"
+repository = "https://github.com/magiclen/enum-ordinalize"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[features]
+default = [
+    "derive",
+    "traits",
+]
+derive = ["dep:enum-ordinalize-derive"]
+nightly-test = []
+traits = ["enum-ordinalize-derive?/traits"]
+
+[lib]
+name = "enum_ordinalize"
+path = "src/lib.rs"
+
+[dependencies.enum-ordinalize-derive]
+version = "4.3"
+optional = true
+default-features = false

vendor/enum-ordinalize/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 magiclen.org (Ron Li)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/enum-ordinalize/README.md

@@ -0,0 +1,190 @@
+Enum Ordinalize
+====================
+
+[![CI](https://github.com/magiclen/enum-ordinalize/actions/workflows/ci.yml/badge.svg)](https://github.com/magiclen/enum-ordinalize/actions/workflows/ci.yml)
+
+This library enables enums to not only obtain the ordinal values of their variants but also allows for the construction of enums from an ordinal value.
+
+## Usage
+
+Use `#[derive(Ordinalize)]` to have an enum (which must only has unit variants) implement the `Ordinalize` trait.
+
+```rust
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+}
+
+assert_eq!(3, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two], MyEnum::VARIANTS);
+assert_eq!([0i8, 1i8, 2i8], MyEnum::VALUES);
+
+assert_eq!(0i8, MyEnum::Zero.ordinal());
+assert_eq!(1i8, MyEnum::One.ordinal());
+assert_eq!(2i8, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0i8));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1i8));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2i8));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0i8) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1i8) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2i8) });
+```
+
+#### The (Ordinal) Size of an Enum
+
+The ordinal value is an integer whose size is determined by the enum itself. The size of the enum increases with the magnitude of the variants' values, whether larger (or smaller if negative).
+
+For example,
+
+```rust
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+    Thousand = 1000,
+}
+
+assert_eq!(4, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two, MyEnum::Thousand], MyEnum::VARIANTS);
+assert_eq!([0i16, 1i16, 2i16, 1000i16], MyEnum::VALUES);
+
+assert_eq!(0i16, MyEnum::Zero.ordinal());
+assert_eq!(1i16, MyEnum::One.ordinal());
+assert_eq!(2i16, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0i16));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1i16));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2i16));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0i16) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1i16) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2i16) });
+```
+
+In order to accommodate the value `1000`, the size of `MyEnum` increases. Consequently, the ordinal is represented in `i16` instead of `i8`.
+
+You can utilize the `#[repr(type)]` attribute to explicitly control the size. For instance,
+
+```rust
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+#[repr(usize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+    Thousand = 1000,
+}
+
+assert_eq!(4, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two, MyEnum::Thousand], MyEnum::VARIANTS);
+assert_eq!([0usize, 1usize, 2usize, 1000usize], MyEnum::VALUES);
+
+assert_eq!(0usize, MyEnum::Zero.ordinal());
+assert_eq!(1usize, MyEnum::One.ordinal());
+assert_eq!(2usize, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0usize));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1usize));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2usize));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0usize) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1usize) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2usize) });
+```
+
+#### Useful Increment
+
+The integers represented by variants can be extended in successive increments and set explicitly from any value.
+
+```rust
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Two   = 2,
+    Three,
+    Four,
+    Eight = 8,
+    Nine,
+    NegativeTen = -10,
+    NegativeNine,
+}
+
+assert_eq!(7, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Two, MyEnum::Three, MyEnum::Four, MyEnum::Eight, MyEnum::Nine, MyEnum::NegativeTen, MyEnum::NegativeNine], MyEnum::VARIANTS);
+assert_eq!([2i8, 3i8, 4i8, 8i8, 9i8, -10i8, -9i8], MyEnum::VALUES);
+
+assert_eq!(4i8, MyEnum::Four.ordinal());
+assert_eq!(9i8, MyEnum::Nine.ordinal());
+assert_eq!(-9i8, MyEnum::NegativeNine.ordinal());
+
+assert_eq!(Some(MyEnum::Four), MyEnum::from_ordinal(4i8));
+assert_eq!(Some(MyEnum::Nine), MyEnum::from_ordinal(9i8));
+assert_eq!(Some(MyEnum::NegativeNine), MyEnum::from_ordinal(-9i8));
+
+assert_eq!(MyEnum::Four, unsafe { MyEnum::from_ordinal_unsafe(4i8) });
+assert_eq!(MyEnum::Nine, unsafe { MyEnum::from_ordinal_unsafe(9i8) });
+assert_eq!(MyEnum::NegativeNine, unsafe { MyEnum::from_ordinal_unsafe(-9i8) });
+```
+
+#### Implement Functionality for an enum on Itself
+
+For some reason, if you don't want to implement the `Ordinalize` trait for your enum, you can choose to disable the trait implementation and enable the constants/functions one by one. Functions are `const fn`. Names and visibility can also be defined by you.
+
+```rust
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+#[ordinalize(impl_trait = false)]
+#[ordinalize(variant_count(pub const VARIANT_COUNT, doc = "The count of variants."))]
+#[ordinalize(variants(pub const VARIANTS, doc = "List of this enum's variants."))]
+#[ordinalize(values(pub const VALUES, doc = "List of values for all variants of this enum."))]
+#[ordinalize(ordinal(pub const fn ordinal, doc = "Retrieve the integer number of this variant."))]
+#[ordinalize(from_ordinal(pub const fn from_ordinal, doc = "Obtain a variant based on an integer number."))]
+#[ordinalize(from_ordinal_unsafe(
+    pub const fn from_ordinal_unsafe,
+    doc = "Obtain a variant based on an integer number.",
+    doc = "# Safety",
+    doc = "You have to ensure that the input integer number can correspond to a variant on your own.",
+))]
+enum MyEnum {
+    A,
+    B,
+}
+
+assert_eq!(2, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::A, MyEnum::B], MyEnum::VARIANTS);
+assert_eq!([0i8, 1i8], MyEnum::VALUES);
+
+assert_eq!(0i8, MyEnum::A.ordinal());
+assert_eq!(1i8, MyEnum::B.ordinal());
+
+assert_eq!(Some(MyEnum::A), MyEnum::from_ordinal(0i8));
+assert_eq!(Some(MyEnum::B), MyEnum::from_ordinal(1i8));
+
+assert_eq!(MyEnum::A, unsafe { MyEnum::from_ordinal_unsafe(0i8) });
+assert_eq!(MyEnum::B, unsafe { MyEnum::from_ordinal_unsafe(1i8) });
+```
+
+## Crates.io
+
+https://crates.io/crates/enum-ordinalize
+
+## Documentation
+
+https://docs.rs/enum-ordinalize
+
+## License
+
+[MIT](LICENSE)

vendor/enum-ordinalize/src/lib.rs

@@ -0,0 +1,203 @@
+/*!
+# Enum Ordinalize
+
+This library enables enums to not only obtain the ordinal values of their variants but also allows for the construction of enums from an ordinal value.
+
+## Usage
+
+Use `#[derive(Ordinalize)]` to have an enum (which must only has unit variants) implement the `Ordinalize` trait.
+
+```rust
+# #[cfg(all(feature = "derive", feature = "traits"))]
+# {
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+}
+
+assert_eq!(3, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two], MyEnum::VARIANTS);
+assert_eq!([0i8, 1i8, 2i8], MyEnum::VALUES);
+
+assert_eq!(0i8, MyEnum::Zero.ordinal());
+assert_eq!(1i8, MyEnum::One.ordinal());
+assert_eq!(2i8, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0i8));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1i8));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2i8));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0i8) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1i8) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2i8) });
+# }
+```
+
+#### The (Ordinal) Size of an Enum
+
+The ordinal value is an integer whose size is determined by the enum itself. The size of the enum increases with the magnitude of the variants' values, whether larger (or smaller if negative).
+
+For example,
+
+```rust
+# #[cfg(all(feature = "derive", feature = "traits"))]
+# {
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+    Thousand = 1000,
+}
+
+assert_eq!(4, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two, MyEnum::Thousand], MyEnum::VARIANTS);
+assert_eq!([0i16, 1i16, 2i16, 1000i16], MyEnum::VALUES);
+
+assert_eq!(0i16, MyEnum::Zero.ordinal());
+assert_eq!(1i16, MyEnum::One.ordinal());
+assert_eq!(2i16, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0i16));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1i16));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2i16));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0i16) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1i16) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2i16) });
+# }
+```
+
+In order to accommodate the value `1000`, the size of `MyEnum` increases. Consequently, the ordinal is represented in `i16` instead of `i8`.
+
+You can utilize the `#[repr(type)]` attribute to explicitly control the size. For instance,
+
+```rust
+# #[cfg(all(feature = "derive", feature = "traits"))]
+# {
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+#[repr(usize)]
+enum MyEnum {
+    Zero,
+    One,
+    Two,
+    Thousand = 1000,
+}
+
+assert_eq!(4, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Zero, MyEnum::One, MyEnum::Two, MyEnum::Thousand], MyEnum::VARIANTS);
+assert_eq!([0usize, 1usize, 2usize, 1000usize], MyEnum::VALUES);
+
+assert_eq!(0usize, MyEnum::Zero.ordinal());
+assert_eq!(1usize, MyEnum::One.ordinal());
+assert_eq!(2usize, MyEnum::Two.ordinal());
+
+assert_eq!(Some(MyEnum::Zero), MyEnum::from_ordinal(0usize));
+assert_eq!(Some(MyEnum::One), MyEnum::from_ordinal(1usize));
+assert_eq!(Some(MyEnum::Two), MyEnum::from_ordinal(2usize));
+
+assert_eq!(MyEnum::Zero, unsafe { MyEnum::from_ordinal_unsafe(0usize) });
+assert_eq!(MyEnum::One, unsafe { MyEnum::from_ordinal_unsafe(1usize) });
+assert_eq!(MyEnum::Two, unsafe { MyEnum::from_ordinal_unsafe(2usize) });
+# }
+```
+
+#### Useful Increment
+
+The integers represented by variants can be extended in successive increments and set explicitly from any value.
+
+```rust
+# #[cfg(all(feature = "derive", feature = "traits"))]
+# {
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+enum MyEnum {
+    Two   = 2,
+    Three,
+    Four,
+    Eight = 8,
+    Nine,
+    NegativeTen = -10,
+    NegativeNine,
+}
+
+assert_eq!(7, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::Two, MyEnum::Three, MyEnum::Four, MyEnum::Eight, MyEnum::Nine, MyEnum::NegativeTen, MyEnum::NegativeNine], MyEnum::VARIANTS);
+assert_eq!([2i8, 3i8, 4i8, 8i8, 9i8, -10i8, -9i8], MyEnum::VALUES);
+
+assert_eq!(4i8, MyEnum::Four.ordinal());
+assert_eq!(9i8, MyEnum::Nine.ordinal());
+assert_eq!(-9i8, MyEnum::NegativeNine.ordinal());
+
+assert_eq!(Some(MyEnum::Four), MyEnum::from_ordinal(4i8));
+assert_eq!(Some(MyEnum::Nine), MyEnum::from_ordinal(9i8));
+assert_eq!(Some(MyEnum::NegativeNine), MyEnum::from_ordinal(-9i8));
+
+assert_eq!(MyEnum::Four, unsafe { MyEnum::from_ordinal_unsafe(4i8) });
+assert_eq!(MyEnum::Nine, unsafe { MyEnum::from_ordinal_unsafe(9i8) });
+assert_eq!(MyEnum::NegativeNine, unsafe { MyEnum::from_ordinal_unsafe(-9i8) });
+# }
+```
+
+#### Implement Functionality for an enum on Itself
+
+For some reason, if you don't want to implement the `Ordinalize` trait for your enum, you can choose to disable the trait implementation and enable the constants/functions one by one. Functions are `const fn`. Names and visibility can also be defined by you.
+
+```rust
+# #[cfg(feature = "derive")]
+# {
+use enum_ordinalize::Ordinalize;
+
+#[derive(Debug, PartialEq, Eq, Ordinalize)]
+#[ordinalize(impl_trait = false)]
+#[ordinalize(variant_count(pub const VARIANT_COUNT, doc = "The count of variants."))]
+#[ordinalize(variants(pub const VARIANTS, doc = "List of this enum's variants."))]
+#[ordinalize(values(pub const VALUES, doc = "List of values for all variants of this enum."))]
+#[ordinalize(ordinal(pub const fn ordinal, doc = "Retrieve the integer number of this variant."))]
+#[ordinalize(from_ordinal(pub const fn from_ordinal, doc = "Obtain a variant based on an integer number."))]
+#[ordinalize(from_ordinal_unsafe(
+    pub const fn from_ordinal_unsafe,
+    doc = "Obtain a variant based on an integer number.",
+    doc = "# Safety",
+    doc = "You have to ensure that the input integer number can correspond to a variant on your own.",
+))]
+enum MyEnum {
+    A,
+    B,
+}
+
+assert_eq!(2, MyEnum::VARIANT_COUNT);
+assert_eq!([MyEnum::A, MyEnum::B], MyEnum::VARIANTS);
+assert_eq!([0i8, 1i8], MyEnum::VALUES);
+
+assert_eq!(0i8, MyEnum::A.ordinal());
+assert_eq!(1i8, MyEnum::B.ordinal());
+
+assert_eq!(Some(MyEnum::A), MyEnum::from_ordinal(0i8));
+assert_eq!(Some(MyEnum::B), MyEnum::from_ordinal(1i8));
+
+assert_eq!(MyEnum::A, unsafe { MyEnum::from_ordinal_unsafe(0i8) });
+assert_eq!(MyEnum::B, unsafe { MyEnum::from_ordinal_unsafe(1i8) });
+# }
+```
+*/
+
+#![no_std]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
+#[cfg(feature = "traits")]
+mod traits;
+
+#[cfg(feature = "derive")]
+pub use enum_ordinalize_derive::Ordinalize;
+#[cfg(feature = "traits")]
+pub use traits::Ordinalize;

vendor/enum-ordinalize/src/traits.rs

@@ -0,0 +1,68 @@
+/// This trait provides an enum with the ability to not only obtain the ordinal values of its variants but also allows for the construction of enums from an ordinal value.
+///
+/// ```rust
+/// use enum_ordinalize::Ordinalize;
+///
+/// #[repr(u8)]
+/// enum E {
+///     A,
+///     B,
+/// }
+///
+/// impl Ordinalize for E {
+///     type VariantType = u8;
+///
+///     const VALUES: &'static [Self::VariantType] = &[0, 1];
+///     const VARIANTS: &'static [Self] = &[E::A, E::B];
+///     const VARIANT_COUNT: usize = 2;
+///
+///     #[inline]
+///     unsafe fn from_ordinal_unsafe(number: Self::VariantType) -> Self {
+///         ::core::mem::transmute(number)
+///     }
+///
+///     #[inline]
+///     fn from_ordinal(number: Self::VariantType) -> Option<Self> {
+///         match number {
+///             0 => Some(Self::A),
+///             1 => Some(Self::B),
+///             _ => None,
+///         }
+///     }
+///
+///     #[inline]
+///     fn ordinal(&self) -> Self::VariantType {
+///         match self {
+///             Self::A => 0,
+///             Self::B => 1,
+///         }
+///     }
+/// }
+/// ```
+pub trait Ordinalize: Sized + 'static {
+    /// The type of the values of the variants.
+    type VariantType;
+
+    /// The count of variants.
+    const VARIANT_COUNT: usize;
+
+    /// List of this enum's variants.
+    const VARIANTS: &'static [Self];
+
+    /// List of values for all variants of this enum.
+    const VALUES: &'static [Self::VariantType];
+
+    /// Obtain a variant based on an integer number.
+    ///
+    /// # Safety
+    /// You have to ensure that the input integer number can correspond to a variant on your own.
+    unsafe fn from_ordinal_unsafe(number: Self::VariantType) -> Self;
+
+    /// Obtain a variant based on an integer number.
+    fn from_ordinal(number: Self::VariantType) -> Option<Self>
+    where
+        Self: Sized;
+
+    /// Retrieve the integer number of this variant.
+    fn ordinal(&self) -> Self::VariantType;
+}