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{"files":{"Cargo.toml":"91ca56a63860212f0ad546a431076d9650a190a29a6fe1f42dd9624f44ee05e8","LICENSE-APACHE":"62c7a1e35f56406896d7aa7ca52d0cc0d272ac022b5d2796e7d6905db8a3636a","LICENSE-BSD":"0be96d891d00e0ae0df75d7f3289b12871c000a1f5ac744f3b570768d4bb277c","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"808954bb7af3a919b66c792ccef12e31b98070e78e2a83cde665d0e485cb1a11","src/lib.rs":"92a94fee79ca9c1ae4769246cd88a1f4af28d0b731d416b2643059fed00ef6da"},"package":"dcbff9bc912032c62bf65ef1d5aea88983b420f4f839db1e9b0c281a25c9c799"}

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# 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 = "2018"
name = "num_enum_derive"
version = "0.5.11"
authors = [
"Daniel Wagner-Hall <dawagner@gmail.com>",
"Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>",
"Vincent Esche <regexident@gmail.com>",
]
description = "Internal implementation details for ::num_enum (Procedural macros to make inter-operation between primitives and enums easier)"
readme = "README.md"
keywords = []
categories = []
license = "BSD-3-Clause OR MIT OR Apache-2.0"
repository = "https://github.com/illicitonion/num_enum"
[package.metadata.docs.rs]
features = ["external_doc"]
[lib]
proc-macro = true
[dependencies.proc-macro-crate]
version = "1"
optional = true
[dependencies.proc-macro2]
version = "1"
[dependencies.quote]
version = "1"
[dependencies.syn]
version = "1.0.15"
features = ["parsing"]
[features]
complex-expressions = ["syn/full"]
default = ["std"]
external_doc = []
std = ["proc-macro-crate"]

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Copyright (c) 2018, Daniel Wagner-Hall
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num_enum
========
Procedural macros to make inter-operation between primitives and enums easier.
This crate is no_std compatible.
[![crates.io](https://img.shields.io/crates/v/num_enum.svg)](https://crates.io/crates/num_enum)
[![Documentation](https://docs.rs/num_enum/badge.svg)](https://docs.rs/num_enum)
[![Build Status](https://travis-ci.org/illicitonion/num_enum.svg?branch=master)](https://travis-ci.org/illicitonion/num_enum)
Turning an enum into a primitive
--------------------------------
```rust
use num_enum::IntoPrimitive;
#[derive(IntoPrimitive)]
#[repr(u8)]
enum Number {
Zero,
One,
}
fn main() {
let zero: u8 = Number::Zero.into();
assert_eq!(zero, 0u8);
}
```
`num_enum`'s `IntoPrimitive` is more type-safe than using `as`, because `as` will silently truncate - `num_enum` only derives `From` for exactly the discriminant type of the enum.
Attempting to turn a primitive into an enum with try_from
----------------------------------------------
```rust
use num_enum::TryFromPrimitive;
use std::convert::TryFrom;
#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
enum Number {
Zero,
One,
}
fn main() {
let zero = Number::try_from(0u8);
assert_eq!(zero, Ok(Number::Zero));
let three = Number::try_from(3u8);
assert_eq!(
three.unwrap_err().to_string(),
"No discriminant in enum `Number` matches the value `3`",
);
}
```
Variant alternatives
---------------
Sometimes a single enum variant might be representable by multiple numeric values.
The `#[num_enum(alternatives = [..])]` attribute allows you to define additional value alternatives for individual variants.
(The behavior of `IntoPrimitive` is unaffected by this attribute, it will always return the canonical value.)
```rust
use num_enum::TryFromPrimitive;
use std::convert::TryFrom;
#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
enum Number {
Zero = 0,
#[num_enum(alternatives = [2])]
OneOrTwo = 1,
}
fn main() {
let zero = Number::try_from(0u8);
assert_eq!(zero, Ok(Number::Zero));
let one = Number::try_from(1u8);
assert_eq!(one, Ok(Number::OneOrTwo));
let two = Number::try_from(2u8);
assert_eq!(two, Ok(Number::OneOrTwo));
let three = Number::try_from(3u8);
assert_eq!(
three.unwrap_err().to_string(),
"No discriminant in enum `Number` matches the value `3`",
);
}
```
Range expressions are also supported for alternatives, but this requires enabling the `complex-expressions` feature:
```rust
use num_enum::TryFromPrimitive;
use std::convert::TryFrom;
#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
enum Number {
Zero = 0,
#[num_enum(alternatives = [2..16])]
Some = 1,
#[num_enum(alternatives = [17, 18..=255])]
Many = 16,
}
fn main() {
let zero = Number::try_from(0u8);
assert_eq!(zero, Ok(Number::Zero));
let some = Number::try_from(15u8);
assert_eq!(some, Ok(Number::Some));
let many = Number::try_from(255u8);
assert_eq!(many, Ok(Number::Many));
}
```
Default variant
---------------
Sometimes it is desirable to have an `Other` variant in an enum that acts as a kind of a wildcard matching all the value not yet covered by other variants.
The `#[num_enum(default)]` attribute allows you to mark variant as the default.
(The behavior of `IntoPrimitive` is unaffected by this attribute, it will always return the canonical value.)
```rust
use num_enum::TryFromPrimitive;
use std::convert::TryFrom;
#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
enum Number {
Zero = 0,
#[num_enum(default)]
NonZero = 1,
}
fn main() {
let zero = Number::try_from(0u8);
assert_eq!(zero, Ok(Number::Zero));
let one = Number::try_from(1u8);
assert_eq!(one, Ok(Number::NonZero));
let two = Number::try_from(2u8);
assert_eq!(two, Ok(Number::NonZero));
}
```
Safely turning a primitive into an exhaustive enum with from_primitive
-------------------------------------------------------------
If your enum has all possible primitive values covered, you can derive `FromPrimitive` for it (which auto-implement stdlib's `From`):
You can cover all possible values by:
* Having variants for every possible value
* Having a variant marked `#[num_enum(default)]`
* Having a variant marked `#[num_enum(catch_all)]`
* Having `#[num_enum(alternatives = [...])`s covering values not covered by a variant.
```rust
use num_enum::FromPrimitive;
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Number {
Zero,
#[num_enum(default)]
NonZero,
}
fn main() {
assert_eq!(
Number::Zero,
Number::from(0_u8),
);
assert_eq!(
Number::NonZero,
Number::from(1_u8),
);
}
```
Catch-all variant
-----------------
Sometimes it is desirable to have an `Other` variant which holds the otherwise un-matched value as a field.
The `#[num_enum(catch_all)]` attribute allows you to mark at most one variant for this purpose. The variant it's applied to must be a tuple variant with exactly one field matching the `repr` type.
```rust
use num_enum::FromPrimitive;
use std::convert::TryFrom;
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Number {
Zero = 0,
#[num_enum(catch_all)]
NonZero(u8),
}
fn main() {
let zero = Number::from(0u8);
assert_eq!(zero, Number::Zero);
let one = Number::from(1u8);
assert_eq!(one, Number::NonZero(1_u8));
let two = Number::from(2u8);
assert_eq!(two, Number::NonZero(2_u8));
}
```
As this is naturally exhaustive, this is only supported for `FromPrimitive`, not also `TryFromPrimitive`.
Unsafely turning a primitive into an enum with from_unchecked
-------------------------------------------------------------
If you're really certain a conversion will succeed (and have not made use of `#[num_enum(default)]` or `#[num_enum(alternatives = [..])]`
for any of its variants), and want to avoid a small amount of overhead, you can use unsafe code to do this conversion.
Unless you have data showing that the match statement generated in the `try_from` above is a bottleneck for you,
you should avoid doing this, as the unsafe code has potential to cause serious memory issues in your program.
```rust
use num_enum::UnsafeFromPrimitive;
#[derive(Debug, Eq, PartialEq, UnsafeFromPrimitive)]
#[repr(u8)]
enum Number {
Zero,
One,
}
fn main() {
assert_eq!(
unsafe { Number::from_unchecked(0_u8) },
Number::Zero,
);
assert_eq!(
unsafe { Number::from_unchecked(1_u8) },
Number::One,
);
}
unsafe fn undefined_behavior() {
let _ = Number::from_unchecked(2); // 2 is not a valid discriminant!
}
```
Optional features
-----------------
Some enum values may be composed of complex expressions, for example:
```rust
enum Number {
Zero = (0, 1).0,
One = (0, 1).1,
}
```
To cut down on compile time, these are not supported by default, but if you enable the `complex-expressions`
feature of your dependency on `num_enum`, these should start working.
License
-------
num_enum may be used under your choice of the BSD 3-clause, Apache 2, or MIT license.

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