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use ::num_enum::FromPrimitive;
// Guard against https://github.com/illicitonion/num_enum/issues/27
mod alloc {}
mod core {}
mod num_enum {}
mod std {}
macro_rules! has_from_primitive_number {
( $type:ty ) => {
paste::paste! {
#[test]
fn [<has_from_primitive_number_ $type>]() {
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr($type)]
enum Enum {
Zero = 0,
#[num_enum(default)]
NonZero = 1,
}
let zero = Enum::from_primitive(0 as $type);
assert_eq!(zero, Enum::Zero);
let one = Enum::from_primitive(1 as $type);
assert_eq!(one, Enum::NonZero);
let two = Enum::from_primitive(2 as $type);
assert_eq!(two, Enum::NonZero);
}
}
};
}
has_from_primitive_number!(u8);
has_from_primitive_number!(u16);
has_from_primitive_number!(u32);
has_from_primitive_number!(u64);
has_from_primitive_number!(usize);
has_from_primitive_number!(i8);
has_from_primitive_number!(i16);
has_from_primitive_number!(i32);
has_from_primitive_number!(i64);
has_from_primitive_number!(isize);
// repr with 128-bit type is unstable
// has_from_primitive_number!(u128);
// has_from_primitive_number!(i128);
#[test]
fn has_from_primitive_number_standard_default_attribute() {
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Enum {
Zero = 0,
#[default]
NonZero = 1,
}
let zero = Enum::from_primitive(0_u8);
assert_eq!(zero, Enum::Zero);
let one = Enum::from_primitive(1_u8);
assert_eq!(one, Enum::NonZero);
let two = Enum::from_primitive(2_u8);
assert_eq!(two, Enum::NonZero);
}
#[test]
fn from_primitive_number() {
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Enum {
#[num_enum(default)]
Whatever = 0,
}
// #[derive(FromPrimitive)] generates implementations for the following traits:
//
// - `FromPrimitive<T>`
// - `From<T>`
// - `TryFromPrimitive<T>`
// - `TryFrom<T>`
let from_primitive = Enum::from_primitive(0_u8);
assert_eq!(from_primitive, Enum::Whatever);
let from = Enum::from(0_u8);
assert_eq!(from, Enum::Whatever);
let from_primitive = Enum::from_primitive(1_u8);
assert_eq!(from_primitive, Enum::Whatever);
let from = Enum::from(1_u8);
assert_eq!(from, Enum::Whatever);
}
#[test]
fn from_primitive_number_catch_all() {
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Enum {
Zero = 0,
#[num_enum(catch_all)]
NonZero(u8),
}
let zero = Enum::from_primitive(0_u8);
assert_eq!(zero, Enum::Zero);
let one = Enum::from_primitive(1_u8);
assert_eq!(one, Enum::NonZero(1_u8));
let two = Enum::from_primitive(2_u8);
assert_eq!(two, Enum::NonZero(2_u8));
}
#[test]
fn from_primitive_number_catch_all_in_middle() {
#[derive(Debug, PartialEq, Eq, FromPrimitive)]
#[repr(u8)]
enum Enum {
Zero = 0,
#[num_enum(catch_all)]
Else(u8) = 2,
One = 1,
}
let zero = Enum::from_primitive(0_u8);
assert_eq!(zero, Enum::Zero);
let one = Enum::from_primitive(1_u8);
assert_eq!(one, Enum::One);
let two = Enum::from_primitive(2_u8);
assert_eq!(two, Enum::Else(2_u8));
let three = Enum::from_primitive(3_u8);
assert_eq!(three, Enum::Else(3_u8));
}
#[cfg(feature = "complex-expressions")]
#[test]
fn from_primitive_number_with_inclusive_range() {
#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Enum {
Zero = 0,
#[num_enum(alternatives = [2..=255])]
NonZero,
}
let zero = Enum::from_primitive(0_u8);
assert_eq!(zero, Enum::Zero);
let one = Enum::from_primitive(1_u8);
assert_eq!(one, Enum::NonZero);
let two = Enum::from_primitive(2_u8);
assert_eq!(two, Enum::NonZero);
let three = Enum::from_primitive(3_u8);
assert_eq!(three, Enum::NonZero);
let twofivefive = Enum::from_primitive(255_u8);
assert_eq!(twofivefive, Enum::NonZero);
}
|
