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|
use super::*;
use crate::Flags;
#[test]
fn cases() {
case(
TestFlags::A | TestFlags::B,
&[
(TestFlags::A, 1 << 1),
(TestFlags::B, 1),
(TestFlags::from_bits_retain(1 << 3), 1 | 1 << 1),
],
TestFlags::difference,
);
case(
TestFlags::from_bits_retain(1 | 1 << 3),
&[
(TestFlags::A, 1 << 3),
(TestFlags::from_bits_retain(1 << 3), 1),
],
TestFlags::difference,
);
case(
TestExternal::from_bits_retain(!0),
&[(TestExternal::A, 0b1111_1110)],
TestExternal::difference,
);
assert_eq!(
0b1111_1110,
(TestExternal::from_bits_retain(!0) & !TestExternal::A).bits()
);
assert_eq!(
0b1111_1110,
(TestFlags::from_bits_retain(!0).difference(TestFlags::A)).bits()
);
// The `!` operator unsets bits that don't correspond to known flags
assert_eq!(
1 << 1 | 1 << 2,
(TestFlags::from_bits_retain(!0) & !TestFlags::A).bits()
);
}
#[track_caller]
fn case<T: Flags + std::fmt::Debug + std::ops::Sub<Output = T> + std::ops::SubAssign + Copy>(
value: T,
inputs: &[(T, T::Bits)],
mut inherent: impl FnMut(T, T) -> T,
) where
T::Bits: std::fmt::Debug + PartialEq + Copy,
{
for (input, expected) in inputs {
assert_eq!(
*expected,
inherent(value, *input).bits(),
"{:?}.difference({:?})",
value,
input
);
assert_eq!(
*expected,
Flags::difference(value, *input).bits(),
"Flags::difference({:?}, {:?})",
value,
input
);
assert_eq!(
*expected,
(value - *input).bits(),
"{:?} - {:?}",
value,
input
);
assert_eq!(
*expected,
{
let mut value = value;
value -= *input;
value
}
.bits(),
"{:?} -= {:?}",
value,
input,
);
}
}
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