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Add number method to every bitflag

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This commit is contained in:
Corey Richardson 2015-07-21 12:04:26 -04:00
parent f3918d09a8
commit 341be8cbfb
1 changed files with 25 additions and 19 deletions
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44
src/lib.rs
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@ -138,23 +138,6 @@ bitflags! {
}
}
impl Types {
/// Given a bitflag with only a single flag set, returns the event code corresponding to that
/// event. If multiple flags are set, the one with the most significant bit wins. In debug
/// mode,
#[inline(always)]
pub fn number<T: num::FromPrimitive>(&self) -> T {
let val = ffs::<u32>(self.bits());
if cfg!(debug_assertions) {
if self.bits() != 1 << val {
panic!("{:?} ought to have only one flag set to be used with .number()", self);
}
}
T::from_u32(val).unwrap()
}
}
bitflags! {
/// Device properties.
flags Props: u32 {
@ -375,6 +358,29 @@ bitflags! {
}
}
macro_rules! impl_number {
($($t:ident),*) => {
$(impl $t {
/// Given a bitflag with only a single flag set, returns the event code corresponding to that
/// event. If multiple flags are set, the one with the most significant bit wins. In debug
/// mode,
#[inline(always)]
pub fn number<T: num::FromPrimitive>(&self) -> T {
if cfg!(debug_assertions) {
let val = ffs(self.bits());
self.bits() == val; // hack to induce the constraint typeof(self.bits()) = typeof(val)
if self.bits() != 1 << val {
panic!("{:?} ought to have only one flag set to be used with .number()", self);
}
}
T::from_u32(ffs(self.bits())).unwrap()
}
})*
}
}
impl_number!(Types, Props, RelativeAxis, AbsoluteAxis, Switch, Led, Misc, FFStatus, Repeat, Sound);
#[repr(C)]
#[derive(Copy, Clone, Debug)]
pub enum Synchronization {
@ -619,8 +625,8 @@ impl Drop for Device {
}
}
fn ffs<T: num::FromPrimitive>(x: u32) -> T {
T::from_u32(31 - x.leading_zeros()).unwrap()
fn ffs<T: num::FromPrimitive, U: num::ToPrimitive>(x: U) -> T {
T::from_u32(31 - U::to_u64(&x).unwrap().leading_zeros()).unwrap()
}
impl Device {