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Add is_one.

This commit is contained in:
Clar Charr 2018-02-19 15:05:11 -05:00
parent bfd62d4638
commit 9461cd84f2
1 changed files with 8 additions and 0 deletions
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8
src/identities.rs
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@ -79,6 +79,14 @@ pub trait One: Sized + Mul<Self, Output = Self> {
/// `static mut`s. /// `static mut`s.
// FIXME (#5527): This should be an associated constant // FIXME (#5527): This should be an associated constant
fn one() -> Self; fn one() -> Self;
/// Returns `true` if `self` is equal to the multiplicative identity.
///
/// Compatibility note: this method will be a requirement to implement in the future; new
/// implementors should provide it for future-compatibility.
fn is_one(&self) -> bool where Self: PartialEq {
*self == Self::one()
}
} }
macro_rules! one_impl { macro_rules! one_impl {