diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs index 8db59bd370e76..0f95230034c8b 100644 --- a/src/libcore/cmp.rs +++ b/src/libcore/cmp.rs @@ -39,7 +39,7 @@ #![stable] -use option::{Option, Some}; +use option::{None, Option, Some}; /// Trait for values that can be compared for equality and inequality. /// @@ -122,6 +122,30 @@ pub trait Ord: Eq + PartialOrd { /// assert_eq!( 5u.cmp(&5), Equal); // because 5 == 5 /// ``` fn cmp(&self, other: &Self) -> Ordering; + + /// This method returns the greater of two values. + /// + /// If the values are equal, the value which this method was called on + /// (self) is returned. + #[inline] + fn max<'a>(&'a self, other: &'a Self) -> &'a Self { + match self.cmp(other) { + Less => other, + _ => self, + } + } + + /// This method returns the lesser of two values. + /// + /// If the values are equal, the value which this method was called on + /// (self) is returned. + #[inline] + fn min<'a>(&'a self, other: &'a Self) -> &'a Self { + match self.cmp(other) { + Greater => other, + _ => self, + } + } } #[unstable = "Trait is unstable."] @@ -207,6 +231,32 @@ pub trait PartialOrd: PartialEq { _ => false, } } + + /// This method returns the greater of two values, if they can be compared. + /// + /// If the values are equal, the value which this method was called on + /// (self) is returned. + #[inline] + fn partial_max<'a>(&'a self, other: &'a Self) -> Option<&'a Self> { + match self.partial_cmp(other) { + Some(Less) => Some(other), + Some(_) => Some(self), + _ => None, + } + } + + /// This method returns the lesser of two values, if they can be compared. + /// + /// If the values are equal, the value which this method was called on + /// (self) is returned. + #[inline] + fn partial_min<'a>(&'a self, other: &'a Self) -> Option<&'a Self> { + match self.partial_cmp(other) { + Some(Greater) => Some(other), + Some(_) => Some(self), + _ => None, + } + } } /// The equivalence relation. Two values may be equivalent even if they are