Add ConstantDistribution.

rust-random · Mar 23, 2015 · c73ab02 · c73ab02
1 parent 6e30259
commit c73ab02
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/distributions/mod.rs b/src/distributions/mod.rs
@@ -63,6 +63,17 @@ impl<T> RandDistribution<T> {
     }
 }
 
+pub struct ConstantDistribution<T>(pub T);
+
+impl<T: Clone> Distribution for ConstantDistribution<T> {
+    type Output = T;
+
+    fn sample<R: Rng>(&self, _: &mut R) -> T {
+        let ConstantDistribution(ref value) = *self;
+        value.clone()
+    }
+}
+
 /// A value with a particular weight for use with `WeightedChoice`.
 pub struct Weighted<T> {
     /// The numerical weight of this item