Auto merge of #43710 - zackmdavis:field_init_shorthand_power_slam, r=Mark-Simulacrum

[rust.git] / src / librand / distributions / mod.rs

diff --git a/src/librand/distributions/mod.rs b/src/librand/distributions/mod.rs
index 41175c81df8918bbd5302e8f816296ab150a01f9..47967a719d397a8972d39bf4e90ac356721af550 100644 (file)
--- a/src/librand/distributions/mod.rs
+++ b/src/librand/distributions/mod.rs
@@ -17,6 +17,8 @@
 //! internally. The `IndependentSample` trait is for generating values
 //! that do not need to record state.
 
+use core::fmt;
+
 #[cfg(not(test))] // only necessary for no_std
 use core::num::Float;
 
@@ -51,7 +53,7 @@ pub trait Sample<Support> {
 // trait called `Sample` and the other should be `DependentSample`.
 pub trait IndependentSample<Support>: Sample<Support> {
     /// Generate a random value.
-    fn ind_sample<R: Rng>(&self, &mut R) -> Support;
+    fn ind_sample<R: Rng>(&self, _: &mut R) -> Support;
 }
 
 /// A wrapper for generating types that implement `Rand` via the
@@ -78,6 +80,12 @@ fn ind_sample<R: Rng>(&self, rng: &mut R) -> Sup {
     }
 }
 
+impl<Sup> fmt::Debug for RandSample<Sup> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("RandSample { .. }")
+    }
+}
+
 /// A value with a particular weight for use with `WeightedChoice`.
 pub struct Weighted<T> {
     /// The numerical weight of this item
@@ -86,6 +94,15 @@ pub struct Weighted<T> {
     pub item: T,
 }
 
+impl<T: fmt::Debug> fmt::Debug for Weighted<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Weighted")
+         .field("weight", &self.weight)
+         .field("item", &self.item)
+         .finish()
+    }
+}
+
 /// A distribution that selects from a finite collection of weighted items.
 ///
 /// Each item has an associated weight that influences how likely it
@@ -132,7 +149,7 @@ pub fn new(items: &'a mut [Weighted<T>]) -> WeightedChoice<'a, T> {
                 "WeightedChoice::new called with a total weight of 0");
 
         WeightedChoice {
-            items: items,
+            items,
             // we're likely to be generating numbers in this range
             // relatively often, so might as well cache it
             weight_range: Range::new(0, running_total),
@@ -189,6 +206,15 @@ fn ind_sample<R: Rng>(&self, rng: &mut R) -> T {
     }
 }
 
+impl<'a, T: fmt::Debug> fmt::Debug for WeightedChoice<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("WeightedChoice")
+         .field("items", &self.items)
+         .field("weight_range", &self.weight_range)
+         .finish()
+    }
+}
+
 mod ziggurat_tables;
 
 /// Sample a random number using the Ziggurat method (specifically the