From: Alexis Laferrière <alexis.laf@xymus.net>
Date: Wed, 4 Mar 2015 02:00:35 +0000 (-0500)
Subject: lib: add an optimized `SequenceRead[E].rand`
X-Git-Tag: v0.7.3~32^2~4
X-Git-Url: http://nitlanguage.org?hp=27be7768f904c3a2d953bab2a1ce040de877b34b

lib: add an optimized `SequenceRead[E].rand`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
---

diff --git a/lib/standard/math.nit b/lib/standard/math.nit
index 4b6ed35..14c0e40 100644
--- a/lib/standard/math.nit
+++ b/lib/standard/math.nit
@@ -238,6 +238,15 @@ redef class Collection[ E ]
 	end
 end
 
+redef class SequenceRead[E]
+	# Optimized for large collections using `[]`
+	redef fun rand
+	do
+		assert not is_empty
+		return self[length.rand]
+	end
+end
+
 redef class Sys
 	init
 	do