From 8d7bb5cb59b1d2a01a74fcb334a38bc8eb745563 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Alexis=20Laferri=C3=A8re?= <alexis.laf@xymus.net>
Date: Tue, 3 Mar 2015 21:00:35 -0500
Subject: [PATCH] lib: add an optimized `SequenceRead[E].rand`
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Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
---
 lib/standard/math.nit |    9 +++++++++
 1 file changed, 9 insertions(+)

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
-- 
1.7.9.5