From 26101aeb8ea28bd180b30fc67cba81baadbba8ee Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 29 Mar 2016 20:39:19 +0200
Subject: Move random index generation into utility class

---
 src/random.cc | 29 +++++++++++++++++++++++++++++
 src/random.h  | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 src/random.cc
 create mode 100644 src/random.h

(limited to 'src')

diff --git a/src/random.cc b/src/random.cc
new file mode 100644
index 0000000..dba3647
--- /dev/null
+++ b/src/random.cc
@@ -0,0 +1,29 @@
+#include "random.h"
+
+namespace utility {
+
+std::size_t Random::Range::get() {
+	return this->distribution_(*(this->generator_));
+}
+
+Random::Range::Range(
+	std::mt19937* const generator,
+	const std::size_t   a,
+	const std::size_t   b
+):
+	generator_(generator),
+	distribution_(a, b) { }
+
+Random::Random():
+	device_{},
+	generator_{device_()} { }
+
+Random::Range Random::makeRange(
+	const std::size_t a,
+	const std::size_t b) {
+	this->generator_.seed(this->device_());
+
+	return Range{&(this->generator_), a, b};
+}
+
+}
diff --git a/src/random.h b/src/random.h
new file mode 100644
index 0000000..386dc21
--- /dev/null
+++ b/src/random.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <random>
+
+namespace utility {
+
+class Random {
+	public:
+		class Range {
+			public:
+				std::size_t get();
+
+			protected:
+				friend class Random;
+
+				Range(std::mt19937* const, const std::size_t, const std::size_t);
+
+			private:
+				std::mt19937* const                        generator_;
+				std::uniform_int_distribution<std::size_t> distribution_;
+		};
+
+		Random();
+
+		Range makeRange(const std::size_t, const std::size_t);
+
+	private:
+		std::random_device device_;
+		std::mt19937       generator_;
+
+};
+
+
+}
-- 
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