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-rw-r--r--Swiften/Base/BoostRandomGenerator.cpp27
-rw-r--r--Swiften/Base/BoostRandomGenerator.h21
-rw-r--r--Swiften/Base/RandomGenerator.cpp15
-rw-r--r--Swiften/Base/RandomGenerator.h18
-rw-r--r--Swiften/Base/SConscript2
5 files changed, 83 insertions, 0 deletions
diff --git a/Swiften/Base/BoostRandomGenerator.cpp b/Swiften/Base/BoostRandomGenerator.cpp
new file mode 100644
index 0000000..b8c50d0
--- /dev/null
+++ b/Swiften/Base/BoostRandomGenerator.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2012 Remko Tronçon
+ * Licensed under the GNU General Public License v3.
+ * See Documentation/Licenses/GPLv3.txt for more information.
+ */
+
+#include <Swiften/Base/BoostRandomGenerator.h>
+
+#include <numeric>
+#include <boost/random/uniform_real.hpp>
+#include <boost/random/variate_generator.hpp>
+
+namespace Swift {
+
+int BoostRandomGenerator::generateWeighedRandomNumber(std::vector<double>::const_iterator probabilities_begin, std::vector<double>::const_iterator probabilities_end) {
+ // Only works starting boost 1.47
+ //boost::random::discrete_distribution<> distribution(weights.begin(), weights.end());
+ //return distribution(generator);
+
+ std::vector<double> cumulative;
+ std::partial_sum(probabilities_begin, probabilities_end, std::back_inserter(cumulative));
+ boost::uniform_real<> dist(0, cumulative.back());
+ boost::variate_generator<boost::mt19937&, boost::uniform_real<> > die(generator, dist);
+ return std::lower_bound(cumulative.begin(), cumulative.end(), die()) - cumulative.begin();
+}
+
+}
diff --git a/Swiften/Base/BoostRandomGenerator.h b/Swiften/Base/BoostRandomGenerator.h
new file mode 100644
index 0000000..ffc7a72
--- /dev/null
+++ b/Swiften/Base/BoostRandomGenerator.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2012 Remko Tronçon
+ * Licensed under the GNU General Public License v3.
+ * See Documentation/Licenses/GPLv3.txt for more information.
+ */
+
+#pragma once
+
+#include <Swiften/Base/RandomGenerator.h>
+
+#include <boost/random/mersenne_twister.hpp>
+
+namespace Swift {
+ class BoostRandomGenerator : public RandomGenerator{
+ public:
+ int generateWeighedRandomNumber(std::vector<double>::const_iterator probabilities_begin, std::vector<double>::const_iterator probabilities_end);
+
+ private:
+ boost::mt19937 generator;
+ };
+}
diff --git a/Swiften/Base/RandomGenerator.cpp b/Swiften/Base/RandomGenerator.cpp
new file mode 100644
index 0000000..f2dcca3
--- /dev/null
+++ b/Swiften/Base/RandomGenerator.cpp
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2012 Remko Tronçon
+ * Licensed under the GNU General Public License v3.
+ * See Documentation/Licenses/GPLv3.txt for more information.
+ */
+
+#include <Swiften/Base/RandomGenerator.h>
+
+namespace Swift {
+
+RandomGenerator::~RandomGenerator() {
+
+}
+
+}
diff --git a/Swiften/Base/RandomGenerator.h b/Swiften/Base/RandomGenerator.h
new file mode 100644
index 0000000..a998e0d
--- /dev/null
+++ b/Swiften/Base/RandomGenerator.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2012 Remko Tronçon
+ * Licensed under the GNU General Public License v3.
+ * See Documentation/Licenses/GPLv3.txt for more information.
+ */
+
+#pragma once
+
+#include <vector>
+
+namespace Swift {
+ class RandomGenerator {
+ public:
+ virtual ~RandomGenerator();
+
+ virtual int generateWeighedRandomNumber(std::vector<double>::const_iterator probabilities_begin, std::vector<double>::const_iterator probabilities_end) = 0;
+ };
+}
diff --git a/Swiften/Base/SConscript b/Swiften/Base/SConscript
index 1f07483..a5f3592 100644
--- a/Swiften/Base/SConscript
+++ b/Swiften/Base/SConscript
@@ -10,6 +10,8 @@ objects = swiften_env.SwiftenObject([
"String.cpp",
"IDGenerator.cpp",
"SimpleIDGenerator.cpp",
+ "RandomGenerator.cpp",
+ "BoostRandomGenerator.cpp",
"sleep.cpp",
])
swiften_env.Append(SWIFTEN_OBJECTS = [objects])