1 files changed, 33 insertions, 0 deletions
diff --git a/Swiften/Base/StdRandomGenerator.cpp b/Swiften/Base/StdRandomGenerator.cpp
new file mode 100644
index 0000000..8b1dee0
--- /dev/null
+++ b/Swiften/Base/StdRandomGenerator.cpp
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2012-2017 Isode Limited.
+ * All rights reserved.
+ * See the COPYING file for more information.
+ */
+
+#include <Swiften/Base/StdRandomGenerator.h>
+
+#include <algorithm>
+#include <functional>
+
+namespace {
+    template<class T = std::mt19937, std::size_t N = T::state_size>
+    typename std::enable_if<!!N, T>::type createSeededRandomEngine() {
+        typename T::result_type random_data[N];
+        std::random_device source;
+        std::generate(std::begin(random_data), std::end(random_data), std::ref(source));
+        std::seed_seq seeds(std::begin(random_data), std::end(random_data));
+        return T(seeds);
+    }
+}
+
+namespace Swift {
+
+StdRandomGenerator::StdRandomGenerator() : generator(createSeededRandomEngine()) {
+}
+
+int StdRandomGenerator::generateRandomInteger(int maximum) {
+    std::uniform_int_distribution<> distribution(0, maximum);
+    return distribution(generator);
+}
+
+}