From 44818615ad603287c06ce790c69308b8887622c6 Mon Sep 17 00:00:00 2001
From: Rene Milk <rene.milk@uni-muenster.de>
Date: Wed, 15 Aug 2012 15:33:16 +0200
Subject: [PATCH] [common] introduce new random header with convience wrapper
around std::random dists
---
dune/stuff/common/random.hh | 122 ++++++++++++++++++++++++++++++++++++
1 file changed, 122 insertions(+)
create mode 100644 dune/stuff/common/random.hh
diff --git a/dune/stuff/common/random.hh b/dune/stuff/common/random.hh
new file mode 100644
index 000000000..ddc42ad3c
--- /dev/null
+++ b/dune/stuff/common/random.hh
@@ -0,0 +1,122 @@
+#ifndef DUNE_STUFF_RANDOM_HH
+#define DUNE_STUFF_RANDOM_HH
+
+#include <random>
+#include <boost/assign/list_of.hpp>
+
+namespace Dune {
+namespace Stuff {
+namespace Common {
+namespace Math {
+
+template <typename T, bool = std::is_integral<T>::value>
+struct UniformDistributionSelector
+{
+};
+
+template <typename T>
+struct UniformDistributionSelector<T, true>
+{
+ typedef std::uniform_int_distribution<T> type;
+};
+template <typename T>
+struct UniformDistributionSelector<T, false>
+{
+ typedef std::uniform_real_distribution<T> type;
+};
+
+template <class T, class DistributionImp, class EngineImp>
+struct RNG
+{
+ typedef DistributionImp DistributionType;
+ typedef EngineImp EngineType;
+ EngineType generator;
+ DistributionType distribution;
+ RNG(EngineType g, DistributionType d)
+ : generator(g)
+ , distribution(d)
+ {
+ }
+
+ T operator()()
+ {
+ return distribution(generator);
+ }
+};
+
+template <class T>
+class DefaultRNG : public RNG<T, typename UniformDistributionSelector<T>::type, std::default_random_engine>
+{
+ typedef RNG<T, typename UniformDistributionSelector<T>::type, std::default_random_engine> BaseType;
+
+public:
+ DefaultRNG(T min = std::numeric_limits<T>::min(), T max = std::numeric_limits<T>::max())
+ : BaseType(std::default_random_engine(std::random_device()()),
+ typename UniformDistributionSelector<T>::type(min, max))
+ {
+ }
+};
+
+namespace {
+const std::string alphanums("abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "1234567890");
+const std::string other_printables("!@#$%^&*()"
+ "`~-_=+[{]{\\|;:'\",<.>/? ");
+}
+
+class RandomStrings : public RNG<std::string, std::uniform_int_distribution<int>, std::mt19937>
+{
+ typedef RNG<std::string, std::uniform_int_distribution<int>, std::mt19937> BaseType;
+ const int length;
+
+public:
+ RandomStrings(int l)
+ : BaseType(std::mt19937(std::random_device()()), std::uniform_int_distribution<int>(0, alphanums.size() - 1))
+ , length(l)
+ {
+ }
+
+ std::string operator()()
+ {
+ std::string ret(length, '\0');
+ std::generate(std::begin(ret), std::end(ret), [=]() { return alphanums[distribution(generator)]; });
+ return ret;
+ }
+};
+
+
+} // namespace Math
+} // namespace Common
+} // namespace Stuff
+} // namespace Dune
+
+#endif // DUNE_STUFF_RANDOM_HH
+
+/** Copyright (c) 2012, Rene Milk
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those
+ * of the authors and should not be interpreted as representing official policies,
+ * either expressed or implied, of the FreeBSD Project.
+ **/
--
GitLab