move boost rng wrapper from sc to comphelper

so we can re-use it in other modules

Change-Id: I6057b1e955f745019fd48f91a754279df0f2b948
Reviewed-on: https://gerrit.libreoffice.org/9348
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>

3 files changed, 57 insertions, 1 deletions

diff --git a/comphelper/Library_comphelper.mk b/comphelper/Library_comphelper.mk
index 623bac6856c7..cfe48f631992 100644
--- a/comphelper/Library_comphelper.mk
+++ b/comphelper/Library_comphelper.mk
@@ -99,6 +99,7 @@ $(eval $(call gb_Library_add_exception_objects,comphelper,\
     comphelper/source/misc/officeresourcebundle \
     comphelper/source/misc/officerestartmanager \
     comphelper/source/misc/proxyaggregation \
+    comphelper/source/misc/random \
     comphelper/source/misc/scopeguard \
     comphelper/source/misc/SelectionMultiplex \
     comphelper/source/misc/sequenceashashmap \
diff --git a/comphelper/inc/pch/precompiled_comphelper.hxx b/comphelper/inc/pch/precompiled_comphelper.hxx
index ab660b17a755..36ec107aefb0 100644
--- a/comphelper/inc/pch/precompiled_comphelper.hxx
+++ b/comphelper/inc/pch/precompiled_comphelper.hxx
@@ -18,6 +18,7 @@
 #include <boost/bind.hpp>
 #include <boost/current_function.hpp>
 #include <boost/noncopyable.hpp>
+#include <boost/random.hpp>
 #include <boost/scoped_array.hpp>
 #include <boost/scoped_ptr.hpp>
 #include <boost/shared_ptr.hpp>
@@ -62,7 +63,6 @@
 #include <com/sun/star/container/XNameAccess.hpp>
 #include <com/sun/star/container/XNameContainer.hpp>
 #include <com/sun/star/datatransfer/XTransferable.hpp>
-#include <com/sun/star/document/NoSuchFilterRequest.hpp>
 #include <com/sun/star/document/XDocumentProperties.hpp>
 #include <com/sun/star/document/XDocumentPropertiesSupplier.hpp>
 #include <com/sun/star/document/XTypeDetection.hpp>
@@ -225,4 +225,5 @@
 #include <unicode/uchar.h>
 #include <uno/data.h>
 #include <vector>
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/misc/random.cxx b/comphelper/source/misc/random.cxx
new file mode 100644
index 000000000000..a97608649bbf
--- /dev/null
+++ b/comphelper/source/misc/random.cxx
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Contributor(s):
+ *   Copyright (C) 2012 Tino Kluge <tino.kluge@hrz.tu-chemnitz.de>
+ */
+
+#include <boost/random.hpp>
+
+#include <comphelper/random.hxx>
+
+// this is nothing but a simple wrapper around
+// the boost random generators
+
+namespace comphelper
+{
+namespace rng
+{
+
+// underlying random number generator
+// boost::mt19937 implements the Mersenne twister algorithm which
+// is fast and has good statistical properties, it produces integers
+// in the range of [0, 2^32-1] internally
+// memory requirement: 625*sizeof(uint32_t)
+// http://en.wikipedia.org/wiki/Mersenne_twister
+#define BOOST_RNG_ALGO  boost::mt19937
+BOOST_RNG_ALGO global_rng;
+
+// initialises the state of the global random number generator
+// should only be called once at the start of the main programme
+// (note, a few boost::variate_generator<> (like normal) have their
+// own state which would need a reset as well to guarantee identical
+// sequence of numbers, e.g. via myrand.distribution().reset())
+void seed(int i)
+{
+    global_rng.seed(i);
+}
+
+// uniform [0,1) or [a,b) distribution
+double uniform()
+{
+    static boost::uniform_01<BOOST_RNG_ALGO&> myrand(global_rng);
+    return myrand();
+}
+
+} // namespace
+} // namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */