Add array randomisation helper routine

Makefile.am

@@ -76,6 +76,7 @@ UTIL_FILES   =		\
     raii.hpp		\
     random.cpp		\
     random.hpp		\
+    random.ipp		\
     range.cpp		\
     range.hpp		\
     region.cpp		\

random.cpp

@@ -22,13 +22,27 @@
 
 #include "range.hpp"
 
+#include <type_traits>
+
 using namespace util;
 
 namespace util {
     template <typename T>
     T
+    random (void) {
+        static_assert (std::is_integral<T>::value, "random should only operate on integral types");
+        return range<T>::UNLIMITED.random ();
+    }
+
+    template <>
+    double
     random (void)
-        { return range<T>::UNLIMITED.random (); }
+        { return range<double>::UNIT.random (); }
+
+    template <>
+    float
+    random (void)
+        { return range<float>::UNIT.random (); }
 
     template <typename T>
     T&

random.hpp

@@ -26,6 +26,9 @@ namespace util {
     template <typename T>
     T& randomise (T &);
 
+    template <typename T, size_t N>
+    T* randomise (T(&)[N]);
+
     template <typename T>
     T random (void);
 
@@ -49,4 +52,6 @@ namespace util {
     }
 }
 
+#include "random.ipp"
+
 #endif

random.ipp

@@ -0,0 +1,32 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2010 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_RANDOM_IPP
+#define __UTIL_RANDOM_IPP
+
+namespace util {
+    template <typename T, size_t N>
+    T* randomise (T (&array)[N]) {
+        for (auto &i: array)
+            i = random<T> ();
+        return array;
+    }
+}
+
+#endif