Move clamp from spectrogram to util

util.cpp

@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 2016, Mike Walters <mike@flomp.net>
+ *
+ *  This file is part of inspectrum.
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <algorithm>
+#include "util.h"
+
+template <class T> const T& clamp (const T& value, const T& min, const T& max)
+{
+    return std::min(max, std::max(min, value));
+}
+template const float& clamp(const float&, const float&, const float&);
+template const int& clamp(const int&, const int&, const int&);