Diff: tvmet/util/Incrementor.h

Revision:

1:6799c07fe510

diff -r 92019d8564a7 -r 6799c07fe510 tvmet/util/Incrementor.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tvmet/util/Incrementor.h	Wed Nov 07 14:37:35 2012 +0000
@@ -0,0 +1,91 @@
+/*
+ * Tiny Vector Matrix Library
+ * Dense Vector Matrix Libary of Tiny size using Expression Templates
+ *
+ * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Id: Incrementor.h,v 1.7 2007-06-23 15:58:59 opetzold Exp $
+ */
+
+#ifndef TVMET_UTIL_INCREMENTOR_H
+#define TVMET_UTIL_INCREMENTOR_H
+
+namespace tvmet {
+
+namespace util {
+
+
+/**
+ * \class Incrementor Incrementor.h "tvmet/util/Incrementor.h"
+ * \brief A simple incrementor class.
+ * The start value is given at construction time. After
+ * each access the class increments the internal counter.
+ * \ingroup _util_function
+ *
+ * \par Example:
+ * \code
+ * #include <algorithm>
+ *
+ * using namespace tvmet;
+ *
+ * ...
+ *
+ * std::generate(m1.begin(), m1.end(),
+ * util::Incrementor<typename matrix_type::value_type>());
+ * \endcode
+ */
+template<class T>
+struct Incrementor
+{
+  Incrementor(T start=0) : m_inc(start) { }
+  T operator()() { m_inc+=1; return m_inc; }
+
+private:
+  T                             m_inc;
+};
+
+
+#if defined(TVMET_HAVE_COMPLEX)
+/**
+ * \class Incrementor< std::complex<T> > Incrementor.h "tvmet/util/Incrementor.h"
+ * \brief Specialized Incrementor class.
+ * \ingroup _util_function
+ */
+template<class T>
+struct Incrementor< std::complex<T> > {
+  Incrementor(const std::complex<T>& start=0)
+    : m_inc(start) { }
+  std::complex<T> operator()() {
+    m_inc += std::complex<T>(1,1);
+    return m_inc;
+  }
+private:
+  std::complex<T>                       m_inc;
+};
+#endif // defined(TVMET_HAVE_COMPLEX)
+
+
+} // namespace util
+
+} // namespace tvmet
+
+#endif // TVMET_UTIL_INCREMENTOR_H
+
+// Local Variables:
+// mode:C++
+// tab-width:8
+// End: