Diff: tvmet/Io.h

Revision:

1:6799c07fe510

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tvmet/Io.h	Wed Nov 07 14:37:35 2012 +0000
@@ -0,0 +1,69 @@
+/*
+ * 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: Io.h,v 1.8 2007-06-23 15:58:58 opetzold Exp $
+ */
+
+#ifndef TVMET_IO_H
+#define TVMET_IO_H
+
+namespace tvmet {
+
+/**
+ * \class IoPrintHelper Io.h "tvmet/Io.h"
+ * \brief Determines the number of digits regarding the sign of the
+ *        container.
+ *        This class is nesessary due to the complex type and the
+ *        function min(), which are not defined for this type.
+ *        So we have to dispatch between pod and complex types
+ *        to get an information about the extra space for signs.
+ */
+template<class C>
+class IoPrintHelper {
+  IoPrintHelper();
+  IoPrintHelper(const IoPrintHelper&);
+  IoPrintHelper& operator=(const IoPrintHelper&);
+
+private:
+  static std::streamsize width(const C& e) {
+    std::streamsize w = static_cast<std::streamsize>(std::log10(max(abs(e)))+1);
+    return w > 0 ? w : 0;
+  }
+
+public:
+  static std::streamsize width(dispatch<true>, const C& e) {
+    return width(e);
+  }
+  static std::streamsize width(dispatch<false>, const C& e) {
+    std::streamsize w = width(e);
+    if(min(e) < 0) return w+1;
+    else return w;
+  }
+};
+
+
+}
+
+#endif /* TVMET_IO_H */
+
+// Local Variables:
+// mode:C++
+// tab-width:8
+// End: