add vcglib

vcglib/wrap/callback.h

@@ -0,0 +1,83 @@
+/****************************************************************************
+* VCGLib                                                            o o     *
+* Visual and Computer Graphics Library                            o     o   *
+*                                                                _   O  _   *
+* Copyright(C) 2004-2016                                           \/)\/    *
+* Visual Computing Lab                                            /\/|      *
+* ISTI - Italian National Research Council                           |      *
+*                                                                    \      *
+* All rights reserved.                                                      *
+*                                                                           *
+* 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 2 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 (http://www.gnu.org/licenses/gpl.txt)          *
+* for more details.                                                         *
+*                                                                           *
+****************************************************************************/
+
+#ifndef __VCGLIB_CALLBACK
+#define __VCGLIB_CALLBACK
+
+#include <stdarg.h>  // For va_start, etc.
+#include <memory>    // For std::unique_ptr
+#include <iostream>
+#include <string.h>
+
+namespace vcg {
+/*! \brief This function allow lenghty algorithms to report progress and status.
+ *  
+ * This function is usually called from inside a long processing algorithm 
+ * with a reasonable frequency (e.g. not more that 10 times per sec) 
+ * reporting the what the algorithm is doing and at what point of the processing (as a int percentage) 
+ * we currently are. 
+ * 
+ * Users of the library usually rewrote this function to handle this reporting in the correct way 
+ * (e.g. in a log window and in a progress bar).
+ * 
+ * The algorithms in the library should also check the return value 
+ * to see if the user asked for an interruption, but they can ignore this request
+ * (hint: most of algs in the lib ignore any request).
+ */
+
+typedef bool CallBackPos(const int pos, const char * str );
+
+inline bool DummyCallBackPos(const int ,  const char * ) {return true;}
+inline bool COutCallBackPos(const int ,  const char *str ) {
+  std::cout << str; return true;
+}
+inline bool CErrCallBackPos(const int ,  const char *str ) {
+  std::cerr << str; return true;
+}
+
+/*! \brief Helper function that formats a string a la printf and returns a simple char*
+ * 
+ * Quite useful for formatting the above callback... 
+ */
+
+inline char* StrFormat(const std::string fmt_str, ...) {
+    int final_n, n = ((int)fmt_str.size()) * 2; /* Reserve two times as much as the length of the fmt_str */
+    std::unique_ptr<char[]> formatted;
+    va_list ap;
+    while(1) {
+        formatted.reset(new char[n]); /* Wrap the plain char array into the unique_ptr */
+        strcpy(&formatted[0], fmt_str.c_str());
+        va_start(ap, fmt_str);
+        final_n = vsnprintf(&formatted[0], n, fmt_str.c_str(), ap);
+        va_end(ap);
+        if (final_n < 0 || final_n >= n)
+            n += abs(final_n - n + 1);
+        else
+            break;
+    }
+    return formatted.get();
+}
+
+}// End namespace
+
+#endif