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/****************************************************************************
* 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>
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
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