github.com/kaydxh/golang@v0.0.131/pkg/gocv/cgo/third_path/opencv4/include/opencv2/flann/logger.h (about)

     1  /***********************************************************************
     2   * Software License Agreement (BSD License)
     3   *
     4   * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
     5   * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
     6   *
     7   * THE BSD LICENSE
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     9   * Redistribution and use in source and binary forms, with or without
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    14   *    notice, this list of conditions and the following disclaimer.
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    19   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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    21   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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    29   *************************************************************************/
    30  
    31  #ifndef OPENCV_FLANN_LOGGER_H
    32  #define OPENCV_FLANN_LOGGER_H
    33  
    34  //! @cond IGNORED
    35  
    36  #include <stdio.h>
    37  #include <stdarg.h>
    38  
    39  #include "defines.h"
    40  
    41  
    42  namespace cvflann
    43  {
    44  
    45  class Logger
    46  {
    47      Logger() : stream(stdout), logLevel(FLANN_LOG_WARN) {}
    48  
    49      ~Logger()
    50      {
    51          if ((stream!=NULL)&&(stream!=stdout)) {
    52              fclose(stream);
    53          }
    54      }
    55  
    56      static Logger& instance()
    57      {
    58          static Logger logger;
    59          return logger;
    60      }
    61  
    62      void _setDestination(const char* name)
    63      {
    64          if (name==NULL) {
    65              stream = stdout;
    66          }
    67          else {
    68  #ifdef _MSC_VER
    69              if (fopen_s(&stream, name, "w") != 0)
    70                  stream = NULL;
    71  #else
    72              stream = fopen(name,"w");
    73  #endif
    74              if (stream == NULL) {
    75                  stream = stdout;
    76              }
    77          }
    78      }
    79  
    80      int _log(int level, const char* fmt, va_list arglist)
    81      {
    82          if (level > logLevel ) return -1;
    83          int ret = vfprintf(stream, fmt, arglist);
    84          return ret;
    85      }
    86  
    87  public:
    88      /**
    89       * Sets the logging level. All messages with lower priority will be ignored.
    90       * @param level Logging level
    91       */
    92      static void setLevel(int level) { instance().logLevel = level; }
    93  
    94      /**
    95       * Sets the logging destination
    96       * @param name Filename or NULL for console
    97       */
    98      static void setDestination(const char* name) { instance()._setDestination(name); }
    99  
   100      /**
   101       * Print log message
   102       * @param level Log level
   103       * @param fmt Message format
   104       * @return
   105       */
   106      static int log(int level, const char* fmt, ...)
   107      {
   108          va_list arglist;
   109          va_start(arglist, fmt);
   110          int ret = instance()._log(level,fmt,arglist);
   111          va_end(arglist);
   112          return ret;
   113      }
   114  
   115  #define LOG_METHOD(NAME,LEVEL) \
   116      static int NAME(const char* fmt, ...) \
   117      { \
   118          va_list ap; \
   119          va_start(ap, fmt); \
   120          int ret = instance()._log(LEVEL, fmt, ap); \
   121          va_end(ap); \
   122          return ret; \
   123      }
   124  
   125      LOG_METHOD(fatal, FLANN_LOG_FATAL)
   126      LOG_METHOD(error, FLANN_LOG_ERROR)
   127      LOG_METHOD(warn, FLANN_LOG_WARN)
   128      LOG_METHOD(info, FLANN_LOG_INFO)
   129  
   130  private:
   131      FILE* stream;
   132      int logLevel;
   133  };
   134  
   135  }
   136  
   137  //! @endcond
   138  
   139  #endif //OPENCV_FLANN_LOGGER_H