text: // Copyright (c) 2018, ETH Zurich and UNC Chapel Hill.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //
  //     * Redistributions in binary form must reproduce the above copyright
  //       notice, this list of conditions and the following disclaimer in the
  //       documentation and/or other materials provided with the distribution.
  //
  //     * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
  //       its contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  //
  // Author: Johannes L. Schoenberger (jsch at inf.ethz.ch)
  
  #ifndef COLMAP_SRC_UTIL_LOGGING_H_
  #define COLMAP_SRC_UTIL_LOGGING_H_
  
  #include <iostream>
  
  #include <glog/logging.h>
  
  #include "util/string.h"
  
  // Option checker macros. In contrast to glog, this function does not abort the
  // program, but simply returns false on failure.
  #define CHECK_OPTION_IMPL(expr) \
    __CheckOptionImpl(__FILE__, __LINE__, (expr), #expr)
  #define CHECK_OPTION(expr)                                     \
    if (!__CheckOptionImpl(__FILE__, __LINE__, (expr), #expr)) { \
      return false;                                              \
    }
  #define CHECK_OPTION_OP(name, op, val1, val2)                              \
    if (!__CheckOptionOpImpl(__FILE__, __LINE__, (val1 op val2), val1, val2, \
                             #val1, #val2, #op)) {                           \
      return false;                                                          \
    }
  #define CHECK_OPTION_EQ(val1, val2) CHECK_OPTION_OP(_EQ, ==, val1, val2)
  #define CHECK_OPTION_NE(val1, val2) CHECK_OPTION_OP(_NE, !=, val1, val2)
  #define CHECK_OPTION_LE(val1, val2) CHECK_OPTION_OP(_LE, <=, val1, val2)
  #define CHECK_OPTION_LT(val1, val2) CHECK_OPTION_OP(_LT, <, val1, val2)
  #define CHECK_OPTION_GE(val1, val2) CHECK_OPTION_OP(_GE, >=, val1, val2)
  #define CHECK_OPTION_GT(val1, val2) CHECK_OPTION_OP(_GT, >, val1, val2)
  
  namespace colmap {
  
  // Initialize glog at the beginning of the program.
  void InitializeGlog(char** argv);
  
  ////////////////////////////////////////////////////////////////////////////////
  // Implementation
  ////////////////////////////////////////////////////////////////////////////////
  
  const char* __GetConstFileBaseName(const char* file);
  
  bool __CheckOptionImpl(const char* file, const int line, const bool result,
                         const char* expr_str);
  
  template <typename T1, typename T2>
  bool __CheckOptionOpImpl(const char* file, const int line, const bool result,
                           const T1& val1, const T2& val2, const char* val1_str,
                           const char* val2_str, const char* op_str) {
    if (result) {
      return true;
    } else {
      std::cerr << StringPrintf("[%s:%d] Check failed: %s %s %s (%s vs. %s)",
                                __GetConstFileBaseName(file), line, val1_str,
                                op_str, val2_str, std::to_string(val1).c_str(),
                                std::to_string(val2).c_str())
                << std::endl;
      return false;
    }
  }
  
  }  // namespace colmap
  
  #endif  // COLMAP_SRC_UTIL_LOGGING_H_
  