C++のメモ

  std::string str = "3.1415";
  double pi = boost::lexical_cast<double>( str ); 
  // pi = 3.1415

  str = "6.02E23"; 
  double mol = boost::lexical_cast<double>( str);
  // mol = 6.02E23

  str = " 9.8";
  std::string str2 = "2.71828 ";
  try
  {
    double g = boost::lexical_cast<double>(str);  //NG
    double e = boost::lexical_cast<double>(str2); //NG 
  //  --> throw boost::bad_lexical_cast
  }
  catch(boost::bad_lexical_cast e)
  {
    std::cerr << e << std::endl;
    std::cerr << "Space is not acceptable in lexical_cast." << std::endl;
  }