util.cxx

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//
// util.cpp
//     Utility functions needed here and there.
//
// Author:  Jens Wilberg, Lukas Aymans, Christoph Dalitz
// Date:    2019-04-02
// License: see ../LICENSE
//
 
#include "util.h"
 
#include <sstream>
#include <stdexcept>
#include <string>
 
//-------------------------------------------------------------------
// converts *str* to double.
// If str is not a number a invalid_argument exception is thrown.
//-------------------------------------------------------------------
double stod(const char *s)
{
   double result;
 
   // remove leading and trailing white space
   std::string str(s);
   str.erase(0, str.find_first_not_of("\t\r\n "));
   str.erase(str.find_last_not_of("\t\r\n ") + 1);
 
   // use istream for conversion
   std::istringstream iss(str);
 
   iss >> std::ws >> result;
   if (iss.fail() || !iss.eof()) {
      throw std::invalid_argument("not a number");
   }
   return result;
}