Util.h

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// this is for emacs file handling -*- mode: c++; indent-tabs-mode: nil -*-

// -- BEGIN LICENSE BLOCK ----------------------------------------------
// This file is part of FZIs ic_workspace.
//
// This program is free software licensed under the LGPL
// (GNU LESSER GENERAL PUBLIC LICENSE Version 3).
// You can find a copy of this license in LICENSE folder in the top
// directory of the source code.
//
// © Copyright 2016 FZI Forschungszentrum Informatik, Karlsruhe, Germany
//
// -- END LICENSE BLOCK ------------------------------------------------

//----------------------------------------------------------------------
//----------------------------------------------------------------------
#ifndef ICL_CORE_CONFIG_UTIL_H_INCLUDED
#define ICL_CORE_CONFIG_UTIL_H_INCLUDED

#include <iostream>
#include <iomanip>
#include <sstream>
#include <stdexcept>
#include <boost/algorithm/string.hpp>

namespace icl_core {
namespace config {
namespace impl {

template <typename T, typename U>
T hexical_cast(U input)
{
  std::stringstream interpreter;
  interpreter.setf(std::ios::fmtflags(), std::ios::basefield);
  interpreter << input;
  T result;
  interpreter >> result;
  return result;
}

template <typename U>
bool bool_cast(U input)
{
  std::stringstream interpreter;
  interpreter.setf(std::ios::fmtflags(), std::ios::basefield);
  interpreter << input;
  std::string result;
  interpreter >> result;
  boost::algorithm::to_lower(result);
  if (result == "1" || result == "yes" || result == "true")
  {
    return true;
  }
  else
  {
    return false;
  }
}

template <typename U>
bool strict_bool_cast(U input)
{
  std::stringstream interpreter;
  interpreter.setf(std::ios::fmtflags(), std::ios::basefield);
  interpreter << input;
  std::string result;
  interpreter >> result;
  boost::algorithm::to_lower(result);
  if (result == "1" || result == "yes" || result == "true")
  {
    return true;
  }
  else if (result == "0" || result == "no" || result == "false")
  {
    return false;
  }
  else
  {
    throw std::invalid_argument("Not a boolean value: " + result);
  }
}

}
}
}

#endif