sto

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_sto
#define tools_sto
 
#include <string>
 
namespace tools {
 
inline bool to(const std::string& a_string,bool& a_value,bool a_def = false){
  if(  (a_string=="1")
     ||(a_string=="true")||(a_string=="TRUE")||(a_string=="True")
     ||(a_string=="yes")||(a_string=="YES")||(a_string=="Yes")
     ||(a_string=="on")||(a_string=="ON")||(a_string=="On")
     ){
    a_value = true;
    return true;
  } else if((a_string=="0")
          ||(a_string=="false")||(a_string=="FALSE")||(a_string=="False")
          ||(a_string=="no")||(a_string=="NO")||(a_string=="No")
          ||(a_string=="off")||(a_string=="OFF")||(a_string=="Off")
          ){
    a_value = false;
    return true;
  } else {
    a_value = a_def;
    return false;
  }
}
 
inline bool tob(const std::string& a_string,bool& a_value,bool a_def = false) {return to(a_string,a_value,a_def);}
 
}
 
#include <sstream>
 
namespace tools {
 
template <class T>
inline bool to(const std::string& a_s,T& a_v,const T& a_def = T()) {
  if(a_s.empty()) {a_v = a_def;return false;} //for TOOLS_STL istringstream.
  std::istringstream strm(a_s.c_str());
  strm >> a_v;
  if(strm.fail()) {a_v = a_def;return false;}
  return strm.eof();
}
 
template <class T>
inline bool to(T& a_field,const std::string& a_s,bool& a_changed){
  T old = a_field;
  //if(!tools::to(a_s,a_field)) {a_field = old;a_changed=false;return false;}
  if(!to(a_s,a_field)) {a_field = old;a_changed=false;return false;}
  a_changed = a_field==old?false:true;
  return true;
}
 
}
 
#include <ostream>
 
namespace tools {
 
template <class T>
inline bool to(std::ostream& a_out,const std::string& a_string,T& a_value){
  if(!to<T>(a_string,a_value)) {
    a_out << "Passed value \"" << a_string << "\""
          << " is of bad type."
          << std::endl;
    return false;
  }
  return true;
}
 
inline bool to(std::ostream& a_out,const std::string& a_string,bool& a_value){
  if(!to(a_string,a_value)) {
    a_out << "Passed value \"" << a_string << "\""
          << " is not a boolean."
          << std::endl;
    return false;
  }
  return true;
}
 
}
 
#include "typedefs"
#include <cstddef> //size_t
 
namespace tools {
 
inline bool to_size_t(const std::string& a_string,size_t& a_value,const size_t& a_def = 0){
  if(sizeof(size_t)==8) {
    uint64 v;
    bool status = to<uint64>(a_string,v,a_def);
    a_value = v;
    return status;
  } else { //assume 4 :
    uint32 v;
    bool status = to<uint32>(a_string,v,(uint32)a_def);
    a_value = v;
    return status;
  }
}
 
}
 
#endif