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msg_stream.h

Go to the documentation of this file.

#ifndef __MSG_STREAM__
#define __MSG_STREAM__


#include <iostream>
#include <string>

namespace Message{


  
class Warning_stream;

inline Warning_stream& done(Warning_stream& w);


class Warning_stream{
    
public:
  inline Warning_stream(const char* head,
                        const bool fatal=false,
                        std::ostream* const output=&std::cerr);

  template<typename T>
  inline Warning_stream& operator<<(const T& to_print);

  inline Warning_stream&
  operator<<(Warning_stream& (*f)(Warning_stream&));

  inline Warning_stream&
  operator<<(std::ostream& (*f)(std::ostream&));

  inline virtual ~Warning_stream();

  friend Warning_stream& done(Warning_stream& w);

  
private:
  bool is_fatal;

  bool output_header;

  std::string header;

  std::ostream* const out;
};



/*
  
  ########################
  # Predefined variables #
  ########################

*/

namespace {
  Warning_stream warning("warning : ",false,&std::cerr);
  Warning_stream error("fatal error : ",true,&std::cerr);
}


  
  
/*

  ##########
  # Macros #
  ##########

 */


#define VALUE_OF(var) #var<<" = "<<var
#define WHERE "fichier : "<<__FILE__<<"    ligne : "<<__LINE__





/*
  
  #############################################
  #############################################
  #############################################
  ######                                 ######
  ######   I M P L E M E N T A T I O N   ######
  ######                                 ######
  #############################################
  #############################################
  #############################################


 */







Warning_stream::Warning_stream(const char* head,
                               const bool fatal,
                               std::ostream* const output)
  :is_fatal(fatal),
   output_header(true),
   header(head),
   out(output) {}

Warning_stream&
Warning_stream::operator<<(Warning_stream& (*f)(Warning_stream&)){
  return f(*this);
}


Warning_stream&
Warning_stream::operator<<(std::ostream& (*f)(std::ostream&)){
  
  f(*out);
  return *this;
}


template<typename T>
Warning_stream&
Warning_stream::operator<<(const T& to_print){
  if (output_header){
    (*out)<<"\n"<<header;
    output_header = false;
  }
  
  (*out)<<to_print;

  return *this;
}


Warning_stream& done(Warning_stream& w){
  *(w.out)<<"\n";
  w.out->flush();
  
  if (w.is_fatal){
    exit(1);
  }

  w.output_header = true;

  return w;
}


Warning_stream::~Warning_stream(){}

} // END OF namespace Message


#endif

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