format-cout.hpp

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/*
  FORMAT-COUT.hpp  -  use custom string conversions in stream output
 
   Copyright (C)
     2016,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
*/
 
 
#ifndef LIB_FORMAT_COUT_H
#define LIB_FORMAT_COUT_H
 
#include "lib/format-obj.hpp"
 
#include <string>
#include <iostream>
 
// make those generally visible
using std::cout;
using std::cerr;
using std::endl;
 
 
 
 
namespace std {
  
  namespace { // toggle for the following generic overloads of operator<<
    
    template<typename X>
    using enable_StringConversion = lib::meta::enable_if< lib::meta::use_StringConversion4Stream<X>>;
  }
  
  
  template<typename _CharT, typename _Traits, typename X, typename =    enable_StringConversion<X>>
  inline basic_ostream<_CharT, _Traits>&
  operator<< (basic_ostream<_CharT, _Traits>& os, X const& obj)
  {
    return os << util::StringConv<X>::invoke (obj);
  }
  
  
  template<typename _CharT, typename _Traits, typename X, typename =    enable_StringConversion<X>>
  inline basic_ostream<_CharT, _Traits>&
  operator<< (basic_ostream<_CharT, _Traits>& os, X const* ptr)
  {
    if (ptr)
      return util::showAdr(os, ptr) << " ↗" << util::StringConv<X>::invoke (*ptr);
    else
      return os << "⟂ «" << lib::meta::typeStr<X>() << "»";
  }
  
  
  
} // namespace std
#endif /*LIB_FORMAT_COUT_H*/