/* Class autosprintf - formatted output to an ostream.

   Copyright (C) 2002, 2012-2015 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU Lesser General Public License as published by

   the Free Software Foundation; either version 2.1 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef _AUTOSPRINTF_H

#define _AUTOSPRINTF_H

/* This feature is available in gcc versions 2.5 and later.  */

#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__

# define _AUTOSPRINTF_ATTRIBUTE_FORMAT() /* empty */

#else

/* The __-protected variants of 'format' and 'printf' attributes

   are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */

# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)

#  define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \

  __attribute__ ((__format__ (__printf__, 2, 3)))

# else

#  define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \

  __attribute__ ((format (printf, 2, 3)))

# endif

#endif

#include <string>

#include <iostream>

namespace gnu

{

  /* A temporary object, usually allocated on the stack, representing

     the result of an asprintf() call.  */

  class autosprintf

  {

  public:

    /* Constructor: takes a format string and the printf arguments.  */

    autosprintf (const char *format, ...)

                _AUTOSPRINTF_ATTRIBUTE_FORMAT();

    /* Copy constructor.  */

    autosprintf (const autosprintf& src);

    autosprintf& operator = (autosprintf copy);

    /* Destructor: frees the temporarily allocated string.  */

    ~autosprintf ();

    /* Conversion to string.  */

    operator char * () const;

    operator std::string () const;

    /* Output to an ostream.  */

    friend inline std::ostream& operator<< (std::ostream& stream, const autosprintf& tmp)

    {

      stream << (tmp.str ? tmp.str : "(error in autosprintf)");

      return stream;

    }

  private:

    char *str;

  };

}

#endif /* _AUTOSPRINTF_H */