mingw/include/autosprintf.h

   1 /* Class autosprintf - formatted output to an ostream.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU Library General Public License as published
   6    by the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17    USA.  */
  18
  19 #ifndef _AUTOSPRINTF_H
  20 #define _AUTOSPRINTF_H
  21
  22 #ifndef __attribute__
  23 /* This feature is available in gcc versions 2.5 and later.  */
  24 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
  25 #  define __attribute__(Spec) /* empty */
  26 # endif
  27 /* The __-protected variants of `format' and `printf' attributes
  28    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
  29 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
  30 #  define __format__ format
  31 #  define __printf__ printf
  32 # endif
  33 #endif
  34
  35 #include <string>
  36 #include <iostream>
  37
  38 namespace gnu
  39 {
  40   /* A temporary object, usually allocated on the stack, representing
  41      the result of an asprintf() call.  */
  42   class autosprintf
  43   {
  44   public:
  45     /* Constructor: takes a format string and the printf arguments.  */
  46     autosprintf (const char *format, ...)
  47                 __attribute__ ((__format__ (__printf__, 2, 3)));
  48     /* Copy constructor.  */
  49     autosprintf (const autosprintf& src);
  50     /* Destructor: frees the temporarily allocated string.  */
  51     ~autosprintf ();
  52     /* Conversion to string.  */
  53     operator char * () const;
  54     operator std::string () const;
  55     /* Output to an ostream.  */
  56     friend inline std::ostream& operator<< (std::ostream& stream, const autosprintf& tmp)
  57     {
  58       stream << (tmp.str ? tmp.str : "(error in autosprintf)");
  59       return stream;
  60     }
  61   private:
  62     char *str;
  63   };
  64 }
  65
  66 #endif /* _AUTOSPRINTF_H */