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01: /* Class autosprintf - formatted output to an ostream.
02:    Copyright (C) 2002 Free Software Foundation, Inc.
03: 
04:    This program is free software; you can redistribute it and/or modify it
05:    under the terms of the GNU Library General Public License as published
06:    by the Free Software Foundation; either version 2, or (at your option)
07:    any later version.
08: 
09:    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 */
67: 

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