| Current File : //usr/include/autosprintf.h |
/* Class autosprintf - formatted output to an ostream.
Copyright (C) 2002, 2012-2016 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 */