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/* 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 */