This manual documents the GNU autosprintf class, version 1.0.
This package makes the C formatted output routines (fprintf et al.)
usable in C++ programs, for use with the <string> strings and the
<iostream> streams.
It allows to write code like
cerr << autosprintf ("syntax error in %s:%d: %s", filename, line, errstring);
|
instead of
cerr << "syntax error in " << filename << ":" << line << ": " << errstring; |
The benefits of the autosprintf syntax are:
cout << hex; not followed by cout << dec;).
autosprintf class An instance of class autosprintf just contains a string with the
formatted output result. Such an instance is usually allocated as an
automatic storage variable, i.e. on the stack, not with new on the
heap.
The constructor autosprintf (const char *format, ...) takes a format
string and additional arguments, like the C function printf.
Conversions to char * and std::string are defined that return
the encapsulated string. The conversion to char * returns a freshly
allocated copy of the encapsulated string; it needs to be freed using
delete[]. The conversion to std::string returns a copy of
the encapsulated string, with automatic memory management.
The destructor ~autosprintf () destroys the encapsulated string.
An operator << is provided that outputs the encapsulated string to the
given ostream.
autosprintf in own programs To use the autosprintf class in your programs, you need to add
#include "autosprintf.h" using gnu::autosprintf; |
to your source code.
The include file defines the class autosprintf, in a namespace called
gnu. The ‘using’ statement makes it possible to use the class
without the (otherwise natural) gnu:: prefix.
When linking your program, you need to link with libasprintf, because
that's where the class is defined. In projects using GNU autoconf,
this means adding ‘AC_LIB_LINKFLAGS([asprintf])’ to configure.in
or configure.ac, and using the @LIBASPRINTF@ Makefile variable that
it provides.
The files of this package are covered by the licenses indicated in each particular file or directory. Here is a summary:
libasprintf library is covered by the
GNU Lesser General Public License (LGPL), either version 2.1 of the
License, or (at your option) any later version published by the
Free Software Foundation (FSF).
A copy of the license is included in GNU LESSER GENERAL PUBLIC LICENSE.
Version 2.1, February 1999
Copyright © 1991, 1999 Free Software Foundation, Inc. <https://fsf.org/> Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. [This is the first released version of the Lesser GPL. It also counts as the successor of the GNU Library Public License, version 2, hence the version number 2.1.] |
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Copyright (C) year your name. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. |
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