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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 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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You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.
A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an “aggregate” if the copyright resulting from the compilation is not used to limit the legal rights of the compilation's users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.
If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document's Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.
Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.
If a section in the Document is Entitled “Acknowledgements”, “Dedications”, or “History”, the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.
You may not copy, modify, sublicense, or distribute the Document except as expressly provided for under this License. Any other attempt to copy, modify, sublicense or distribute the Document is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance.
The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See https://www.gnu.org/copyleft/.
Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation.
To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:
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 1.2 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''. |
If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with…Texts.” line with this:
with the Invariant Sections being list their titles, with
the Front-Cover Texts being list, and with the Back-Cover Texts
being list.
|
If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.
If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.
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