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This manual documents the GNU autosprintf class, version 1.0.
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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;).
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autosprintf classAn 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.
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autosprintf in own programsTo 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.
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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.
Next: GNU GENERAL PUBLIC LICENSE, Up: Licenses [Contents]
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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Copyright © 1989, 1991 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.
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In the combination, you must combine any sections Entitled “History” in the various original documents, forming one section Entitled “History”; likewise combine any sections Entitled “Acknowledgements”, and any sections Entitled “Dedications”. You must delete all sections Entitled “Endorsements.”
You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.
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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.
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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.
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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
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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.