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134 lines
4.7 KiB
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134 lines
4.7 KiB
Plaintext
This is autosprintf.info, produced by makeinfo version 5.1 from
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autosprintf.texi.
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Copyright (C) 2002-2003, 2006-2007 Free Software Foundation, Inc.
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This manual is free documentation. It is dually licensed under the
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GNU FDL and the GNU GPL. This means that you can redistribute this
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manual under either of these two licenses, at your choice.
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This manual is covered by the GNU FDL. Permission is granted to copy,
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distribute and/or modify this document under the terms of the GNU Free
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Documentation License (FDL), either version 1.2 of the License, or (at
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your option) any later version published by the Free Software Foundation
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(FSF); with no Invariant Sections, with no Front-Cover Text, and with no
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Back-Cover Texts. A copy of the license is at
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<http://www.gnu.org/licenses/fdl.html>.
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This manual is covered by the GNU GPL. You can redistribute it and/or
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modify it under the terms of the GNU General Public License (GPL),
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either version 2 of the License, or (at your option) any later version
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published by the Free Software Foundation (FSF). A copy of the license
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is at <http://www.gnu.org/licenses/gpl.html>.
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INFO-DIR-SECTION C++ libraries
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START-INFO-DIR-ENTRY
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* autosprintf: (autosprintf). Support for printf format strings in C++.
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END-INFO-DIR-ENTRY
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This file provides documentation for GNU 'autosprintf' library.
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File: autosprintf.info, Node: Top, Next: Introduction, Prev: (dir), Up: (dir)
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GNU autosprintf
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***************
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This manual documents the GNU autosprintf class, version 1.0.
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* Menu:
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* Introduction:: Introduction
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* Class autosprintf:: The 'autosprintf' class
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* Using autosprintf:: Using 'autosprintf' in own programs
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File: autosprintf.info, Node: Introduction, Next: Class autosprintf, Prev: Top, Up: Top
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1 Introduction
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**************
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This package makes the C formatted output routines ('fprintf' et al.)
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usable in C++ programs, for use with the '<string>' strings and the
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'<iostream>' streams.
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It allows to write code like
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cerr << autosprintf ("syntax error in %s:%d: %s", filename, line, errstring);
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instead of
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cerr << "syntax error in " << filename << ":" << line << ": " << errstring;
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The benefits of the autosprintf syntax are:
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* It reuses the standard POSIX printf facility. Easy migration from
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C to C++.
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* English sentences are kept together.
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* It makes internationalization possible. Internationalization
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requires format strings, because in some cases the translator needs
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to change the order of a sentence, and more generally it is easier
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for the translator to work with a single string for a sentence than
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with multiple string pieces.
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* It reduces the risk of programming errors due to forgotten state in
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the output stream (e.g. 'cout << hex;' not followed by 'cout <<
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dec;').
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File: autosprintf.info, Node: Class autosprintf, Next: Using autosprintf, Prev: Introduction, Up: Top
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2 The 'autosprintf' class
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*************************
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An instance of class 'autosprintf' just contains a string with the
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formatted output result. Such an instance is usually allocated as an
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automatic storage variable, i.e. on the stack, not with 'new' on the
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heap.
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The constructor 'autosprintf (const char *format, ...)' takes a
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format string and additional arguments, like the C function 'printf'.
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Conversions to 'char *' and 'std::string' are defined that return the
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encapsulated string. The conversion to 'char *' returns a freshly
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allocated copy of the encapsulated string; it needs to be freed using
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'delete[]'. The conversion to 'std::string' returns a copy of the
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encapsulated string, with automatic memory management.
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The destructor '~autosprintf ()' destroys the encapsulated string.
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An 'operator <<' is provided that outputs the encapsulated string to
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the given 'ostream'.
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File: autosprintf.info, Node: Using autosprintf, Prev: Class autosprintf, Up: Top
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3 Using 'autosprintf' in own programs
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*************************************
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To use the 'autosprintf' class in your programs, you need to add
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#include "autosprintf.h"
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using gnu::autosprintf;
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to your source code. The include file defines the class 'autosprintf',
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in a namespace called 'gnu'. The 'using' statement makes it possible to
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use the class without the (otherwise natural) 'gnu::' prefix.
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When linking your program, you need to link with 'libasprintf',
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because that's where the class is defined. In projects using GNU
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'autoconf', this means adding 'AC_LIB_LINKFLAGS([asprintf])' to
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'configure.in' or 'configure.ac', and using the @LIBASPRINTF@ Makefile
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variable that it provides.
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Tag Table:
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Node: Top1339
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Node: Introduction1699
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Node: Class autosprintf2852
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Node: Using autosprintf3863
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End Tag Table
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