1 This is autosprintf.info, produced by makeinfo version 4.6 from
4 INFO-DIR-SECTION C++ libraries
6 * autosprintf: (autosprintf). Support for printf format strings in C++.
9 This file provides documentation for GNU `autosprintf' library.
11 Copyright (C) 2002 Free Software Foundation, Inc.
13 Permission is granted to make and distribute verbatim copies of this
14 manual provided the copyright notice and this permission notice are
15 preserved on all copies.
17 Permission is granted to copy and distribute modified versions of
18 this manual under the conditions for verbatim copying, provided that
19 the entire resulting derived work is distributed under the terms of a
20 permission notice identical to this one.
22 Permission is granted to copy and distribute translations of this
23 manual into another language, under the above conditions for modified
24 versions, except that this permission notice may be stated in a
25 translation approved by the Foundation.
28 File: autosprintf.info, Node: Top, Next: Introduction, Prev: (dir), Up: (dir)
33 This manual documents the GNU autosprintf class, version 1.0.
37 * Introduction:: Introduction
38 * Class autosprintf:: The `autosprintf' class
39 * Using autosprintf:: Using `autosprintf' in own programs
42 File: autosprintf.info, Node: Introduction, Next: Class autosprintf, Prev: Top, Up: Top
47 This package makes the C formatted output routines (`fprintf' et al.)
48 usable in C++ programs, for use with the `<string>' strings and the
51 It allows to write code like
53 cerr << autosprintf ("syntax error in %s:%d: %s", filename, line, errstring);
57 cerr << "syntax error in " << filename << ":" << line << ": " << errstring;
59 The benefits of the autosprintf syntax are:
61 * It reuses the standard POSIX printf facility. Easy migration from
64 * English sentences are kept together.
66 * It makes internationalization possible. Internationalization
67 requires format strings, because in some cases the translator
68 needs to change the order of a sentence, and more generally it is
69 easier for the translator to work with a single string for a
70 sentence than with multiple string pieces.
72 * It reduces the risk of programming errors due to forgotten state
73 in the output stream (e.g. `cout << hex;' not followed by `cout <<
77 File: autosprintf.info, Node: Class autosprintf, Next: Using autosprintf, Prev: Introduction, Up: Top
79 The `autosprintf' class
80 ***********************
82 An instance of class `autosprintf' just contains a string with the
83 formatted output result. Such an instance is usually allocated as an
84 automatic storage variable, i.e. on the stack, not with `new' on the
87 The constructor `autosprintf (const char *format, ...)' takes a
88 format string and additional arguments, like the C function `printf'.
90 Conversions to `char *' and `std::string' are defined that return
91 the encapsulated string.
93 The destructor `~autosprintf ()' destroys the encapsulated string.
95 An `operator <<' is provided that outputs the encapsulated string to
99 File: autosprintf.info, Node: Using autosprintf, Prev: Class autosprintf, Up: Top
101 Using `autosprintf' in own programs
102 ***********************************
104 To use the `autosprintf' class in your programs, you need to add
106 #include "autosprintf.h"
107 using gnu::autosprintf;
109 to your source code. The include file defines the class `autosprintf',
110 in a namespace called `gnu'. The `using' statement makes it possible to
111 use the class without the (otherwise natural) `gnu::' prefix.
113 When linking your program, you need to link with `libasprintf',
114 because that's where the class is defined. In projects using GNU
115 `autoconf', this means adding `AC_LIB_LINKFLAGS([asprintf])' to
116 `configure.in' or `configure.ac', and using the @LIBASPRINTF@ Makefile
117 variable that it provides.
123 Node: Introduction
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124 Node: Class autosprintf
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125 Node: Using autosprintf
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