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35 /*! \defgroup module_utility Low-Level Utilities (utility)
36 * \ingroup group_utilitymodules
37 * \brief
38 * Provides low-level utilities for error handling and other tasks.
39 *
40 * This module provides various low-level utilities for tasks such as error
41 * handling and string formatting, as well as helper classes and common custom
42 * containers to simplify implementation of other code. Contents of the module
43 * are discussed in more details under the different headings below.
44 * Some of the code in installed headers in the module is intended for use
45 * directly from code outside the \Gromacs library, but a significant portion
46 * is exposed only because other public headers depend on it.
47 *
48 * Since this module implements error handling, it should be at the lowest
49 * level: it should not depend on other modules. Any functionality needed by
50 * the error handling code should also be kept in this module.
51 *
52 * <H3>Error handling</H3>
53 *
54 * Exception classes used in the library are declared in the exceptions.h header
55 * file. Most \Gromacs-specific exceptions derive from gmx::GromacsException.
56 *
57 * This header also declares a ::GMX_THROW macro that should be used for
58 * throwing exceptions. ::GMX_THROW_WITH_ERRNO is also provided for reporting
59 * syscall errors, but its use should be mostly limited to within the library.
60 * This header also declares helper functions printFatalErrorMessage(),
61 * formatExceptionMessageToString(), and formatExceptionMessageToFile() for
62 * creating standard error messages. processExceptionAtExit() provides
63 * clean-up code before exiting the program after an exception.
64 * To help in cases where bottom-up conversion to C++ is appropriate, macro
65 * ::GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR is also provided to catch all
66 * exceptions at C++ to C boundary.
67 *
68 * Header file gmxassert.h is also provided for assertions. It declares macros
69 * ::GMX_ASSERT and ::GMX_RELEASE_ASSERT that should be used for assertions.
70 *
71 * \if internal
72 * Internally, functions from errorformat.h are used for all the above cases to
73 * format error messages to \c stderr. errorcodes.h provides some common
74 * functionality for classifying errors.
75 * \endif
76 *
77 *
78 * \if libapi
79 *
80 * <H3>Basic file handling and streams</H3>
81 *
82 * The header textstream.h declares interfaces for simple text format streams.
83 * Headers filestream.h and stringstream.h provide implementations for these
84 * streams for reading/writing files and for writing to in-memory strings.
85 *
86 * The header fileredirector.h provides interfaces for redirecting file input
87 * and/or output to alternative streams, for use in testing, as well as default
88 * implementations for these interfaces that just use the file system.
89 *
90 * The header textwriter.h provides gmx::TextWriter for more formatting support
91 * when writing to a text stream. Similarly, textreader.h provides more
92 * formatting support when reading from a text stream.
93 *
94 * The header path.h declares helpers for manipulating paths as strings and for
95 * managing directories and files.
96 * The fate of this header depends on what is decided in Redmine issue #950.
97 *
98 * <H3>Logging</H3>
99 *
100 * The headers logger.h and loggerbuilder.h provide interfaces and classes for
101 * writing log files (or logging to other targets). See \ref page_logging for
102 * an overview.
103 *
104 * \endif
105 *
106 * <H3>Implementation helpers</H3>
107 *
108 * The header basedefinitions.h contains common definitions and macros used
109 * throughout \Gromacs. It includes fixed-width integer types (`gmx_int64_t`
110 * and friends), `gmx_bool` for C code, some macros for compiler-specific
111 * attributes, and ::GMX_UNUSED_VALUE and ::GMX_IGNORE_RETURN_VALUE for
112 * handling warnings about unused values.
113 *
114 * The header classhelpers.h implements a gmx::PrivateImplPointer template for easily
115 * writing classes that use the private implementation idiom. This header also
116 * declares ::GMX_DISALLOW_COPY_AND_ASSIGN and ::GMX_DISALLOW_ASSIGN macros for
117 * class declarations.
118 *
119 * The header flags.h implements a gmx::FlagsTemplate template for better type
120 * safety when using bit flag fields.
121 *
122 *
123 * <H3>Other functionality</H3>
124 *
125 * The header init.h declares gmx::init() and gmx::finalize() for initializing
126 * and deinitializing the \Gromacs library.
127 *
128 * The header arrayref.h implements a gmx::ConstArrayRef class for exposing a
129 * C array or part of a std::vector (basically, any continuous stretch of
130 * memory) throuh a std::vector-like interface.
131 *
132 * The header stringutil.h declares various string utility routines.
133 *
134 * \if libapi
135 *
136 * The header strconvert.h declares string parsing routines.
137 *
138 * The header gmxmpi.h abstracts away the mechanism of including either MPI or
139 * thread-MPI headers depending on compilation options.
140 * Similarly, gmxomp.h removes the need to use conditional compilation for code
141 * that needs to include omp.h for OpenMP functions.
142 *
143 * The header gmxregex.h declares gmx::Regex and regexMatch() for basic regular
144 * expression matching using an interface similar to C++11.
145 *
146 * The header messagestringcollector.h declares a gmx::MessageStringCollector
147 * class for composing messages with context information.
148 *
149 * The header sysinfo.h declares gmx_getpid() for getting the current process
150 * id.
151 *
152 * The header programcontext.h declares a gmx::IProgramContext that is
153 * used to
154 * initialize and access information about the running program, such as the
155 * name and path of the executable. This information is used, e.g., by the
156 * error handling code in formatting standard error messages.
157 *
158 * The header qsort_threadsafe.h provides a guaranteed threadsafe
159 * implementation for qsort().
160 *
161 * \endif
162 *
163 * \author Teemu Murtola <teemu.murtola@gmail.com>
164 */
165 /*! \file
166 * \brief
167 * Public API convenience header for low-level utilities.
168 *
169 * \author Teemu Murtola <teemu.murtola@gmail.com>
170 * \inpublicapi
171 * \ingroup module_utility
172 */
173 #ifndef GMX_UTILITY_H
174 #define GMX_UTILITY_H
182 #endif