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35 /*! \libinternal \file
37 * Declares ::gmx::MessageStringCollector.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_utility
43 #ifndef GMX_UTILITY_MESSAGE_STRING_COLLECTOR_H
44 #define GMX_UTILITY_MESSAGE_STRING_COLLECTOR_H
49 #include "gromacs/utility/classhelpers.h"
54 /*! \libinternal \brief
55 * Helper class for collecting message strings, optionally with context.
57 * After strings have been collected, they can be formatted into one long
58 * string for, e.g., printing out or for including in an exception.
61 * \ingroup module_utility
63 class MessageStringCollector
66 MessageStringCollector();
67 ~MessageStringCollector();
68 MessageStringCollector(MessageStringCollector&& /*unused*/) noexcept;
69 MessageStringCollector& operator=(MessageStringCollector&& /*unused*/) noexcept;
72 * Starts a context for messages.
74 * \param[in] name Short description of the context.
76 * \see finishContext()
77 * \see MessageStringContext
79 void startContext(const char* name);
81 * Convenience wrapper for startContext(const char *).
83 void startContext(const std::string& name) { startContext(name.c_str()); }
87 void append(const char* message) { append(std::string(message)); }
91 void append(const std::string& message);
93 * Adds a new message if the condition is satisfied..
95 void appendIf(bool condition, const char* message);
97 * Adds a new message if the condition is satisfied.
99 void appendIf(bool condition, const std::string& message);
101 * Ends a context started with startContext().
103 * \see MessageStringContext
105 void finishContext();
107 * Clears all collected messages.
112 * Returns false if any messages have been added.
114 * \returns false if append() has been called at least once.
116 * The return value is identical to `toString().empty()`.
117 * Calls to startContext() or finishContext() do not affect the
118 * return value of this function.
120 bool isEmpty() const;
122 * Returns all collected messages as one string.
124 std::string toString() const;
129 std::unique_ptr<Impl> impl_;
132 /*! \libinternal \brief
133 * Convenience class for creating a message context.
135 * This class provides a RAII-style interface to the
136 * MessageStringCollector::startContext() and
137 * MessageStringCollector::finishContext() methods: finishContext() is called
138 * upon destruction of the object. This avoids the need to call
139 * MessageStringCollector::finishContext() on every possible exit point.
143 bool function(::gmx::MessageStringCollector *errors)
145 ::gmx::MessageStringContext errcontext(errors, "In function()");
146 bool bOk = function2(errors);
147 bOk = function3(errors) && bOk;
153 * \see MessageStringCollector
155 * \ingroup module_utility
157 class MessageStringContext
161 * Adds a context for the given object.
163 MessageStringContext(MessageStringCollector* collector, const char* name) :
164 collector_(*collector)
166 collector_.startContext(name);
169 * Adds a context for the given object.
171 MessageStringContext(MessageStringCollector* collector, const std::string& name) :
172 collector_(*collector)
174 collector_.startContext(name);
177 * Calls MessageStringCollector::finishContext() on the wrapped object.
179 ~MessageStringContext() { collector_.finishContext(); }
182 //! The wrapped object.
183 MessageStringCollector& collector_;
185 GMX_DISALLOW_COPY_AND_ASSIGN(MessageStringContext);
190 #endif // GMX_UTILITY_MESSAGE_STRING_COLLECTOR_H