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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();
70 * Starts a context for messages.
72 * \param[in] name Short description of the context.
74 * \see finishContext()
75 * \see MessageStringContext
77 void startContext(const char* name);
79 * Convenience wrapper for startContext(const char *).
81 void startContext(const std::string& name) { startContext(name.c_str()); }
85 void append(const char* message) { append(std::string(message)); }
89 void append(const std::string& message);
91 * Adds a new message if the condition is satisfied..
93 void appendIf(bool condition, const char* message);
95 * Adds a new message if the condition is satisfied.
97 void appendIf(bool condition, const std::string& message);
99 * Ends a context started with startContext().
101 * \see MessageStringContext
103 void finishContext();
105 * Clears all collected messages.
110 * Returns false if any messages have been added.
112 * \returns false if append() has been called at least once.
114 * The return value is identical to `toString().empty()`.
115 * Calls to startContext() or finishContext() do not affect the
116 * return value of this function.
118 bool isEmpty() const;
120 * Returns all collected messages as one string.
122 std::string toString() const;
127 std::unique_ptr<Impl> impl_;
130 /*! \libinternal \brief
131 * Convenience class for creating a message context.
133 * This class provides a RAII-style interface to the
134 * MessageStringCollector::startContext() and
135 * MessageStringCollector::finishContext() methods: finishContext() is called
136 * upon destruction of the object. This avoids the need to call
137 * MessageStringCollector::finishContext() on every possible exit point.
141 bool function(::gmx::MessageStringCollector *errors)
143 ::gmx::MessageStringContext errcontext(errors, "In function()");
144 bool bOk = function2(errors);
145 bOk = function3(errors) && bOk;
151 * \see MessageStringCollector
153 * \ingroup module_utility
155 class MessageStringContext
159 * Adds a context for the given object.
161 MessageStringContext(MessageStringCollector* collector, const char* name) :
162 collector_(*collector)
164 collector_.startContext(name);
167 * Adds a context for the given object.
169 MessageStringContext(MessageStringCollector* collector, const std::string& name) :
170 collector_(*collector)
172 collector_.startContext(name);
175 * Calls MessageStringCollector::finishContext() on the wrapped object.
177 ~MessageStringContext() { collector_.finishContext(); }
180 //! The wrapped object.
181 MessageStringCollector& collector_;
183 GMX_DISALLOW_COPY_AND_ASSIGN(MessageStringContext);
188 #endif // GMX_UTILITY_MESSAGE_STRING_COLLECTOR_H