add RAII-style FixtureLog

test/fixtures/fixture_log_observer.cpp

@@ -3,30 +3,40 @@
 
 namespace mbgl {
 
-FixtureLogObserver::LogMessage::LogMessage(EventSeverity severity_, Event event_, int64_t code_,
-                                          const std::string &msg_)
+FixtureLog::Message::Message(EventSeverity severity_,
+                             Event event_,
+                             int64_t code_,
+                             const std::string& msg_)
     : severity(severity_), event(event_), code(code_), msg(msg_) {
 }
 
-bool FixtureLogObserver::LogMessage::operator==(const LogMessage &rhs) const {
-    return severity == rhs.severity &&
-           event == rhs.event &&
-           code == rhs.code &&
-           msg == rhs.msg;
+bool FixtureLog::Message::operator==(const Message& rhs) const {
+    return severity == rhs.severity && event == rhs.event && code == rhs.code && msg == rhs.msg;
 }
 
-FixtureLogObserver::~FixtureLogObserver() {
+FixtureLog::Message::Message() : severity(), event(), code(), msg() {
+}
+
+FixtureLog::Observer::Observer(FixtureLog* log_) : log(log_) {
+}
+
+FixtureLog::Observer::~Observer() {
+    if (log) {
+        log->observer = nullptr;
+    }
     std::cerr << unchecked();
 }
 
-bool FixtureLogObserver::onRecord(EventSeverity severity, Event event, int64_t code,
-                                  const std::string &msg) {
+bool FixtureLog::Observer::onRecord(EventSeverity severity,
+                                    Event event,
+                                    int64_t code,
+                                    const std::string& msg) {
     messages.emplace_back(severity, event, code, msg);
 
     return true;
 }
 
-size_t FixtureLogObserver::count(const LogMessage &message) const {
+size_t FixtureLog::Observer::count(const Message& message) const {
     size_t message_count = 0;
     for (const auto& msg : messages) {
         if (msg == message) {
@@ -37,8 +47,22 @@ size_t FixtureLogObserver::count(const LogMessage &message) const {
     return message_count;
 }
 
-std::vector<FixtureLogObserver::LogMessage> FixtureLogObserver::unchecked() const {
-    std::vector<LogMessage> unchecked_messages;
+FixtureLog::FixtureLog() : observer(new FixtureLogObserver(this)) {
+    Log::setObserver(std::unique_ptr<Log::Observer>(observer));
+}
+
+size_t FixtureLog::count(const FixtureLog::Message& message) const {
+    return observer ? observer->count(message) : 0;
+}
+
+FixtureLog::~FixtureLog() {
+    if (observer) {
+        Log::removeObserver();
+    }
+}
+
+std::vector<FixtureLog::Message> FixtureLogObserver::unchecked() const {
+    std::vector<Message> unchecked_messages;
     for (const auto& msg : messages) {
         if (!msg.checked) {
             unchecked_messages.push_back(msg);
@@ -48,19 +72,18 @@ std::vector<FixtureLogObserver::LogMessage> FixtureLogObserver::unchecked() cons
     return unchecked_messages;
 }
 
-::std::ostream &operator<<(::std::ostream &os,
-                           const std::vector<FixtureLogObserver::LogMessage> &messages) {
+::std::ostream& operator<<(::std::ostream& os, const std::vector<FixtureLog::Message>& messages) {
     for (const auto& message : messages) {
         os << "- " << message;
     }
     return os;
 }
 
-::std::ostream &operator<<(::std::ostream &os, const FixtureLogObserver::LogMessage &message) {
+::std::ostream& operator<<(::std::ostream& os, const FixtureLog::Message& message) {
     os << "[\"" << message.severity << "\", \"" << message.event << "\"";
     os << ", " << message.code;
     os << ", \"" << message.msg << "\"";
     return os << "]" << std::endl;
 }
 
-}
+} // namespace mbgl

test/fixtures/fixture_log_observer.hpp

@@ -9,12 +9,13 @@
 
 namespace mbgl {
 
-class FixtureLogObserver : public Log::Observer {
+class FixtureLog {
 public:
-    struct LogMessage {
-        LogMessage(EventSeverity severity_, Event event_, int64_t code_, const std::string &msg_);
+    struct Message {
+        Message(EventSeverity severity_, Event event_, int64_t code_, const std::string &msg_);
+        Message();
 
-        bool operator==(const LogMessage &rhs) const;
+        bool operator==(const Message& rhs) const;
 
         const EventSeverity severity;
         const Event event;
@@ -24,22 +25,43 @@ public:
         mutable bool checked = false;
     };
 
-    ~FixtureLogObserver();
+    class Observer : public Log::Observer {
+    public:
+        using LogMessage = Message;
 
-    // Log::Observer implementation
-    virtual bool onRecord(EventSeverity severity, Event event, int64_t code, const std::string &msg) override;
+        Observer(FixtureLog* log = nullptr);
+        ~Observer();
 
-    size_t count(const LogMessage &message) const;
-    std::vector<LogMessage> unchecked() const;
+        // Log::Observer implementation
+        virtual bool onRecord(EventSeverity severity,
+                              Event event,
+                              int64_t code,
+                              const std::string& msg) override;
 
-public:
-    std::vector<LogMessage> messages;
+        size_t count(const Message& message) const;
+        std::vector<Message> unchecked() const;
+
+    public:
+        FixtureLog* log;
+        std::vector<Message> messages;
+    };
+
+    FixtureLog();
+
+    size_t count(const Message& message) const;
+
+    ~FixtureLog();
+
+private:
+    Observer* observer;
 };
 
 ::std::ostream &operator<<(::std::ostream &os,
-                           const std::vector<FixtureLogObserver::LogMessage> &messages);
-::std::ostream &operator<<(::std::ostream &os, const FixtureLogObserver::LogMessage &message);
+                           const std::vector<FixtureLog::Observer::LogMessage> &messages);
+::std::ostream &operator<<(::std::ostream &os, const FixtureLog::Observer::LogMessage &message);
 
-}
+using FixtureLogObserver = FixtureLog::Observer;
+
+} // namespace mbgl
 
 #endif