rewrite MPSC queue support based on origin/cjappl#19

Author: atsushieno

include/rtlog/rtlog.h

@@ -80,12 +80,34 @@ template <typename T>
 inline constexpr bool has_try_dequeue_v = has_try_dequeue<T>::value;
 } // namespace detail
 
+template<typename T, size_t MaxNumItem>
+class FarbotMPSCQueueWrapper {
+  farbot::fifo<T, farbot::fifo_options::concurrency::single,
+               farbot::fifo_options::concurrency::multiple,
+               farbot::fifo_options::full_empty_failure_mode::
+                   return_false_on_full_or_empty,
+               farbot::fifo_options::full_empty_failure_mode::
+                   overwrite_or_return_default>
+      mQueue{MaxNumItem};
+public:
+  bool try_enqueue(T const & item) {
+    return mQueue.push(std::move(item));
+  }
+  bool try_enqueue(T && item) {
+    return mQueue.push(std::move(item));
+  }
+  bool try_dequeue(T &item) {
+    return mQueue.pop(item);
+  }
+};
+
 // On earlier versions of compilers (especially clang) you cannot
 // rely on defaulted template template parameters working as intended
 // This overload explicitly has 1 template paramter which is what
 // `Logger` expects, it uses the default 512 from ReaderWriterQueue as
 // the hardcoded MaxBlockSize
 template <typename T> using rtlog_SPSC = moodycamel::ReaderWriterQueue<T, 512>;
+template <typename T> using rtlog_MPSC = rtlog::FarbotMPSCQueueWrapper<T, 512>;
 
 /**
  * @brief A logger class for logging messages.

test/test_rtlog.cpp

@@ -82,6 +82,21 @@ TEST(RtlogTest, BasicConstruction) {
   EXPECT_EQ(logger.PrintAndClearLogQueue(PrintMessage), 4);
 }
 
+TEST(RtlogTest, BasicConstructionMPSC) {
+  rtlog::Logger<ExampleLogData, MAX_NUM_LOG_MESSAGES, MAX_LOG_MESSAGE_LENGTH,
+                gSequenceNumber, rtlog::rtlog_MPSC>
+      logger;
+  logger.Log({ExampleLogLevel::Debug, ExampleLogRegion::Engine},
+             "Hello, world!");
+  logger.Log({ExampleLogLevel::Info, ExampleLogRegion::Game}, "Hello, world!");
+  logger.Log({ExampleLogLevel::Warning, ExampleLogRegion::Network},
+             "Hello, world!");
+  logger.Log({ExampleLogLevel::Critical, ExampleLogRegion::Audio},
+             "Hello, world!");
+
+  EXPECT_EQ(logger.PrintAndClearLogQueue(PrintMessage), 4);
+}
+
 TEST(RtlogTest, VaArgsWorksAsIntended) {
   rtlog::Logger<ExampleLogData, MAX_NUM_LOG_MESSAGES, MAX_LOG_MESSAGE_LENGTH,
                 gSequenceNumber>