Precommit (#1)

* first commit

* cleanup

global/trace.h

@@ -0,0 +1,77 @@
+#ifndef TRACE_H
+#define TRACE_H
+
+#include <chrono>
+#include <ctime>
+#include <sstream>
+#include <iomanip>
+#ifdef __GNUC__
+#include <unistd.h>
+#endif
+
+#ifndef ENABLE_TRACE
+/**
+ * @brief Enable the trace macro by setting to a non-zero value.
+ */
+#define ENABLE_TRACE 0
+#endif
+
+/**
+* @brief Return the current time as a string.
+* @return The current time.
+*/
+inline std::string GetTimestamp()
+{
+    const auto current_time_point {std::chrono::system_clock::now()};
+    const auto current_time {std::chrono::system_clock::to_time_t(current_time_point)};
+    const auto current_localtime {*std::localtime (&current_time)};
+    const auto current_time_since_epoch {current_time_point.time_since_epoch()};
+    const auto current_milliseconds {std::chrono::duration_cast<std::chrono::milliseconds> (current_time_since_epoch).count() % 1000};
+
+    std::ostringstream stream;
+    stream << "PID#" << std::dec << getpid() << " " << std::put_time(&current_localtime, "%H:%M:%S") << "." << std::setw(3) << std::setfill('0') << current_milliseconds << ": ";
+    return stream.str();
+}
+
+#include <cstring>
+#include <iostream>
+
+#if ENABLE_TRACE != 0
+
+#ifdef _MSC_VER
+#define TRACE(...) Trace(GetTimestamp(), __FUNCTION__, ": ", __VA_ARGS__)
+#elif defined __GNUC__
+#define TRACE(...) Trace(GetTimestamp(), __PRETTY_FUNCTION__, ": ", ##__VA_ARGS__)
+#else
+#error Other compiler are not supported.
+#endif
+
+inline void Trace(std::stringstream& /*rsstream*/)
+{}
+
+template <typename TArg, typename... TArgs>
+inline void Trace(std::stringstream& rsstream, TArg tArg, TArgs... tArgs)
+{
+    rsstream << tArg;
+    Trace(rsstream, tArgs...);
+}
+
+template <typename... TArgs>
+inline void Trace(TArgs... tArgs)
+{
+    std::stringstream sstream;
+    Trace(sstream, tArgs...);
+    sstream << std::endl;
+    std::cout << sstream.str();
+}
+
+#else // ENABLE_TRACE == 0
+inline void Trace()
+{}
+
+#ifdef __GNUC__
+#endif
+#define TRACE(...) Trace()
+#endif
+
+#endif // !defined TRACE_H