add wostream overloads for Timestamp operator<<

Author: edgchen1

include/onnxruntime/core/common/logging/logging.h

@@ -69,8 +69,13 @@ class Timestamp {
     return time_stamp.WriteToStream(os);
   }
 
+  friend std::wostream& operator<<(std::wostream& os, const Timestamp& time_stamp) {
+    return time_stamp.WriteToWStream(os);
+  }
+
  private:
   std::ostream& WriteToStream(std::ostream& os) const;
+  std::wostream& WriteToWStream(std::wostream& os) const;
 
   TimePoint time_point_{};
 };

onnxruntime/core/common/logging/logging.cc

@@ -71,6 +71,10 @@ std::ostream& Timestamp::WriteToStream(std::ostream& os) const {
   return timestamp_stream_insertion_op_ns::operator<<(os, time_point_);
 }
 
+std::wostream& Timestamp::WriteToWStream(std::wostream& os) const {
+  return timestamp_stream_insertion_op_ns::operator<<(os, time_point_);
+}
+
 const char* Category::onnxruntime = "onnxruntime";
 const char* Category::System = "System";
 

onnxruntime/core/common/logging/sinks/ostream_sink.cc

@@ -62,9 +62,6 @@ void OStreamSink::SendImpl(const Timestamp& timestamp, const std::string& logger
 }
 #else
 void WOStreamSink::SendImpl(const Timestamp& timestamp, const std::string& logger_id, const Capture& message) {
-  // operator for formatting of timestamp in ISO8601 format including microseconds
-  using date::operator<<;
-
   // Two options as there may be multiple calls attempting to write to the same sink at once:
   // 1) Use mutex to synchronize access to the stream.
   // 2) Create the message in an ostringstream and output in one call.

onnxruntime/core/session/inference_session.cc

@@ -113,7 +113,7 @@ inline const wchar_t* GetDateFormatString<wchar_t>() {
   return L"%Y-%m-%d_%H-%M-%S";
 }
 #endif
-// TODO: use LoggingManager::GetTimestamp and date::operator<<
+// TODO: use LoggingManager::GetTimestamp and operator<<
 // (see ostream_sink.cc for an example)
 // to simplify this and match the log file timestamp format.
 template <typename T>