From 1893127e8468e67e0cc5ccd7ffcda8686d441490 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Fri, 28 Feb 2020 14:05:51 -0500
Subject: [PATCH] use fold expression if C++17

---
 libi2pd/Log.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libi2pd/Log.h b/libi2pd/Log.h
index b11c6763..ba10b5e9 100644
--- a/libi2pd/Log.h
+++ b/libi2pd/Log.h
@@ -161,6 +161,7 @@ void LogPrint (std::stringstream& s, TValue&& arg) noexcept
 	s << std::forward<TValue>(arg);
 }
 
+#if (__cplusplus < 201703L) // below C++ 17
 /** internal usage only -- folding args array to single string */
 template<typename TValue, typename... TArgs>
 void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
@@ -168,6 +169,7 @@ void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
 	LogPrint (s, std::forward<TValue>(arg));
 	LogPrint (s, std::forward<TArgs>(args)...);
 }
+#endif
 
 /**
  * @brief Create log message and send it to queue
@@ -184,7 +186,11 @@ void LogPrint (LogLevel level, TArgs&&... args) noexcept
 	// fold message to single string
 	std::stringstream ss("");
 
+#if (__cplusplus >= 201703L) // C++ 17 or higher
+	(LogPrint (ss, std::forward<TArgs>(args)), ...);
+#else
 	LogPrint (ss, std::forward<TArgs>(args)...);
+#endif
 
 	auto msg = std::make_shared<i2p::log::LogMsg>(level, std::time(nullptr), ss.str());
 	msg->tid = std::this_thread::get_id();