add wide string to utf8 string support

include/spdlog/details/logger_impl.h

@@ -296,3 +296,61 @@ inline const std::vector<spdlog::sink_ptr>& spdlog::logger::sinks() const
 {
     return _sinks;
 }
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+#include <codecvt>
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const wchar_t* msg)
+{
+	std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
+
+	log(lvl, conv.to_bytes(msg));
+}
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const wchar_t* fmt, const Args&... args)
+{
+	fmt::WMemoryWriter wWriter;
+
+	wWriter.write(fmt, args...);
+	log(lvl, wWriter.c_str());
+}
+
+template <typename... Args>
+inline void spdlog::logger::trace(const wchar_t* fmt, const Args&... args)
+{
+	log(level::trace, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::debug(const wchar_t* fmt, const Args&... args)
+{
+	log(level::debug, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::info(const wchar_t* fmt, const Args&... args)
+{
+	log(level::info, fmt, args...);
+}
+
+
+template <typename... Args>
+inline void spdlog::logger::warn(const wchar_t* fmt, const Args&... args)
+{
+	log(level::warn, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::error(const wchar_t* fmt, const Args&... args)
+{
+	log(level::err, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::critical(const wchar_t* fmt, const Args&... args)
+{
+	log(level::critical, fmt, args...);
+}
+#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT

include/spdlog/logger.h

@@ -69,7 +69,16 @@ public:
     virtual void flush();
 
     const std::vector<sink_ptr>& sinks() const;
-
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+	template <typename... Args> void log(level::level_enum lvl, const wchar_t* msg);
+	template <typename... Args> void log(level::level_enum lvl, const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void trace(const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void debug(const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void info(const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void warn(const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void error(const wchar_t* fmt, const Args&... args);
+	template <typename... Args> void critical(const wchar_t* fmt, const Args&... args);
+#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
 protected:
     virtual void _sink_it(details::log_msg&);
     virtual void _set_pattern(const std::string&);

include/spdlog/tweakme.h

@@ -106,3 +106,10 @@
 //
 // #define SPDLOG_PREVENT_CHILD_FD
 ///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable wchar_t support (convert to utf8)
+//
+// #define SPDLOG_WCHAR_TO_UTF8_SUPPORT
+///////////////////////////////////////////////////////////////////////////////