support set_formatter in spdlog.h

include/spdlog/details/logger_impl.h

@@ -37,19 +37,18 @@ inline spdlog::logger::logger(std::string logger_name, spdlog::sink_ptr single_s
 
 inline spdlog::logger::~logger() = default;
 
-template<typename FormatterT, typename... Args>
-inline void spdlog::logger::set_formatter(const Args &... args)
+
+inline void spdlog::logger::set_formatter(std::unique_ptr<spdlog::formatter> f)
 {
 	for (auto &sink : sinks_)
 	{
-        std::unique_ptr<FormatterT> formatter(new FormatterT(args...));
-        sink->set_formatter(std::move(formatter));
+		sink->set_formatter(f->clone());
 	}
 }
 
 inline void spdlog::logger::set_pattern(std::string pattern, pattern_time_type time_type)
 {
-    set_formatter<spdlog::pattern_formatter>(std::move(pattern), time_type);
+    set_formatter(std::unique_ptr<spdlog::formatter>(new pattern_formatter(std::move(pattern), time_type)));
 }
 
 template<typename... Args>

include/spdlog/details/pattern_formatter.h

@@ -543,16 +543,23 @@ class pattern_formatter SPDLOG_FINAL : public formatter
 public:
 	explicit pattern_formatter(
 		std::string pattern, pattern_time_type time_type = pattern_time_type::local, std::string eol = spdlog::details::os::default_eol)
-        : eol_(std::move(eol))
+		: pattern_(std::move(pattern))
+		, eol_(std::move(eol))
 		, pattern_time_type_(time_type)
 		, last_log_secs_(0)
 	{
 		std::memset(&cached_tm_, 0, sizeof(cached_tm_));
-        compile_pattern_(std::move(pattern));
+		compile_pattern_(pattern_);
+	}
+
+	pattern_formatter(const pattern_formatter &other) = delete;	
+	pattern_formatter &operator=(const pattern_formatter &other) = delete;
+	
+	virtual std::unique_ptr<formatter> clone() const override
+	{
+		return std::unique_ptr<formatter>(new pattern_formatter(pattern_, pattern_time_type_, eol_));
 	}
 
-    pattern_formatter(const pattern_formatter &) = delete;
-    pattern_formatter &operator=(const pattern_formatter &) = delete;
     void format(const details::log_msg &msg, fmt::memory_buffer &dest) override
     {
 #ifndef SPDLOG_NO_DATETIME
@@ -572,7 +579,8 @@ public:
     }
 
 private:
-    const std::string eol_;
+	std::string pattern_;
+    std::string eol_;
     pattern_time_type pattern_time_type_;
     std::tm cached_tm_;
     std::chrono::seconds last_log_secs_;
@@ -737,6 +745,7 @@ private:
     {		
         auto end = pattern.end();
         std::unique_ptr<details::aggregate_formatter> user_chars;
+		formatters_.clear();
         for (auto it = pattern.begin(); it != end; ++it)
         {
             if (*it == '%')

include/spdlog/details/registry.h

@@ -48,7 +48,7 @@ public:
         throw_if_exists_(logger_name);
 
         // set the global formatter pattern
-        new_logger->set_formatter<pattern_formatter>(formatter_pattern_, pattern_time_type_);
+        new_logger->set_formatter(formatter_->clone());
 
         if (err_handler_)
         {
@@ -81,14 +81,15 @@ public:
         return tp_;
     }
 
-    void set_pattern(const std::string &pattern, pattern_time_type time_type)
+    
+	// Set global formatter. Each sink in each logger will get a clone of this object
+	void set_formatter(std::unique_ptr<formatter> formatter)	
 	{
 		std::lock_guard<Mutex> lock(loggers_mutex_);		
-        formatter_pattern_ = pattern;
-        pattern_time_type_ = time_type;
+		formatter_ = std::move(formatter);
 		for (auto &l : loggers_)
 		{
-            l.second->set_pattern(pattern, time_type);
+			l.second->set_formatter(formatter_->clone());
 		}
 	}
 
@@ -195,8 +196,7 @@ private:
     Mutex loggers_mutex_;
     std::recursive_mutex tp_mutex_;
     std::unordered_map<std::string, std::shared_ptr<logger>> loggers_;
-    std::string formatter_pattern_ = "%+";
-    pattern_time_type pattern_time_type_ = pattern_time_type::local;
+	std::unique_ptr<formatter> formatter_{ new pattern_formatter("%+") };    
     level::level_enum level_ = level::info;
     level::level_enum flush_level_ = level::off;
     log_err_handler err_handler_;

include/spdlog/formatter.h

@@ -15,5 +15,6 @@ class formatter
 public:
     virtual ~formatter() = default;
     virtual void format(const details::log_msg &msg, fmt::memory_buffer &dest) = 0;
+	virtual std::unique_ptr<formatter> clone() const = 0;
 };
 } // namespace spdlog

include/spdlog/logger.h

@@ -115,15 +115,11 @@ public:
     level::level_enum level() const;
     const std::string &name() const;
     
-    // create a pattern formatter all the sinks in this logger.
-    // each sink gets itw own private copy of a formatter object.
+	// set formatting for the sinks in this logger.
+	// each sink will get a seperate instance of the formatter object.
+	void set_formatter(std::unique_ptr<formatter> formatter);
     void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);		
 	
-    // create a FormatterT formatter for each sink in this logger.
-    // each sink gets its own private copy of a formatter object.
-    template<typename FormatterT, typename... Args>
-    void set_formatter(const Args &... args);
-
     void flush();
     void flush_on(level::level_enum log_level);
 
@@ -131,7 +127,6 @@ public:
 
     std::vector<sink_ptr> &sinks();
    
-    // error handler
     void set_error_handler(log_err_handler err_handler);
     log_err_handler error_handler();
 

include/spdlog/spdlog.h

@@ -38,8 +38,7 @@ using default_factory = synchronous_factory;
 // The logger's level, formatter and flush level will be set according the
 // global settings.
 // Example:
-// spdlog::create<daily_file_sink_st>("logger_name", "dailylog_filename", 11,
-// 59);
+// spdlog::create<daily_file_sink_st>("logger_name", "dailylog_filename", 11, 59);
 template<typename Sink, typename... SinkArgs>
 inline std::shared_ptr<spdlog::logger> create(std::string logger_name, SinkArgs &&... sink_args)
 {
@@ -54,11 +53,17 @@ inline std::shared_ptr<logger> get(const std::string &name)
     return details::registry::instance().get(name);
 }
 
-// Set global formatting
-// example: spdlog::set_pattern("%Y-%m-%d %H:%M:%S.%e %l : %v");
-inline void set_pattern(std::string format_string, pattern_time_type time_type = pattern_time_type::local)
+// Set global formatter. Each sink in each logger will get a clone of this object
+inline void set_formatter(std::unique_ptr<spdlog::formatter> formatter)
 {
-    details::registry::instance().set_pattern(std::move(format_string), time_type);
+	details::registry::instance().set_formatter(std::move(formatter));
+}
+
+// Set global format string. 
+// example: spdlog::set_pattern("%Y-%m-%d %H:%M:%S.%e %l : %v");
+inline void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local)
+{
+	set_formatter(std::unique_ptr<spdlog::formatter>(new pattern_formatter(pattern, time_type)));
 }
 
 // Set global logging level

tests/test_pattern_formatter.cpp

@@ -9,7 +9,8 @@ static std::string log_to_str(const std::string &msg, const Args &... args)
     auto oss_sink = std::make_shared<spdlog::sinks::ostream_sink_mt>(oss);
     spdlog::logger oss_logger("pattern_tester", oss_sink);
     oss_logger.set_level(spdlog::level::info);
-    oss_logger.set_formatter<spdlog::pattern_formatter>(args...);
+
+	oss_logger.set_formatter(std::unique_ptr<spdlog::formatter>(new spdlog::pattern_formatter(args...)));
 
     oss_logger.info(msg);
     return oss.str();