diff --git a/example/bench.cpp b/example/bench.cpp
index f3e19d7e..988e2d21 100644
--- a/example/bench.cpp
+++ b/example/bench.cpp
@@ -17,27 +17,23 @@ using namespace utils;
 
 int main(int argc, char* argv[])
 {
-    const unsigned int howmany = argc <= 1 ? 500000 : atoi(argv[1]);
+    const unsigned int howmany = argc <= 1 ? 1000000 : atoi(argv[1]);
 
-    std::string pattern = "%Y:%m:%d %H:%M:%S.%e [%n:%l] %t";
-    auto formatter1 = std::unique_ptr<formatter>(new details::pattern_formatter(pattern));
+    //std::string pattern = "%Y:%m:%d %H:%M:%S.%e ---> [%n:%l] %t";
+    //auto formatter = std::make_shared<details::pattern_formatter>(pattern);
 
-    logger cout_logger("bench",  std::make_shared<sinks::stderr_sink_mt>() , std::move(formatter1));
-    cout_logger.info() << "Hello logger";
+    logger cout_logger("bench", { std::make_shared<sinks::stderr_sink_mt>() });
+    cout_logger.info() << "Hello logger " << std::setw(10) << std::setfill('x') << 1234.55;
 
-    auto nullsink = std::make_shared<sinks::null_sink<details::null_mutex>>();
+    auto nullsink = std::make_shared<sinks::null_sink_st>();
     auto rotating = std::make_shared<sinks::rotating_file_sink_mt>("myrotating", "txt", 1024 * 1024 * 5, 5, 100);
 
-
-    auto formatter2 = std::unique_ptr<formatter>(new details::pattern_formatter(pattern));
-    logger my_logger("my_logger", rotating, std::move(formatter2));
+    logger my_logger("my_logger", { nullsink });
 
     auto start = system_clock::now();
     for (unsigned int i = 1; i <= howmany; ++i)
         my_logger.info() << "Hello logger: msg #" << i;
 
-
-
     auto delta = system_clock::now() - start;
     auto delta_d = duration_cast<duration<double>> (delta).count();
 
diff --git a/example/example.cpp b/example/example.cpp
index c00f868e..465dd630 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -9,7 +9,7 @@
 #include "c11log/sinks/file_sinks.h"
 using namespace std;
 
-int main(int, char* [])
+int main2(int, char* [])
 {
 
     auto console = c11log::factory::stdout_logger();
diff --git a/include/c11log/details/fast_istostr.h b/include/c11log/details/fast_istostr.h
index 3221962d..50f2ad35 100644
--- a/include/c11log/details/fast_istostr.h
+++ b/include/c11log/details/fast_istostr.h
@@ -3,7 +3,7 @@
 
 //Fast to int to string
 //Source: http://stackoverflow.com/a/4351484/192001
-//Modified version to pad zeros according to min_size
+//Modified version to pad zeros according to padding arg
 
 namespace c11log {
 namespace details {
diff --git a/include/c11log/details/fast_oss.h b/include/c11log/details/fast_oss.h
index 121f0310..9744fb24 100644
--- a/include/c11log/details/fast_oss.h
+++ b/include/c11log/details/fast_oss.h
@@ -105,21 +105,21 @@ public:
         _dev.clear();
     }
 
-    // The following were added because they add significant boost to perfromance
+    //
+    // The following were added because they significantly boost to perfromance
+    //
     void putc(char c)
     {
         _dev.sputc(c);
+        this->width(4);
     }
 
-
     // put int and pad with zeroes if smalled than min_width
-    void put_int(int n, int min_width)
+    void put_int(int n, int padding)
     {
         std::string s;
-        details::fast_itostr(n, s, min_width);
+        details::fast_itostr(n, s, padding);
         _dev.sputn(s.data(), s.size());
-        //sprintf_s(buf, "%d", n);
-        //_dev.sputn(buf, width);
     }
 
     void put_str(const std::string& s)
diff --git a/include/c11log/details/pattern_formatter.h b/include/c11log/details/pattern_formatter.h
index 22041d80..58e932d0 100644
--- a/include/c11log/details/pattern_formatter.h
+++ b/include/c11log/details/pattern_formatter.h
@@ -8,19 +8,20 @@
 #include "../formatter.h"
 #include "log_msg.h"
 #include "fast_oss.h"
+#include "os.h"
 
 
 namespace c11log
 {
 namespace details {
-class pattern_appender
+class pattern_compiler
 {
 public:
     virtual void append(const details::log_msg& msg, details::fast_oss& oss) = 0;
 };
 
 // log name appender
-class name_appender :public pattern_appender
+class name_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -29,7 +30,7 @@ class name_appender :public pattern_appender
 };
 
 // log level appender
-class level_appender :public pattern_appender
+class level_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -42,7 +43,7 @@ class level_appender :public pattern_appender
 ///////////////////////////////////////////////////////////////////////
 
 // year - 4 digit
-class Y_appender :public pattern_appender
+class Y_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -51,7 +52,7 @@ class Y_appender :public pattern_appender
 };
 
 // year - 2 digit
-class y_appender :public pattern_appender
+class y_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -59,7 +60,7 @@ class y_appender :public pattern_appender
     }
 };
 // month 1-12
-class m_appender :public pattern_appender
+class m_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -67,9 +68,8 @@ class m_appender :public pattern_appender
     }
 };
 
-
 // day of month 1-31
-class d_appender :public pattern_appender
+class d_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -78,7 +78,7 @@ class d_appender :public pattern_appender
 };
 
 // hours in 24 format  0-23
-class H_appender :public pattern_appender
+class H_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -87,7 +87,7 @@ class H_appender :public pattern_appender
 };
 
 // hours in 12 format  1-12
-class I_appender :public pattern_appender
+class I_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -96,7 +96,7 @@ class I_appender :public pattern_appender
 };
 
 // ninutes 0-59
-class M_appender :public pattern_appender
+class M_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -105,7 +105,7 @@ class M_appender :public pattern_appender
 };
 
 // seconds 0-59
-class S_appender :public pattern_appender
+class S_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -114,7 +114,7 @@ class S_appender :public pattern_appender
 };
 
 // milliseconds
-class e_appender :public pattern_appender
+class e_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -125,7 +125,7 @@ class e_appender :public pattern_appender
 };
 
 
-class t_appender :public pattern_appender
+class t_compiler :public pattern_compiler
 {
     void append(const details::log_msg& msg, details::fast_oss& oss) override
     {
@@ -133,10 +133,10 @@ class t_appender :public pattern_appender
     }
 };
 
-class ch_appender :public pattern_appender
+class ch_compiler :public pattern_compiler
 {
 public:
-    explicit ch_appender(char ch) : _ch(ch)
+    explicit ch_compiler(char ch) : _ch(ch)
     {}
     void append(const details::log_msg&, details::fast_oss& oss) override
     {
@@ -147,10 +147,10 @@ private:
 };
 
 
-class str_appender :public pattern_appender
+class str_compiler :public pattern_compiler
 {
 public:
-    str_appender()
+    str_compiler()
     {}
     void add_ch(char ch)
     {
@@ -175,7 +175,7 @@ public:
     void format(details::log_msg& msg) override;
 private:
     const std::string _pattern;
-    std::vector<std::unique_ptr<details::pattern_appender>> _appenders;
+    std::vector<std::unique_ptr<details::pattern_compiler>> _compilers;
     void handle_flag(char flag);
     void compile_pattern(const std::string& pattern);
 };
@@ -204,7 +204,7 @@ inline void c11log::details::pattern_formatter::compile_pattern(const std::strin
         else
         {
             // chars not following the % sign should be displayed as is
-            _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::ch_appender(*it)));
+            _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::ch_compiler(*it)));
         }
     }
 
@@ -215,66 +215,65 @@ inline void c11log::details::pattern_formatter::handle_flag(char flag)
     {
     // logger name
     case 'n':
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::name_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::name_compiler()));
         break;
     // message log level
     case 'l':
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::level_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::level_compiler()));
         break;
     // message text
     case('t') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::t_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::t_compiler()));
         break;
     // year
     case('Y') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::Y_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::Y_compiler()));
         break;
     // year 2 digits
     case('y') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::y_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::y_compiler()));
         break;
     // month
     case('m') :
         // minute
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::m_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::m_compiler()));
         break;
     // day in month
     case('d') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::d_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::d_compiler()));
         break;
     // hour (24)
     case('H') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::H_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::H_compiler()));
         break;
     // hour (12)
     case('I') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::I_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::I_compiler()));
         break;
     // minutes
     case('M') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::M_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::M_compiler()));
         break;
     // seconds
     case('S') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::S_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::S_compiler()));
         break;
     // milliseconds part
     case('e'):
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::e_appender()));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::e_compiler()));
         break;
     // % sign
     case('%') :
-        _appenders.push_back(std::unique_ptr<details::pattern_appender>(new details::ch_appender('%')));
+        _compilers.push_back(std::unique_ptr<details::pattern_compiler>(new details::ch_compiler('%')));
         break;
     }
-
 }
 
 
 inline void c11log::details::pattern_formatter::format(details::log_msg& msg)
 {
     details::fast_oss oss;
-    for (auto &appender : _appenders)
+    for (auto &appender : _compilers)
     {
         appender->append(msg, oss);
     }
diff --git a/include/c11log/factory.h b/include/c11log/factory.h
index dfca8bf3..309a7098 100644
--- a/include/c11log/factory.h
+++ b/include/c11log/factory.h
@@ -18,13 +18,13 @@ namespace factory
 std::unique_ptr<logger> stdout_logger(const std::string& name = "")
 {
     auto sink = std::make_shared<sinks::stderr_sink_st>();
-    return std::unique_ptr<logger>(new logger(name, sink));
+    return std::unique_ptr<logger>(new logger(name, { sink }));
 }
 
 std::unique_ptr<logger> stdout_logger_mt(const std::string& name = "")
 {
     auto sink = std::make_shared<sinks::stderr_sink_mt>();
-    return std::unique_ptr<logger>(new logger(name, sink));
+    return std::unique_ptr<logger>(new logger(name, { sink }));
 }
 
 //
@@ -33,13 +33,13 @@ std::unique_ptr<logger> stdout_logger_mt(const std::string& name = "")
 std::unique_ptr<logger> simple_file_logger(const std::string& filename, const std::string& logger_name = "" )
 {
     auto fsink = std::make_shared<sinks::simple_file_sink_st>(filename);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 
 }
 std::unique_ptr<logger> simple_file_logger_mt(const std::string& filename, const std::string& logger_name = "")
 {
     auto fsink = std::make_shared<sinks::simple_file_sink_mt>(filename);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 }
 
 //
@@ -52,7 +52,7 @@ std::unique_ptr<logger> daily_file_logger(
     const std::string& logger_name = "")
 {
     auto fsink = std::make_shared<sinks::daily_file_sink_st>(filename, extension, flush_every);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 }
 
 std::unique_ptr<logger> daily_file_logger_mt(
@@ -62,7 +62,7 @@ std::unique_ptr<logger> daily_file_logger_mt(
     const std::string& logger_name = "")
 {
     auto fsink = std::make_shared<sinks::daily_file_sink_mt>(filename, extension, flush_every);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 }
 
 //
@@ -77,7 +77,7 @@ std::unique_ptr<logger> rotating_file_logger(
     const std::string& logger_name = "")
 {
     auto fsink = std::make_shared<sinks::rotating_file_sink_st>(filename, extension, max_size, max_files, flush_every);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 }
 
 std::unique_ptr<logger> rotating_file_logger_mt(
@@ -89,7 +89,7 @@ std::unique_ptr<logger> rotating_file_logger_mt(
     const std::string& logger_name = "")
 {
     auto fsink = std::make_shared<sinks::rotating_file_sink_mt>(filename, extension, max_size, max_files, flush_every);
-    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, { fsink }));
 }
 } // ns factory
 } // ns c11log
diff --git a/include/c11log/formatter.h b/include/c11log/formatter.h
index cea5c920..f7b2b5fd 100644
--- a/include/c11log/formatter.h
+++ b/include/c11log/formatter.h
@@ -1,19 +1,5 @@
 #pragma once
-
-#include <string>
-#include <chrono>
-
-#include <iomanip>
-#include <thread>
-#include <cstring>
-#include <sstream>
-
-#include "common.h"
-#include "details/os.h"
 #include "details/log_msg.h"
-#include "details/fast_oss.h"
-
-
 namespace c11log
 {
 
diff --git a/include/c11log/logger.h b/include/c11log/logger.h
index abf523f8..14c6d7c8 100644
--- a/include/c11log/logger.h
+++ b/include/c11log/logger.h
@@ -29,15 +29,11 @@ class logger
 {
 public:
     using sink_ptr = std::shared_ptr<sinks::sink>;
-    using sinks_vector_t = std::vector<sink_ptr>;
-    using sinks_init_list = std::initializer_list<sink_ptr>;
-    using formatter_ptr = std::unique_ptr<formatter>;
+    using formatter_ptr = std::shared_ptr<formatter>;
 
-    logger(const std::string& name, sinks_init_list, formatter_ptr = nullptr);
+    logger(const std::string& name, std::initializer_list<sink_ptr>, formatter_ptr formatter = nullptr);
     template<class It>
-    logger(const std::string& name, It begin, It end, formatter_ptr = nullptr);
-    logger(const std::string& name, sink_ptr, formatter_ptr = nullptr);
-    ~logger() = default;
+    logger(const std::string& name, const It& begin, const It& end);
 
     logger(const logger&) = delete;
     logger& operator=(const logger&) = delete;
@@ -48,6 +44,9 @@ public:
     const std::string& name() const;
     bool should_log(level::level_enum) const;
 
+    void formatter(formatter_ptr);
+    formatter_ptr formatter() const;
+
 
     template <typename... Args> details::line_logger log(level::level_enum lvl, const Args&... args);
     template <typename... Args> details::line_logger trace(const Args&... args);
@@ -57,20 +56,18 @@ public:
     template <typename... Args> details::line_logger error(const Args&... args);
     template <typename... Args> details::line_logger critical(const Args&... args);
 
-
-
-
 private:
     friend details::line_logger;
     std::string _name;
     formatter_ptr _formatter;
-    sinks_vector_t _sinks;
+    std::vector<sink_ptr> _sinks;
     std::atomic_int _level;
-
     void _variadic_log(details::line_logger& l);
     template <typename First, typename... Rest>
     void _variadic_log(details::line_logger&l, const First& first, const Rest&... rest);
     void _log_msg(details::log_msg& msg);
+    formatter_ptr  _default_formatter();
+    const char* _default_pattern = "[%Y:%m:%d %H:%M:%S.%e] [%n:%l] %t";
 
 
 };
@@ -98,30 +95,24 @@ private:
 #include "details/line_logger.h"
 
 
-inline c11log::logger::logger(const std::string& logger_name, sinks_init_list sinks_list, formatter_ptr f) :
+inline c11log::logger::logger(const std::string& logger_name, std::initializer_list<sink_ptr> sinks_list, formatter_ptr formatter) :
     _name(logger_name),
-    _formatter(std::move(f)),
+    _formatter(formatter),
     _sinks(sinks_list)
 {
-    //Seems that vs2013 doesn't support std::atomic member initialization yet
+    if (!formatter) //default formatter
+        _formatter = std::make_shared<details::pattern_formatter>(_default_pattern);
+
+    //Seems that vs2013 doesn't support atomic member initialization yet
     _level = level::INFO;
-    if(!_formatter)
-        _formatter = formatter_ptr(new details::pattern_formatter("%t"));
 
 }
 
 template<class It>
-inline c11log::logger::logger(const std::string& logger_name, It begin, It end, formatter_ptr f):
+inline c11log::logger::logger(const std::string& logger_name, const It& begin, const It& end):
     _name(logger_name),
-    _formatter(std::move(f)),
     _sinks(begin, end)
-{
-
-}
-
-inline c11log::logger::logger(const std::string& logger_name, sink_ptr sink, formatter_ptr f) :
-    logger(logger_name, {sink}, std::move(f)) {}
-
+{}
 
 template <typename... Args>
 inline c11log::details::line_logger c11log::logger::log(level::level_enum lvl, const Args&... args) {
@@ -130,35 +121,36 @@ inline c11log::details::line_logger c11log::logger::log(level::level_enum lvl, c
     return l;
 }
 
-
 template <typename... Args>
-inline c11log::details::line_logger c11log::logger::trace(const Args&... args) {
+inline c11log::details::line_logger c11log::logger::trace(const Args&... args)
+{
     return log(level::TRACE, args...);
 }
 
 template <typename... Args>
-inline c11log::details::line_logger c11log::logger::debug(const Args&... args) {
+inline c11log::details::line_logger c11log::logger::debug(const Args&... args)
+{
     return log(level::DEBUG, args...);
 }
 
 template <typename... Args>
-inline c11log::details::line_logger c11log::logger::info(const Args&... args) {
+inline c11log::details::line_logger c11log::logger::info(const Args&... args)
+{
     return log(level::INFO, args...);
 }
 
-
 template <typename... Args>
-inline c11log::details::line_logger c11log::logger::warn(const Args&... args) {
+inline c11log::details::line_logger c11log::logger::warn(const Args&... args)
+{
     return log(level::WARNING, args...);
 }
 
 template <typename... Args>
-inline c11log::details::line_logger c11log::logger::critical(const Args&... args) {
+inline c11log::details::line_logger c11log::logger::critical(const Args&... args)
+{
     return log(level::CRITICAL, args...);
 }
 
-
-
 inline const std::string& c11log::logger::name() const
 {
     return _name;
@@ -180,6 +172,18 @@ inline bool c11log::logger::should_log(c11log::level::level_enum msg_level) cons
 }
 
 
+inline void c11log::logger::formatter(formatter_ptr formatter)
+{
+    _formatter = formatter;
+}
+
+inline c11log::logger::formatter_ptr c11log::logger::formatter() const
+{
+    return _formatter;
+}
+
+
+
 inline void c11log::logger::_variadic_log(c11log::details::line_logger&) {}
 
 template <typename First, typename... Rest>
diff --git a/include/c11log/sinks/async_sink.h b/include/c11log/sinks/async_sink.h
index 8860f88d..48a1abfa 100644
--- a/include/c11log/sinks/async_sink.h
+++ b/include/c11log/sinks/async_sink.h
@@ -39,7 +39,7 @@ protected:
     void _thread_loop();
 
 private:
-    c11log::logger::sinks_vector_t _sinks;
+    std::vector<std::shared_ptr<sink>> _sinks;
     std::atomic<bool> _active;
     q_type _q;
     std::thread _back_thread;
diff --git a/include/c11log/sinks/null_sink.h b/include/c11log/sinks/null_sink.h
index 4526eef6..30c62714 100644
--- a/include/c11log/sinks/null_sink.h
+++ b/include/c11log/sinks/null_sink.h
@@ -1,6 +1,8 @@
 #pragma once
-
+#include <mutex>
 #include "base_sink.h"
+#include "../details/null_mutex.h"
+
 
 namespace c11log {
 namespace sinks {
@@ -13,6 +15,9 @@ protected:
     {}
 };
 
+typedef null_sink<details::null_mutex> null_sink_st;
+typedef null_sink<std::mutex> null_sink_mt;
+
 }
 }