volatile varibles in favor of std::atmoc<>

source/detail/posix/msg_dispatcher.hpp

@@ -26,6 +26,7 @@
 #include <condition_variable>
 #include <memory>
 #include <thread>
+#include <atomic>
 
 namespace nana
 {
@@ -340,7 +341,7 @@ namespace detail
 
 	private:
 		Display * display_;
-		volatile bool is_work_{ false };
+		std::atomic<bool> is_work_{ false };
 		std::unique_ptr<std::thread> thrd_;
 
 		struct table_tag

source/detail/posix/platform_spec.hpp

@@ -20,6 +20,7 @@
 
 #include <nana/push_ignore_diagnostic>
 
+#include <atomic>
 #include <thread>
 #include <mutex>
 #include <memory>
@@ -268,7 +269,7 @@ namespace detail
 		std::recursive_mutex xlib_locker_;
 		struct caret_holder_tag
 		{
-			volatile bool exit_thread;
+			std::atomic<bool> exit_thread;
 			std::unique_ptr<std::thread> thr;
 			std::map<native_window_type, caret_rep*> carets;
 		}caret_holder_;

source/system/timepiece.cpp

@@ -24,7 +24,7 @@ namespace system
 			: impl_(new impl_t)
 		{}
 
-		timepiece::timepiece(const volatile timepiece& rhs)
+		timepiece::timepiece(const timepiece& rhs)
 			: impl_(new impl_t(*rhs.impl_))
 		{}
 
@@ -33,7 +33,7 @@ namespace system
 			delete impl_;
 		}
 
-		timepiece & timepiece::operator=(const volatile timepiece & rhs)
+		timepiece & timepiece::operator=(const timepiece & rhs)
 		{
 			if(this != &rhs)
 				*impl_ = *rhs.impl_;
@@ -41,7 +41,7 @@ namespace system
 			return *this;
 		}
 
-		void timepiece::start() volatile
+		void timepiece::start() noexcept
 		{
 #if defined(NANA_WINDOWS)
 			::QueryPerformanceCounter(&impl_->beg_timestamp);
@@ -51,7 +51,7 @@ namespace system
 #endif
 		}
 
-		double timepiece::calc() const volatile
+		double timepiece::calc() const noexcept
 		{
 #if defined(NANA_WINDOWS)
 			LARGE_INTEGER li;