common: added MultiVersion template.

libs/libcommon/src/tests/multi_version.cpp

@@ -0,0 +1,55 @@
+#include <string.h>
+#include <iostream>
+#include <statdaemons/threadpool.hpp>
+#include <boost/bind.hpp>
+#include <Yandex/MultiVersion.h>
+
+
+typedef std::string T;
+typedef Yandex::MultiVersion<T> MV;
+typedef std::vector<T> Results;
+
+
+void thread1(MV & x, T & result)
+{
+	MV::Version v = x.get();
+	result = *v;
+}
+
+void thread2(MV & x, const char * result)
+{
+	x.set(new T(result));
+}
+
+
+int main(int argc, char ** argv)
+{
+	try
+	{
+		const char * s1 = "Hello!";
+		const char * s2 = "Goodbye!";
+		
+		size_t n = 1000;
+		MV x(new T(s1));
+		Results results(n);
+
+		boost::threadpool::pool tp(8);
+		for (size_t i = 0; i < n; ++i)
+		{
+			tp.schedule(boost::bind(thread1, boost::ref(x), boost::ref(results[i])));
+			tp.schedule(boost::bind(thread2, boost::ref(x), (rand() % 2) ? s1 : s2));
+		}
+		tp.wait();
+
+		for (size_t i = 0; i < n; ++i)
+			std::cerr << results[i] << " ";
+		std::cerr << std::endl;
+	}
+	catch (const Poco::Exception & e)
+	{
+		std::cerr << e.message() << std::endl;
+		throw;
+	}
+	
+	return 0;
+}