1 files changed, 0 insertions, 131 deletions
diff --git a/std_call_once_bug/sample.cpp b/std_call_once_bug/sample.cpp
deleted file mode 100644
index 01b5092..0000000
--- a/std_call_once_bug/sample.cpp
+++ /dev/null
@@ -1,131 +0,0 @@
-// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
-// This file is part of the "Egor's blog" project.
-// For details, see https://github.com/egor-tensin/blog.
-// Distributed under the MIT License.
-
-#include <ctime>
-
-#include <chrono>
-#include <iostream>
-#include <mutex>
-#include <sstream>
-#include <string>
-#include <thread>
-
-namespace
-{
-    template <typename Derived>
-    class Singleton
-    {
-    public:
-        static Derived& get_instance()
-        {
-            std::call_once(initialized_flag, &initialize_instance);
-            return Derived::get_instance_unsafe();
-        }
-
-    protected:
-        Singleton() = default;
-        ~Singleton() = default;
-
-        static Derived& get_instance_unsafe()
-        {
-            static Derived instance;
-            return instance;
-        }
-
-    private:
-        static void initialize_instance()
-        {
-            Derived::get_instance_unsafe();
-        }
-
-        static std::once_flag initialized_flag;
-
-        Singleton(const Singleton&) = delete;
-        Singleton& operator=(const Singleton&) = delete;
-    };
-
-    template <typename Derived>
-    std::once_flag Singleton<Derived>::initialized_flag;
-
-    class Logger : public Singleton<Logger>
-    {
-    public:
-        Logger& operator<<(const char*)
-        {
-            return *this;
-        }
-
-    private:
-        Logger()
-        {
-            std::this_thread::sleep_for(std::chrono::seconds{3});
-        }
-
-        ~Logger() = default;
-
-        friend class Singleton<Logger>;
-    };
-
-    class Duke : public Singleton<Duke>
-    {
-    private:
-        Duke()
-        {
-            Logger::get_instance() << "started Duke's initialization";
-            std::this_thread::sleep_for(std::chrono::seconds{10});
-            Logger::get_instance() << "finishing Duke's initialization";
-        }
-
-        ~Duke() = default;
-
-        friend class Singleton<Duke>;
-    };
-
-    std::mutex timestamp_mtx;
-
-    std::string get_timestamp()
-    {
-        std::lock_guard<std::mutex> lck{timestamp_mtx};
-        const auto tt = std::time(NULL);
-        return std::ctime(&tt);
-    }
-
-    void entered(const char* f)
-    {
-        std::ostringstream oss;
-        oss << "Entered " << f << " at " << get_timestamp();
-        std::cout << oss.str();
-    }
-
-    void exiting(const char* f)
-    {
-        std::ostringstream oss;
-        oss << "Exiting " << f << " at " << get_timestamp();
-        std::cout << oss.str();
-    }
-
-    void get_logger()
-    {
-        entered(__FUNCTION__);
-        Logger::get_instance();
-        exiting(__FUNCTION__);
-    }
-
-    void get_duke()
-    {
-        entered(__FUNCTION__);
-        Duke::get_instance();
-        exiting(__FUNCTION__);
-    }
-}
-
-int main()
-{
-    std::thread t1{&get_duke};
-    std::thread t2{&get_logger};
-    t1.join();
-    t2.join();
-    return 0;
-}