/*

 * Atomic

 * (C) 2016 Matthias Gierlings

 *

 * Botan is released under the Simplified BSD License (see license.txt)

 **/

#ifndef BOTAN_ATOMIC_H_

#define BOTAN_ATOMIC_H_

#include <botan/types.h>

#include <atomic>

#include <memory>

namespace Botan {

template <typename T>

/**

 * Simple helper class to expand std::atomic with copy constructor and copy

 * assignment operator, i.e. for use as element in a container like

 * std::vector. The construction of instances of this wrapper is NOT atomic

 * and needs to be properly guarded.

 **/

class Atomic final {

   public:

      Atomic() = default;

      Atomic(const Atomic& data) : m_data(data.m_data.load()) {}

      Atomic(const std::atomic<T>& data) : m_data(data.load()) {}

      ~Atomic() = default;

      Atomic& operator=(const Atomic& other) {

         if(this != &other) {

            m_data.store(other.m_data.load());

         }

         return *this;

      }

      Atomic& operator=(const std::atomic<T>& a) {

         m_data.store(a.load());

         return *this;

      }

      operator std::atomic<T>&() { return m_data; }

      operator T() { return m_data.load(); }

   private:

      std::atomic<T> m_data;

};

}  // namespace Botan

#endif