atomic.h

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/*
 * 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()) {}
 
      explicit Atomic(const std::atomic<T>& data) : m_data(data.load()) {}
 
      ~Atomic() = default;
 
      Atomic(Atomic&& other) = default;
      Atomic& operator=(Atomic&& other) = 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;
      }
 
      explicit operator std::atomic<T>&() { return m_data; }
 
      // NOLINTNEXTLINE(*-explicit-conversions) FIXME
      operator T() { return m_data.load(); }
 
   private:
      std::atomic<T> m_data;
};
 
}  // namespace Botan
 
#endif