text: /*
   * Distributed under the Boost Software License, Version 1.0.
   * (See accompanying file LICENSE_1_0.txt or copy at
   * http://www.boost.org/LICENSE_1_0.txt)
   *
   * Copyright (c) 2011 Helge Bahmann
   * Copyright (c) 2013 Tim Blechmann
   * Copyright (c) 2014 Andrey Semashev
   */
  /*!
   * \file   atomic/detail/atomic_template.hpp
   *
   * This header contains interface definition of \c atomic template.
   */
  
  #ifndef BOOST_ATOMIC_DETAIL_ATOMIC_TEMPLATE_HPP_INCLUDED_
  #define BOOST_ATOMIC_DETAIL_ATOMIC_TEMPLATE_HPP_INCLUDED_
  
  #include <cstddef>
  #include <boost/cstdint.hpp>
  #include <boost/assert.hpp>
  #include <boost/type_traits/is_signed.hpp>
  #include <boost/type_traits/is_integral.hpp>
  #include <boost/atomic/detail/config.hpp>
  #include <boost/atomic/detail/bitwise_cast.hpp>
  #include <boost/atomic/detail/operations_fwd.hpp>
  
  #ifdef BOOST_HAS_PRAGMA_ONCE
  #pragma once
  #endif
  
  #if defined(BOOST_MSVC)
  #pragma warning(push)
  // 'boost::atomics::atomic<T>' : multiple assignment operators specified
  #pragma warning(disable: 4522)
  #endif
  
  /*
   * IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
   *                      see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
   */
  
  namespace boost {
  namespace atomics {
  namespace detail {
  
  BOOST_FORCEINLINE BOOST_CONSTEXPR memory_order deduce_failure_order(memory_order order) BOOST_NOEXCEPT
  {
      return order == memory_order_acq_rel ? memory_order_acquire : (order == memory_order_release ? memory_order_relaxed : order);
  }
  
  BOOST_FORCEINLINE BOOST_CONSTEXPR bool cas_failure_order_must_not_be_stronger_than_success_order(memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
  {
      // 15 == (memory_order_seq_cst | memory_order_consume), see memory_order.hpp
      // Given the enum values we can test the strength of memory order requirements with this single condition.
      return (failure_order & 15u) <= (success_order & 15u);
  }
  
  template< typename T, bool IsInt = boost::is_integral< T >::value >
  struct classify
  {
      typedef void type;
  };
  
  template< typename T >
  struct classify< T, true > { typedef int type; };
  
  template< typename T >
  struct classify< T*, false > { typedef void* type; };
  
  template< typename T, typename Kind >
  class base_atomic;
  
  //! Implementation for integers
  template< typename T >
  class base_atomic< T, int >
  {
  private:
      typedef T value_type;
      typedef T difference_type;
      typedef atomics::detail::operations< storage_size_of< value_type >::value, boost::is_signed< T >::value > operations;
  
  protected:
      typedef value_type value_arg_type;
  
  public:
      typedef typename operations::storage_type storage_type;
  
  protected:
      typename operations::aligned_storage_type m_storage;
  
  public:
      BOOST_DEFAULTED_FUNCTION(base_atomic(), {})
      BOOST_CONSTEXPR explicit base_atomic(value_type v) BOOST_NOEXCEPT : m_storage(v) {}
  
      BOOST_FORCEINLINE void store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_consume);
          BOOST_ASSERT(order != memory_order_acquire);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          operations::store(m_storage.value, static_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE value_type load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_release);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          return static_cast< value_type >(operations::load(m_storage.value, order));
      }
  
      BOOST_FORCEINLINE value_type fetch_add(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::fetch_add(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type fetch_sub(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::fetch_sub(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::exchange(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = static_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_strong(m_storage.value, old_value, static_cast< storage_type >(desired), success_order, failure_order);
          expected = static_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_strong(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = static_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_weak(m_storage.value, old_value, static_cast< storage_type >(desired), success_order, failure_order);
          expected = static_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_weak(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE value_type fetch_and(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::fetch_and(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type fetch_or(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::fetch_or(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type fetch_xor(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return static_cast< value_type >(operations::fetch_xor(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
      {
          return operations::is_lock_free(m_storage.value);
      }
  
      BOOST_FORCEINLINE value_type operator++(int) volatile BOOST_NOEXCEPT
      {
          return fetch_add(1);
      }
  
      BOOST_FORCEINLINE value_type operator++() volatile BOOST_NOEXCEPT
      {
          return fetch_add(1) + 1;
      }
  
      BOOST_FORCEINLINE value_type operator--(int) volatile BOOST_NOEXCEPT
      {
          return fetch_sub(1);
      }
  
      BOOST_FORCEINLINE value_type operator--() volatile BOOST_NOEXCEPT
      {
          return fetch_sub(1) - 1;
      }
  
      BOOST_FORCEINLINE value_type operator+=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_add(v) + v;
      }
  
      BOOST_FORCEINLINE value_type operator-=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_sub(v) - v;
      }
  
      BOOST_FORCEINLINE value_type operator&=(value_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_and(v) & v;
      }
  
      BOOST_FORCEINLINE value_type operator|=(value_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_or(v) | v;
      }
  
      BOOST_FORCEINLINE value_type operator^=(value_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_xor(v) ^ v;
      }
  
      BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
      BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
  };
  
  //! Implementation for bool
  template< >
  class base_atomic< bool, int >
  {
  private:
      typedef bool value_type;
      typedef atomics::detail::operations< 1u, false > operations;
  
  protected:
      typedef value_type value_arg_type;
  
  public:
      typedef operations::storage_type storage_type;
  
  protected:
      operations::aligned_storage_type m_storage;
  
  public:
      BOOST_DEFAULTED_FUNCTION(base_atomic(), {})
      BOOST_CONSTEXPR explicit base_atomic(value_type v) BOOST_NOEXCEPT : m_storage(v) {}
  
      BOOST_FORCEINLINE void store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_consume);
          BOOST_ASSERT(order != memory_order_acquire);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          operations::store(m_storage.value, static_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE value_type load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_release);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          return !!operations::load(m_storage.value, order);
      }
  
      BOOST_FORCEINLINE value_type exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return !!operations::exchange(m_storage.value, static_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = static_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_strong(m_storage.value, old_value, static_cast< storage_type >(desired), success_order, failure_order);
          expected = !!old_value;
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_strong(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = static_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_weak(m_storage.value, old_value, static_cast< storage_type >(desired), success_order, failure_order);
          expected = !!old_value;
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_weak(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
      {
          return operations::is_lock_free(m_storage.value);
      }
  
      BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
      BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
  };
  
  
  //! Implementation for user-defined types, such as structs and enums
  template< typename T >
  class base_atomic< T, void >
  {
  private:
      typedef T value_type;
      typedef atomics::detail::operations< storage_size_of< value_type >::value, false > operations;
  
  protected:
      typedef value_type const& value_arg_type;
  
  public:
      typedef typename operations::storage_type storage_type;
  
  protected:
      typename operations::aligned_storage_type m_storage;
  
  public:
      BOOST_FORCEINLINE explicit base_atomic(value_type const& v = value_type()) BOOST_NOEXCEPT : m_storage(atomics::detail::bitwise_cast< storage_type >(v))
      {
      }
  
      BOOST_FORCEINLINE void store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_consume);
          BOOST_ASSERT(order != memory_order_acquire);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          operations::store(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE value_type load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_release);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          return atomics::detail::bitwise_cast< value_type >(operations::load(m_storage.value, order));
      }
  
      BOOST_FORCEINLINE value_type exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::exchange(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_strong(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_strong(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_weak(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_weak(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
      {
          return operations::is_lock_free(m_storage.value);
      }
  
      BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
      BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
  };
  
  
  //! Implementation for pointers
  template< typename T >
  class base_atomic< T*, void* >
  {
  private:
      typedef T* value_type;
      typedef std::ptrdiff_t difference_type;
      typedef atomics::detail::operations< storage_size_of< value_type >::value, false > operations;
  
  protected:
      typedef value_type value_arg_type;
  
  public:
      typedef typename operations::storage_type storage_type;
  
  protected:
      typename operations::aligned_storage_type m_storage;
  
  public:
      BOOST_DEFAULTED_FUNCTION(base_atomic(), {})
      BOOST_FORCEINLINE explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : m_storage(atomics::detail::bitwise_cast< storage_type >(v))
      {
      }
  
      BOOST_FORCEINLINE void store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_consume);
          BOOST_ASSERT(order != memory_order_acquire);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          operations::store(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE value_type load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_release);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          return atomics::detail::bitwise_cast< value_type >(operations::load(m_storage.value, order));
      }
  
      BOOST_FORCEINLINE value_type fetch_add(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::fetch_add(m_storage.value, static_cast< storage_type >(v * sizeof(T)), order));
      }
  
      BOOST_FORCEINLINE value_type fetch_sub(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::fetch_sub(m_storage.value, static_cast< storage_type >(v * sizeof(T)), order));
      }
  
      BOOST_FORCEINLINE value_type exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::exchange(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_strong(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_strong(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_weak(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_weak(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
      {
          return operations::is_lock_free(m_storage.value);
      }
  
      BOOST_FORCEINLINE value_type operator++(int) volatile BOOST_NOEXCEPT
      {
          return fetch_add(1);
      }
  
      BOOST_FORCEINLINE value_type operator++() volatile BOOST_NOEXCEPT
      {
          return fetch_add(1) + 1;
      }
  
      BOOST_FORCEINLINE value_type operator--(int) volatile BOOST_NOEXCEPT
      {
          return fetch_sub(1);
      }
  
      BOOST_FORCEINLINE value_type operator--() volatile BOOST_NOEXCEPT
      {
          return fetch_sub(1) - 1;
      }
  
      BOOST_FORCEINLINE value_type operator+=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_add(v) + v;
      }
  
      BOOST_FORCEINLINE value_type operator-=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return fetch_sub(v) - v;
      }
  
      BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
      BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
  };
  
  
  //! Implementation for void pointers
  template< >
  class base_atomic< void*, void* >
  {
  private:
      typedef void* value_type;
      typedef std::ptrdiff_t difference_type;
      typedef atomics::detail::operations< storage_size_of< value_type >::value, false > operations;
  
  protected:
      typedef value_type value_arg_type;
  
  public:
      typedef operations::storage_type storage_type;
  
  protected:
      operations::aligned_storage_type m_storage;
  
  public:
      BOOST_DEFAULTED_FUNCTION(base_atomic(), {})
      BOOST_FORCEINLINE explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : m_storage(atomics::detail::bitwise_cast< storage_type >(v))
      {
      }
  
      BOOST_FORCEINLINE void store(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_consume);
          BOOST_ASSERT(order != memory_order_acquire);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          operations::store(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order);
      }
  
      BOOST_FORCEINLINE value_type load(memory_order order = memory_order_seq_cst) const volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(order != memory_order_release);
          BOOST_ASSERT(order != memory_order_acq_rel);
  
          return atomics::detail::bitwise_cast< value_type >(operations::load(m_storage.value, order));
      }
  
      BOOST_FORCEINLINE value_type fetch_add(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::fetch_add(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type fetch_sub(difference_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::fetch_sub(m_storage.value, static_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE value_type exchange(value_type v, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return atomics::detail::bitwise_cast< value_type >(operations::exchange(m_storage.value, atomics::detail::bitwise_cast< storage_type >(v), order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_strong(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_strong(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_strong(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order success_order, memory_order failure_order) volatile BOOST_NOEXCEPT
      {
          BOOST_ASSERT(failure_order != memory_order_release);
          BOOST_ASSERT(failure_order != memory_order_acq_rel);
          BOOST_ASSERT(cas_failure_order_must_not_be_stronger_than_success_order(success_order, failure_order));
  
          storage_type old_value = atomics::detail::bitwise_cast< storage_type >(expected);
          const bool res = operations::compare_exchange_weak(m_storage.value, old_value, atomics::detail::bitwise_cast< storage_type >(desired), success_order, failure_order);
          expected = atomics::detail::bitwise_cast< value_type >(old_value);
          return res;
      }
  
      BOOST_FORCEINLINE bool compare_exchange_weak(value_type& expected, value_type desired, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
      {
          return compare_exchange_weak(expected, desired, order, atomics::detail::deduce_failure_order(order));
      }
  
      BOOST_FORCEINLINE bool is_lock_free() const volatile BOOST_NOEXCEPT
      {
          return operations::is_lock_free(m_storage.value);
      }
  
      BOOST_FORCEINLINE value_type operator++(int) volatile BOOST_NOEXCEPT
      {
          return fetch_add(1);
      }
  
      BOOST_FORCEINLINE value_type operator++() volatile BOOST_NOEXCEPT
      {
          return (char*)fetch_add(1) + 1;
      }
  
      BOOST_FORCEINLINE value_type operator--(int) volatile BOOST_NOEXCEPT
      {
          return fetch_sub(1);
      }
  
      BOOST_FORCEINLINE value_type operator--() volatile BOOST_NOEXCEPT
      {
          return (char*)fetch_sub(1) - 1;
      }
  
      BOOST_FORCEINLINE value_type operator+=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return (char*)fetch_add(v) + v;
      }
  
      BOOST_FORCEINLINE value_type operator-=(difference_type v) volatile BOOST_NOEXCEPT
      {
          return (char*)fetch_sub(v) - v;
      }
  
      BOOST_DELETED_FUNCTION(base_atomic(base_atomic const&))
      BOOST_DELETED_FUNCTION(base_atomic& operator=(base_atomic const&))
  };
  
  } // namespace detail
  
  template< typename T >
  class atomic :
      public atomics::detail::base_atomic< T, typename atomics::detail::classify< T >::type >
  {
  private:
      typedef T value_type;
      typedef atomics::detail::base_atomic< T, typename atomics::detail::classify< T >::type > base_type;
      typedef typename base_type::value_arg_type value_arg_type;
  
  public:
      typedef typename base_type::storage_type storage_type;
  
  public:
      BOOST_DEFAULTED_FUNCTION(atomic(), BOOST_NOEXCEPT {})
  
      // NOTE: The constructor is made explicit because gcc 4.7 complains that
      //       operator=(value_arg_type) is considered ambiguous with operator=(atomic const&)
      //       in assignment expressions, even though conversion to atomic<> is less preferred
      //       than conversion to value_arg_type.
      BOOST_FORCEINLINE explicit BOOST_CONSTEXPR atomic(value_arg_type v) BOOST_NOEXCEPT : base_type(v) {}
  
      BOOST_FORCEINLINE value_type operator= (value_arg_type v) volatile BOOST_NOEXCEPT
      {
          this->store(v);
          return v;
      }
  
      BOOST_FORCEINLINE operator value_type() volatile const BOOST_NOEXCEPT
      {
          return this->load();
      }
  
      BOOST_FORCEINLINE storage_type& storage() BOOST_NOEXCEPT { return this->m_storage.value; }
      BOOST_FORCEINLINE storage_type volatile& storage() volatile BOOST_NOEXCEPT { return this->m_storage.value; }
      BOOST_FORCEINLINE storage_type const& storage() const BOOST_NOEXCEPT { return this->m_storage.value; }
      BOOST_FORCEINLINE storage_type const volatile& storage() const volatile BOOST_NOEXCEPT { return this->m_storage.value; }
  
      BOOST_DELETED_FUNCTION(atomic(atomic const&))
      BOOST_DELETED_FUNCTION(atomic& operator= (atomic const&))
      BOOST_DELETED_FUNCTION(atomic& operator= (atomic const&) volatile)
  };
  
  typedef atomic< char > atomic_char;
  typedef atomic< unsigned char > atomic_uchar;
  typedef atomic< signed char > atomic_schar;
  typedef atomic< uint8_t > atomic_uint8_t;
  typedef atomic< int8_t > atomic_int8_t;
  typedef atomic< unsigned short > atomic_ushort;
  typedef atomic< short > atomic_short;
  typedef atomic< uint16_t > atomic_uint16_t;
  typedef atomic< int16_t > atomic_int16_t;
  typedef atomic< unsigned int > atomic_uint;
  typedef atomic< int > atomic_int;
  typedef atomic< uint32_t > atomic_uint32_t;
  typedef atomic< int32_t > atomic_int32_t;
  typedef atomic< unsigned long > atomic_ulong;
  typedef atomic< long > atomic_long;
  typedef atomic< uint64_t > atomic_uint64_t;
  typedef atomic< int64_t > atomic_int64_t;
  #ifdef BOOST_HAS_LONG_LONG
  typedef atomic< boost::ulong_long_type > atomic_ullong;
  typedef atomic< boost::long_long_type > atomic_llong;
  #endif
  typedef atomic< void* > atomic_address;
  typedef atomic< bool > atomic_bool;
  typedef atomic< wchar_t > atomic_wchar_t;
  #if !defined(BOOST_NO_CXX11_CHAR16_T)
  typedef atomic< char16_t > atomic_char16_t;
  #endif
  #if !defined(BOOST_NO_CXX11_CHAR32_T)
  typedef atomic< char32_t > atomic_char32_t;
  #endif
  
  typedef atomic< int_least8_t > atomic_int_least8_t;
  typedef atomic< uint_least8_t > atomic_uint_least8_t;
  typedef atomic< int_least16_t > atomic_int_least16_t;
  typedef atomic< uint_least16_t > atomic_uint_least16_t;
  typedef atomic< int_least32_t > atomic_int_least32_t;
  typedef atomic< uint_least32_t > atomic_uint_least32_t;
  typedef atomic< int_least64_t > atomic_int_least64_t;
  typedef atomic< uint_least64_t > atomic_uint_least64_t;
  typedef atomic< int_fast8_t > atomic_int_fast8_t;
  typedef atomic< uint_fast8_t > atomic_uint_fast8_t;
  typedef atomic< int_fast16_t > atomic_int_fast16_t;
  typedef atomic< uint_fast16_t > atomic_uint_fast16_t;
  typedef atomic< int_fast32_t > atomic_int_fast32_t;
  typedef atomic< uint_fast32_t > atomic_uint_fast32_t;
  typedef atomic< int_fast64_t > atomic_int_fast64_t;
  typedef atomic< uint_fast64_t > atomic_uint_fast64_t;
  typedef atomic< intmax_t > atomic_intmax_t;
  typedef atomic< uintmax_t > atomic_uintmax_t;
  
  typedef atomic< std::size_t > atomic_size_t;
  typedef atomic< std::ptrdiff_t > atomic_ptrdiff_t;
  
  #if defined(BOOST_HAS_INTPTR_T)
  typedef atomic< intptr_t > atomic_intptr_t;
  typedef atomic< uintptr_t > atomic_uintptr_t;
  #endif
  
  } // namespace atomics
  } // namespace boost
  
  #if defined(BOOST_MSVC)
  #pragma warning(pop)
  #endif
  
  #endif // BOOST_ATOMIC_DETAIL_ATOMIC_TEMPLATE_HPP_INCLUDED_
  