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// Copyright (c) 2020 Andrey Semashev
//
// 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)
#ifndef BOOST_ATOMIC_TESTS_ALIGNED_OBJECT_HPP_INCLUDED_
#define BOOST_ATOMIC_TESTS_ALIGNED_OBJECT_HPP_INCLUDED_
#include <cstddef>
#include <new>
#include <boost/config.hpp>
#include <boost/cstdint.hpp>
//! A wrapper that creates an object that has at least the specified alignment
template< typename T, std::size_t Alignment >
class aligned_object
{
private:
T* m_p;
unsigned char m_storage[Alignment + sizeof(T)];
public:
aligned_object()
{
m_p = new (get_aligned_storage()) T;
}
explicit aligned_object(T const& value)
{
m_p = new (get_aligned_storage()) T(value);
}
~aligned_object() BOOST_NOEXCEPT
{
m_p->~T();
}
T& get() const BOOST_NOEXCEPT
{
return *m_p;
}
BOOST_DELETED_FUNCTION(aligned_object(aligned_object const&))
BOOST_DELETED_FUNCTION(aligned_object& operator= (aligned_object const&))
private:
unsigned char* get_aligned_storage()
{
#if defined(BOOST_HAS_INTPTR_T)
typedef boost::uintptr_t uintptr_type;
#else
typedef std::size_t uintptr_type;
#endif
unsigned char* p = m_storage;
uintptr_type misalignment = ((uintptr_type)p) & (Alignment - 1u);
if (misalignment > 0)
p += Alignment - misalignment;
return p;
}
};
#endif // BOOST_ATOMIC_TESTS_ALIGNED_OBJECT_HPP_INCLUDED_
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