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/*
* Copyright 2018, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* Iterface to access sequence of objects.
*/
#ifndef LIBPMEMOBJ_CPP_SLICE_HPP
#define LIBPMEMOBJ_CPP_SLICE_HPP
#include <iterator>
#include <type_traits>
namespace pmem
{
namespace obj
{
namespace experimental
{
/**
* pmem::obj::experimental::slice - provides interface to access
* sequence of objects.
*/
template <typename Iterator>
class slice {
public:
using size_type = std::size_t;
using iterator = Iterator;
using reverse_iterator = std::reverse_iterator<iterator>;
using reference = typename std::iterator_traits<iterator>::reference;
/**
* Constructor taking two RandomAccess iterators which define a range.
*
* @throw std::out_of_range if it_end < it_begin.
*/
slice(Iterator begin, Iterator end) : it_begin(begin), it_end(end)
{
static_assert(
std::is_same<typename std::iterator_traits<
iterator>::iterator_category,
std::random_access_iterator_tag>::value,
"Iterator should have RandomAccessIterator tag");
if (it_end < it_begin)
throw std::out_of_range("pmem::obj::slice");
}
/**
* Defaulted copy constructor.
*/
slice(const slice &other) noexcept = default;
/**
* Defaulted assignment operator.
*/
slice &operator=(const slice &other) noexcept = default;
/**
* Returns iterator to the beginning of the range.
*/
iterator
begin() const noexcept
{
return it_begin;
}
/**
* Returns iterator to the end of the range.
*/
iterator
end() const noexcept
{
return it_end;
}
/**
* Returns reverse iterator to the end.
*/
reverse_iterator
rend() const noexcept
{
return reverse_iterator(it_begin);
}
/**
* Returns reverse iterator to the beginning.
*/
reverse_iterator
rbegin() const noexcept
{
return reverse_iterator(it_end);
}
/**
* Element access operator.
*
* @throw std::out_of_range if idx is greater or equal to size.
*/
reference
at(size_type idx)
{
if (idx >= size())
throw std::out_of_range("pmem::obj::slice");
return it_begin[idx];
}
/**
* Element access operator.
* No bounds checking is performed.
*/
reference operator[](size_type idx)
{
return it_begin[idx];
}
size_type
size() const
{
return static_cast<size_type>(it_end - it_begin);
}
private:
iterator it_begin, it_end;
};
} /* namespace experimental */
} /* namespace obj */
} /* namespace pmem */
#endif /* LIBPMEMOBJ_CPP_SLICE_HPP */
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