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Copyright (c) 2019, 2020 MariaDB Corporation.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA

*****************************************************************************/

#pragma once

#include &lt;cstddef&gt;
#include &lt;iterator&gt;

namespace st_
{

namespace detail
{

template &lt;class T&gt; struct remove_cv
{
  typedef T type;
};
template &lt;class T&gt; struct remove_cv&lt;const T&gt;
{
  typedef T type;
};
template &lt;class T&gt; struct remove_cv&lt;volatile T&gt;
{
  typedef T type;
};
template &lt;class T&gt; struct remove_cv&lt;const volatile T&gt;
{
  typedef T type;
};

} // namespace detail

template &lt;class ElementType&gt; class span
{
public:
  typedef ElementType element_type;
  typedef typename detail::remove_cv&lt;ElementType&gt;::type value_type;
  typedef size_t size_type;
  typedef ptrdiff_t difference_type;
  typedef element_type *pointer;
  typedef const element_type *const_pointer;
  typedef element_type &amp;reference;
  typedef const element_type &amp;const_reference;
  typedef pointer iterator;
  typedef const_pointer const_iterator;
  typedef std::reverse_iterator&lt;iterator&gt; reverse_iterator;

  span() : data_(NULL), size_(0) {}

  span(pointer ptr, size_type count) : data_(ptr), size_(count) {}

  span(pointer first, pointer last) : data_(first), size_(last - first) {}

  template &lt;size_t N&gt; span(element_type (&amp;arr)[N]) : data_(arr), size_(N) {}

  template &lt;class Container&gt;
  span(Container &amp;cont) : data_(cont.data()), size_(cont.size())
  {
  }

  template &lt;class Container&gt;
  span(const Container &amp;cont) : data_(cont.data()), size_(cont.size())
  {
  }

  span(const span &amp;other) : data_(other.data_), size_(other.size_) {}

  ~span() = default;

  span &amp;operator=(const span &amp;other)
  {
    data_= other.data();
    size_= other.size();
    return *this;
  }

  template &lt;size_t Count&gt; span&lt;element_type&gt; first() const
  {
    assert(!empty());
    return span(data(), 1);
  }
  template &lt;size_t Count&gt; span&lt;element_type&gt; last() const
  {
    assert(!empty());
    return span(data() + size() - 1, 1);
  }

  span&lt;element_type&gt; first(size_type count) const
  {
    assert(!empty());
    return span(data(), 1);
  }
  span&lt;element_type&gt; last(size_type count) const
  {
    assert(!empty());
    return span(data() + size() - 1, 1);
  }
  span&lt;element_type&gt; subspan(size_type offset, size_type count) const
  {
    assert(!empty());
    assert(size() &gt;= offset + count);
    return span(data() + offset, count);
  }

  size_type size() const { return size_; }
  size_type size_bytes() const { return size() * sizeof(ElementType); }
  bool empty() const __attribute__((warn_unused_result))
  {
    return size() == 0;
  }

  reference operator[](size_type idx) const
  {
    assert(size() &gt; idx);
    return data()[idx];
  }
  reference front() const
  {
    assert(!empty());
    return data()[0];
  }
  reference back() const
  {
    assert(!empty());
    return data()[size() - 1];
  }
  pointer data() const { return data_; }

  iterator begin() const { return data_; }
  iterator end() const { return data_ + size_; }
  reverse_iterator rbegin() const
  {
    return std::reverse_iterator&lt;iterator&gt;(end());
  }
  reverse_iterator rend() const
  {
    return std::reverse_iterator&lt;iterator&gt;(begin());
  }

private:
  pointer data_;
  size_type size_;
};

} // namespace st_
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