fixedcapacitystack.hh

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// -*- tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=8 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-GPL-2.0-only-with-PDELab-exception
 
#ifndef DUNE_TYPETREE_FIXEDCAPACITYSTACK_HH
#define DUNE_TYPETREE_FIXEDCAPACITYSTACK_HH
 
#include <array>
#include <cassert>
 
namespace Dune {
  namespace TypeTree {
 
 
 
    template<typename T>
    class FixedCapacityStackView
    {
 
    public:
 
      struct Impl
      {
 
        Impl(T* data, std::size_t capacity)
          : _data(data)
          , _size(0)
          , _capacity(capacity)
        {}
 
        T * const _data;
        std::size_t _size;
        const std::size_t _capacity;
      };
 
      FixedCapacityStackView(Impl& impl)
        : _impl(impl)
      {}
 
    public:
 
      std::size_t size() const
      {
        return _impl._size;
      }
 
      std::size_t capacity() const
      {
        return _impl._capacity;
      }
 
      bool empty() const
      {
        return _impl._size == 0;
      }
 
      bool full() const
      {
        return _impl._size == _impl._capacity;
      }
 
      void push_back(const T& t)
      {
        assert(!full());
        _impl._data[_impl._size++] = t;
      }
 
      void pop_back()
      {
        assert(!empty());
        --_impl._size;
      }
 
      T& back()
      {
        assert(!empty());
        return _impl._data[_impl._size-1];
      }
 
      const T& back() const
      {
        assert(!empty());
        return _impl._data[_impl._size-1];
      }
 
      T& front()
      {
        assert(!empty());
        return _impl._data[0];
      }
 
      const T& front() const
      {
        assert(!empty());
        return _impl._data[0];
      }
 
      T& operator[](std::size_t k)
      {
        assert(k < _impl._size);
        return _impl._data[k];
      }
 
      const T& operator[](std::size_t k) const
      {
        assert(k < _impl._size);
        return _impl._data[k];
      }
 
    private:
      Impl& _impl;
 
    };
 
 
    template<typename T, std::size_t capacity>
    class FixedCapacityStack
      : private std::array<T,capacity>
      , private FixedCapacityStackView<T>::Impl
      , public FixedCapacityStackView<T>
    {
 
      typedef FixedCapacityStackView<T> view_base;
 
    public:
 
      using view_base::back;
      using view_base::front;
      using view_base::size;
      using view_base::operator[];
 
      FixedCapacityStack()
        : FixedCapacityStackView<T>::Impl(&(static_cast<std::array<T,capacity>&>(*this)[0]),capacity)
        , FixedCapacityStackView<T>(static_cast<typename FixedCapacityStackView<T>::Impl&>(*this))
      {}
 
    private:
 
      //FixedCapacityStack(const FixedCapacityStack&);
      FixedCapacityStack& operator=(const FixedCapacityStack&);
 
    };
 
 
  } // namespace TypeTree
} //namespace Dune
 
#endif // DUNE_TYPETREE_FIXEDCAPACITYSTACK_HH