Containers.h

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 * Copyright (c) Onix Solutions Limited. All rights reserved.
 *
 * This software owned by Onix Solutions Limited and is protected by copyright law
 * and international copyright treaties.
 *
 * Access to and use of the software is governed by the terms of the applicable ONIXS Software
 * Services Agreement (the Agreement) and Customer end user license agreements granting
 * a non-assignable, non-transferable and non-exclusive license to use the software
 * for it's own data processing purposes under the terms defined in the Agreement.
 *
 * Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
 * of this source code or associated reference material to any other location for further reproduction
 * or redistribution, and any amendments to this copyright notice, are expressly prohibited.
 *
 * Any reproduction or redistribution for sale or hiring of the Software not in accordance with
 * the terms of the Agreement is a violation of copyright law.
 */
 
#pragma once
 
#include <stdexcept>
 
namespace OnixS { namespace ICE { namespace iMpact { namespace MarketData {

template <typename ItemType, typename SizeType>
class ArrayRef
{
public:
    typedef ItemType Item;
    typedef ItemType* Iterator;
 
    typedef SizeType Index;
    typedef SizeType Size;

    ArrayRef()
      : items_(0)
      , size_(0)
    {
    }

    ArrayRef(Item* const items, const Size itemsCount)
      : items_(items)
      , size_(itemsCount)
    {
    }

    template <typename OtherItem, typename OtherSize>
    ArrayRef(const ArrayRef<OtherItem, OtherSize>& other)
      : items_(other.items())
      , size_(other.size())
    {
    }

    template <typename OtherItem, typename OtherSize>
    ArrayRef& operator=(const ArrayRef<OtherItem, OtherSize>& other)
    {
        items_ = other.items();
        size_ = other.size();
 
        return *this;
    }

    ~ArrayRef() {}

    bool empty() const
    {
        return (0 == size_);
    }

    Size size() const
    {
        return size_;
    }

    Item* items() const
    {
        return items_;
    }

    Iterator begin() const
    {
        return items_;
    }

    Iterator end() const
    {
        return (items_ + size_);
    }

    Item& operator[](Index index) const
    {
        return items_[index];
    }

    Item& at(const Index index) const
    {
        if (index < size_)
        {
            return items_[index];
        }
 
        throw std::out_of_range("Index outside of range.");
    }

    void reset(Item* const items = 0, const Size size = 0)
    {
        items_ = items;
        size_ = size;
    }
 
protected:
    Item* items_;
    Size size_;
};
 
}}}} // namespace OnixS::ICE::iMpact::MarketData