view.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
 *                                                                           *
 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * 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              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_TYPES_VIEW_H
#define VCL_TYPES_VIEW_H
 
#define ZIP_VIEW_INJECT_STD_VIEWS_NAMESPACE
#if __has_include(<zip_view.hpp>)
#include <zip_view.hpp>
#else
// inclusion for usage of vclib without CMake - not ideal but necessary for
// header only
#include "../../../external/zip-views-1.0/zip_view.hpp"
#endif
#undef ZIP_VIEW_INJECT_STD_VIEWS_NAMESPACE
 
#include <ranges>
 
namespace vcl {
 
template<typename It>
class View : public std::ranges::view_interface<View<It>>
{
public:
    using iterator       = It;
    using const_iterator = It;
 
    View() = default;
 
    View(It begin, It end) : mBegin(begin), mEnd(end) {}
 
    auto begin() const { return mBegin; }
 
    auto end() const { return mEnd; }
 
protected:
    It mBegin, mEnd;
};
 
} // namespace vcl
 
#endif // VCL_TYPES_VIEW_H