Range.hpp

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// This file is part of the ACTS project.
//
// Copyright (C) 2016 CERN for the benefit of the ACTS project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
#pragma once
 
#include <iterator>
#include <utility>
 
namespace ActsExamples {

template <typename Iterator>
class Range {
   public:
    Range(const Iterator& b, const Iterator& e) : m_begin(b), m_end(e) {}
    Range(Range&&) noexcept = default;
    Range(const Range&) = default;
    ~Range() = default;
    Range& operator=(Range&&) noexcept = default;
    Range& operator=(const Range&) = default;
    Iterator begin() const { return m_begin; }
    Iterator end() const { return m_end; }
    bool empty() const { return m_begin == m_end; }
    std::size_t size() const { return std::distance(m_begin, m_end); }
 
   private:
    Iterator m_begin;
    Iterator m_end;
};
 
template <typename Iterator>
Range<Iterator> makeRange(const Iterator& begin, const Iterator& end) {
    return Range<Iterator>(begin, end);
}
 
template <typename Iterator>
Range<Iterator> makeRange(const std::pair<Iterator, Iterator>& range) {
    return Range<Iterator>(range.first, range.second);
}
 
}  // namespace ActsExamples