RangeAccessor.hpp

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#pragma once
 
#include <boost/iterator/iterator_facade.hpp>
 
namespace precice {
namespace mesh {
template <typename Source, typename Value>
class IndexRangeIterator : public boost::iterator_facade<
                               IndexRangeIterator<Source, const Value>,
                               const Value,
                               boost::random_access_traversal_tag> {
public:
  IndexRangeIterator() = default;
  IndexRangeIterator(Source *src, size_t index)
      : src_(src), idx_(index) {}
 
  const Value &dereference() const
  {
    using Coord = decltype(src_->vertex(idx_).rawCoords());
    static_assert(
        std::is_reference<Coord>::value,
        "Coordinate type must be a reference!");
    static_assert(
        std::is_convertible<Coord, Value>::value,
        "Exposed and accessed types must match!");
    return static_cast<const Value &>(src_->vertex(idx_).rawCoords());
  }
 
  size_t equal(const IndexRangeIterator<Source, Value> &other) const
  {
    return other.idx_ == idx_ && other.src_ == src_;
  }
 
  void increment()
  {
    ++idx_;
  }
 
  void decrement()
  {
    --idx_;
  }
 
  void advance(size_t n)
  {
    idx_ += n;
  }
 
  size_t distance_to(const IndexRangeIterator<Source, Value> &other) const
  {
    return other.idx_ - idx_;
  }
 
private:
  Source *src_{nullptr}; 
  size_t  idx_{0};       
};
 
} // namespace mesh
} // namespace precice