ArrowProxy.h

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/*
 * (C) Copyright 2019 Met Office UK
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 */
 
#ifndef UFO_UTILS_ARROWPROXY_H_
#define UFO_UTILS_ARROWPROXY_H_
 
namespace ufo {
 
/// \brief Utility class used in overloads of operator-> in forward iterators.
///
/// See e.g. A. O'Dwyer's blog, https://quuxplusone.github.io/blog/2019/02/06/arrow-proxy.
template<class T>
class ArrowProxy {
 public:
  explicit ArrowProxy(const T &ref) :
    ref_(ref)
  {}
 
  T *operator->() {
    return &ref_;
  }
 
 private:
  T ref_;
};
 
}  // namespace ufo
 
#endif  // UFO_UTILS_ARROWPROXY_H_