H5Reference_misc.hpp

/*
 *  Copyright (c), 2020, EPFL - Blue Brain Project
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 *
 */
 
#ifndef H5REFERENCE_MISC_HPP
#define H5REFERENCE_MISC_HPP
 
#include <string>
#include <H5Ppublic.h>
 
#include "H5Utils.hpp"
 
namespace h5gt {
 
inline Reference::Reference(const Object& location, const Object& object)
  : parent_id(location.getId(false)) {
  obj_name = details::get_name([&](char *buffer, hsize_t length) {
    return H5Iget_name(object.getId(false), buffer, length); });
}
 
inline void Reference::create_ref(hobj_ref_t* refptr) const {
  if (H5Rcreate(refptr, parent_id, obj_name.c_str(), H5R_OBJECT, -1) < 0) {
    HDF5ErrMapper::ToException<ReferenceException>(
          std::string("Unable to create the reference for \"") + obj_name + "\":");
  }
}
 
inline ObjectType Reference::getType(const Object& location) const {
  return get_ref(location).getObjectType();
}
 
template <typename T>
inline T Reference::dereference(const Object& location) const {
  static_assert(std::is_same<DataSet, T>::value || std::is_same<Group, T>::value,
      "We can only (de)reference h5gt::Group or h5gt:DataSet");
  auto obj = get_ref(location) ;
  if (obj.getObjectType() != T::type) {
    HDF5ErrMapper::ToException<ReferenceException>(
          "Trying to dereference the wrong type");
  }
#if defined __GNUC__ && __GNUC__ < 9
  return std::move(obj);
#else
  return obj;
#endif
}
 
inline Object Reference::get_ref(const Object& location) const {
  hid_t res;
#if (H5Rdereference_vers == 2)
  if ((res = H5Rdereference(location.getId(false), H5P_DEFAULT, H5R_OBJECT, &href)) < 0) {
    HDF5ErrMapper::ToException<ReferenceException>("Unable to dereference.");
  }
#else
  if ((res = H5Rdereference(location.getId(false), H5R_OBJECT, &href)) < 0) {
    HDF5ErrMapper::ToException<ReferenceException>("Unable to dereference.");
  }
#endif
  return Object(res);
}
 
}  // namespace h5gt
 
#endif  // H5REFERENCE_MISC_HPP