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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Purpose: This file contains declarations which define macros for the
* H5M package. Including this header means that the source file
* is part of the H5M package.
*/
#ifndef H5Mmodule_H
#define H5Mmodule_H
/* Define the proper control macros for the generic FUNC_ENTER/LEAVE and error
* reporting macros.
*/
#define H5M_MODULE
#define H5_MY_PKG H5M
#define H5_MY_PKG_ERR H5E_MAP
#define H5_MY_PKG_INIT YES
/**
* \page H5M_UG The HDF5 VOL Data Mapping
* \Bold{The HDF5 Data Mapping can only be used with the HDF5 VOL connectors that
* implement map objects.} The native HDF5 library does not support this feature.
*
* \section sec_map The HDF5 Map Object
*
* \todo Describe the map life cycle.
*
* \todo How does MAPL fit into \ref subsubsec_plist_class.
*
* Previous Chapter \ref sec_vol - Next Chapter \ref sec_addition
*
*/
/**
* \defgroup H5M VOL Mapping (H5M)
*
* \details \Bold{The interface can only be used with the HDF5 VOL connectors that
* implement map objects.} The native HDF5 library does not support this
* feature.
*
* While the HDF5 data model is a flexible way to store data, some
* applications require a more general way to index information. HDF5
* effectively uses key-value stores internally for a variety of
* purposes, but it does not expose a generic key-value store to the
* API. The Map APIs provide this capability to the HDF5 applications
* in the form of HDF5 map objects. These Map objects contain
* application-defined key-value stores, to which key-value pairs can
* be added, and from which values can be retrieved by key.
*
* HDF5 VOL connectors with support for map objects:
* - DAOS
*
* \par Example:
* \code
* hid_t file_id, fapl_id, map_id, vls_type_id;
* const char *names[2] = ["Alice", "Bob"];
* uint64_t IDs[2] = [25385486, 34873275];
* uint64_t val_out;
*
* <HDF5 VOL setup code ....>
*
* vls_type_id = H5Tcopy(H5T_C_S1);
* H5Tset_size(vls_type_id, H5T_VARIABLE);
* file_id = H5Fcreate("file.h5", H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
* map_id = H5Mcreate(file_id, "map", vls_type_id, H5T_NATIVE_UINT64, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
* H5Mput(map_id, vls_type_id, &names[0], H5T_NATIVE_UINT64, &IDs[0], H5P_DEFAULT);
* H5Mput(map_id, vls_type_id, &names[1], H5T_NATIVE_UINT64, &IDs[1], H5P_DEFAULT);
* H5Mget(map_id, vls_type_id, &names[0], H5T_NATIVE_UINT64, &val_out, H5P_DEFAULT);
* if(val_out != IDs[0])
* ERROR;
* H5Mclose(map_id);
* H5Tclose(vls_type_id);
* H5Fclose(file_id);
* \endcode
*
*/
#endif /* H5Dmodule_H */
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