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| HDF5 Last Updated on 2026-07-28 The HDF5 Field Guide

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H5Mpublic.h File Reference
`#include "H5public.h"`
`#include "H5Ipublic.h"`
`#include "H5VLpublic.h"`
`#include "H5VLconnector.h"`

## Data Structures
union | H5VL_map_args_t

## Macros
#define | H5VL_MAP_CLOSE 9
#define | H5VL_MAP_CREATE 1
#define | H5VL_MAP_EXISTS 4
#define | H5VL_MAP_GET 6
#define | H5VL_MAP_GET_VAL 3
#define | H5VL_MAP_OPEN 2
#define | H5VL_MAP_OPTIONAL 8
#define | H5VL_MAP_PUT 5
#define | H5VL_MAP_SPECIFIC 7

## Typedefs
typedef herr_t(* | H5M_iterate_t) (hid_t map_id, const void *key, void *op_data)

## Enumerations
enum | H5VL_map_get_t { H5VL_MAP_GET_MAPL , H5VL_MAP_GET_MCPL , H5VL_MAP_GET_KEY_TYPE , H5VL_MAP_GET_VAL_TYPE , H5VL_MAP_GET_COUNT }
enum | H5VL_map_specific_t { H5VL_MAP_ITER , H5VL_MAP_DELETE }

## Functions
herr_t | H5Mclose (hid_t map_id)
| Terminates access to a map object.
herr_t | H5Mclose_async (hid_t map_id, hid_t es_id)
hid_t | H5Mcreate (hid_t loc_id, const char *name, hid_t key_type_id, hid_t val_type_id, hid_t lcpl_id, hid_t mcpl_id, hid_t mapl_id)
| Creates a map object.
hid_t | H5Mcreate_anon (hid_t loc_id, hid_t key_type_id, hid_t val_type_id, hid_t mcpl_id, hid_t mapl_id)
| Creates a map object without linking it into a file.
hid_t | H5Mcreate_async (hid_t loc_id, const char *name, hid_t key_type_id, hid_t val_type_id, hid_t lcpl_id, hid_t mcpl_id, hid_t mapl_id, hid_t es_id)
herr_t | H5Mdelete (hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t dxpl_id)
| Deletes a key-value pair from a map object.
herr_t | H5Mexists (hid_t map_id, hid_t key_mem_type_id, const void *key, bool *exists, hid_t dxpl_id)
| Checks if provided key exists in a map object.
herr_t | H5Mget (hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, void *value, hid_t dxpl_id)
| Retrieves a key-value pair from a map object.
hid_t | H5Mget_access_plist (hid_t map_id)
| Gets access property list for a map object.
herr_t | H5Mget_async (hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, void *value, hid_t dxpl_id, hid_t es_id)
herr_t | H5Mget_count (hid_t map_id, hsize_t *count, hid_t dxpl_id)
| Retrieves the number of key-value pairs in a map object.
hid_t | H5Mget_create_plist (hid_t map_id)
| Gets creation property list for a map object.
hid_t | H5Mget_key_type (hid_t map_id)
| Gets key datatype for a map object.
hid_t | H5Mget_val_type (hid_t map_id)
| Gets value datatype for a map object.
herr_t | H5Miterate (hid_t map_id, hsize_t *idx, hid_t key_mem_type_id, H5M_iterate_t op, void *op_data, hid_t dxpl_id)
| Iterates over all key-value pairs in a map object.
herr_t | H5Miterate_by_name (hid_t loc_id, const char *map_name, hsize_t *idx, hid_t key_mem_type_id, H5M_iterate_t op, void *op_data, hid_t dxpl_id, hid_t lapl_id)
| Iterates over all key-value pairs in a map object.
hid_t | H5Mopen (hid_t loc_id, const char *name, hid_t mapl_id)
| Opens a map object.
hid_t | H5Mopen_async (hid_t loc_id, const char *name, hid_t mapl_id, hid_t es_id)
herr_t | H5Mput (hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, const void *value, hid_t dxpl_id)
| Adds a key-value pair to a map object.
herr_t | H5Mput_async (hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, const void *value, hid_t dxpl_id, hid_t es_id)

## Macro Definition Documentation

## ◆ H5VL_MAP_CLOSE

#define H5VL_MAP_CLOSE 9

Callback operation ID for terminating access to a map

Since
  1.12.0

## ◆ H5VL_MAP_CREATE

#define H5VL_MAP_CREATE 1

Callback operation ID for map create

Since
  1.12.0

## ◆ H5VL_MAP_EXISTS

#define H5VL_MAP_EXISTS 4

Callback operation ID for checking if a value exists in a map

Since
  1.12.0

## ◆ H5VL_MAP_GET

#define H5VL_MAP_GET 6

Callback operation ID for map get callback

Since
  1.12.0

## ◆ H5VL_MAP_GET_VAL

#define H5VL_MAP_GET_VAL 3

Callback operation ID for getting an associated value from a map

Since
  1.12.0

## ◆ H5VL_MAP_OPEN

#define H5VL_MAP_OPEN 2

Callback operation ID for map open

Since
  1.12.0

## ◆ H5VL_MAP_OPTIONAL

#define H5VL_MAP_OPTIONAL 8

Currently unused

Since
  1.12.0

## ◆ H5VL_MAP_PUT

#define H5VL_MAP_PUT 5

Callback operation ID for putting a key-value pair to a map

Since
  1.12.0

## ◆ H5VL_MAP_SPECIFIC

#define H5VL_MAP_SPECIFIC 7

Callback operation ID for map specific operation

Since
  1.12.0

## Typedef Documentation

## ◆ H5M_iterate_t

typedef herr_t(* H5M_iterate_t) (hid_t map_id, const void *key, void *op_data)

Callback for H5Miterate()

## Enumeration Type Documentation

## ◆ H5VL_map_get_t

enum H5VL_map_get_t

Types for map GET callback

Enumerator
H5VL_MAP_GET_MAPL | Callback operation ID for getting map access property list Since 1.12.0
H5VL_MAP_GET_MCPL | Callback operation ID for getting map creation property list Since 1.12.0
H5VL_MAP_GET_KEY_TYPE | Callback operation ID for getting the key datatype for a map Since 1.12.0
H5VL_MAP_GET_VAL_TYPE | Callback operation ID for getting the value datatype for a map Since 1.12.0
H5VL_MAP_GET_COUNT | Callback operation ID for getting the number of key-value pairs stored in a map Since 1.12.0

## ◆ H5VL_map_specific_t

enum H5VL_map_specific_t

Types for map SPECIFIC callback

Enumerator
H5VL_MAP_ITER | Callback operation ID for iterating over all key-value pairs stored in the map Since 1.12.0
H5VL_MAP_DELETE | Callback operation ID for deleting a key-value pair stored in the map Since 1.12.0