Enumeration Datatypes

Detailed Description

Functions
hid_t	H5Tenum_create (hid_t base_id)
	Creates a new enumeration datatype. More...
herr_t	H5Tenum_insert (hid_t type, const char *name, const void *value)
	Inserts a new enumeration datatype member. More...
herr_t	H5Tenum_nameof (hid_t type, const void *value, char *name, size_t size)
	Returns the symbol name corresponding to a specified member of an enumeration datatype. More...
herr_t	H5Tenum_valueof (hid_t type, const char *name, void *value)
	Returns the value corresponding to a specified member of an enumeration datatype. More...
herr_t	H5Tget_member_value (hid_t type_id, unsigned membno, void *value)
	Returns the value of an enumeration datatype member. More...

Function Documentation

H5Tenum_create()

hid_t H5Tenum_create

(

hid_t

base_id

)

Creates a new enumeration datatype.

Parameters

[in]

base_id

Datatype identifier for the base datatype. Must be an integer datatype

Returns

Returns a enumeration datatype identifier if successful; otherwise returns H5I_INVALID_HID.

H5Tenum_create() creates a new enumeration datatype based on the specified base datatype, dtype_id, which must be an integer datatype.

If a particular architecture datatype is required, a little endian or big endian datatype for example, use a native datatype as the base datatype and use H5Tconvert() on values as they are read from or written to a dataset.

Since

1.2.0

H5Tenum_insert()

herr_t H5Tenum_insert	(	hid_t	type,
		const char *	name,
		const void *	value
	)

Inserts a new enumeration datatype member.

Parameters

[in]	type	Datatype identifier
[in]	name	Name of the new member
[in]	value	Pointer to the value of the new member

Returns

Returns a non-negative value if successful; otherwise returns a negative value.

H5Tenum_insert() inserts a new enumeration datatype member into an enumeration datatype.

type_id is the datatype identifier for the enumeration datatype, name is the name of the new member, and value points to the value of the new member.

name and value must both be unique within dtype_id.

value points to data which must be of the integer base datatype used when the enumeration datatype was created. If a particular architecture datatype is required, a little endian or big endian datatype for example, use a native datatype as the base datatype and use H5Tconvert() on values as they are read from or written to a dataset.

Since

1.2.0

H5Tenum_nameof()

herr_t H5Tenum_nameof	(	hid_t	type,
		const void *	value,
		char *	name,
		size_t	size
	)

Returns the symbol name corresponding to a specified member of an enumeration datatype.

Parameters

[in]	type	Datatype identifier
[in]	value	Value of the enumeration datatype
[out]	name	Buffer for output of the symbol name
[in]	size	Anticipated size of the symbol name, in bytes

Returns

Returns a non-negative value if successful. Otherwise returns a negative value

H5Tenum_nameof() finds the symbol name that corresponds to the specified value of the enumeration datatype type.

At most size characters of the symbol name are copied into the name buffer. If the entire symbol name and null terminator do not fit in the name buffer, then as many characters as possible are copied (not null terminated) and the function fails.

Since

1.2.0

H5Tenum_valueof()

herr_t H5Tenum_valueof	(	hid_t	type,
		const char *	name,
		void *	value
	)

Returns the value corresponding to a specified member of an enumeration datatype.

Parameters

[in]	type	Datatype identifier
[in]	name	Symbol name of the enumeration datatype
[out]	value	Buffer for the value of the enumeration datatype

Returns

Returns a non-negative value if successful; otherwise returns a negative value.

H5Tenum_valueof() finds the value that corresponds to the specified name of the enumeration datatype dtype_id.

Values returned in value will be of the enumerated type’s base type, that is, the datatype used by H5Tenum_create() when the enumerated type was created.

The value buffer must be at least large enough to hold a value of that base type. If the size is unknown, you can determine it with H5Tget_size().

Since

1.2.0

H5Tget_member_value()

herr_t H5Tget_member_value	(	hid_t	type_id,
		unsigned	membno,
		void *	value
	)

Returns the value of an enumeration datatype member.

Parameters

[in]	type_id	Datatype identifier
[in]	membno	Number of the enumeration datatype member
[out]	value	Buffer for the value of the enumeration datatype member

Returns

Returns a non-negative value if successful; otherwise returns a negative value.

H5Tget_member_value() returns the value of the enumeration datatype member member_no.

The member value is returned in a user-supplied buffer pointed to by value. Values returned in value will be of the enumerated type’s base type, that is, the datatype used by H5Tenum_create() when the enumerated type was created.

The value buffer must be at least large enough to hold a value of that base type. If the size is unknown, you can determine it with H5Tget_size().

Since

1.2.0