Creates a new variable-length array datatype


H5T_VLEN_CREATE (base_type_id)


<pre><code class="language-c">hid_t H5Tvlen_create( hid_t base_type_id )</code></pre>

<pre><code class="language-fortran">SUBROUTINE h5tvlen_create_f(type_id, vltype_id, hdferr) 
  INTEGER(HID_T), INTENT(IN) :: type_id    ! Datatype identifier of base type 
                                           ! Base type can only be atomic 
  INTEGER(HID_T), INTENT(OUT) :: vltype_id ! VL datatype identifier 
  INTEGER, INTENT(OUT) :: hdferr           ! Error code
END SUBROUTINE h5tvlen_create_f</code></pre>

hid_t base_type_id    IN: Base type of datatype to create


H5T_VLEN_CREATE creates a new one-dimensional array datatype of variable-length (VL) with the base datatype base_type_id.

This one-dimensional array often represents a data sequence of the base datatype, such as characters for character sequences or vertex coordinates for polygon lists. The base type specified for the VL datatype can be any HDF5 datatype, including another VL datatype, a compound datatype, or an atomic datatype.

When necessary, use H5T_GET_SUPER to determine the base type of the VL datatype.

The datatype identifier returned from this function should be released with H5T_CLOSE or resource leaks will result. Under certain circumstances, H5D_VLEN_RECLAIM must also be used.

H5T_VLEN_CREATE cannot be used to create a variable-length string datatype. H5T_VLEN_CREATE called with a string or character base type creates a variable-length sequence of strings (a variable-length, 1-dimensional array), with each element of the array being of the string or character base type.

To create a variable-length string datatype, see “Creating variable-length string datatypes.”


Returns datatype identifier if successful; otherwise returns a negative value.


Coming Soon!

Release    Change
1.4.5Fortran subroutine introduced in this release.