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The index search interface includes functions to search for a first greater, first greater or equal, last less and and last less or equal key. They may retrieve the searched for key, its associated data or both.
The functions may be data type specific, or generic.
‘is_greater’, ‘is_g_<type-name>’
‘is_upper’, ‘is_u_<type-name>’
‘is_less’, ‘is_l_<type-name>’
‘is_lower’, ‘is_o_<type-name>’
‘isd_greater’
‘isd_upper’
‘isd_less’
‘isd_lower’
‘isk_greater’
‘isk_upper’
‘isk_less’
‘isk_lower’
The functions are described in the following sections.