[#txt_db_st-qual]
= xref:txt_db_st.adoc[txt&lowbar;db&lowbar;st]::qual
:relfileprefix: ../
:mrdocs:

Optional per&hyphen;field predicates&semi; when non&hyphen;NULL, only rows for which qual(row) is true are indexed&period;

== Synopsis

Declared in `&lt;openssl&sol;txt&lowbar;db&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int(** qual)(xref:OPENSSL_STRING.adoc[OPENSSL&lowbar;STRING]*);
----


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