[#txt_db_st-qual]
= xref:txt_db_st.adoc[txt_db_st]::qual
:relfileprefix: ../
:mrdocs:

Optional per‐field predicates; when non‐NULL, only rows for which qual(row) is true are indexed.

== Synopsis

Declared in `<openssl/txt_db.h>`

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


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