[#conf_method_st-is_number]
= xref:conf_method_st.adoc[conf_method_st]::is_number
:relfileprefix: ../
:mrdocs:

Return non‐zero if `c` is a digit in this CONF method's number syntax.

== Synopsis

Declared in `<openssl/conftypes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int(* is_number)(xref:CONF.adoc[CONF] const*, char);
----


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