[#btcsignals-signal-empty]
= xref:btcsignals.adoc[btcsignals]::xref:btcsignals/signal.adoc[signal]::empty
:relfileprefix: ../../
:mrdocs:

Returns true if there are no enabled callbacks&period;

== Synopsis

Declared in `&lt;util&sol;btcsignals&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;nodiscard, requires&lowbar;capability(0x7f9521bf82a8), requires&lowbar;capability(0x7f9500a48178), requires&lowbar;capability(0x7f951f8ebef8), requires&lowbar;capability(0x7f950d443be8), requires&lowbar;capability(0x7f95133b6428), requires&lowbar;capability(0x7f95231b73b8), requires&lowbar;capability(0x7f9516ce7c08), requires&lowbar;capability(0x7f9503ad2058)&rsqb;&rsqb;
bool
empty() const;
----

== Return Value

true if no connected callback is currently enabled&period;

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====

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