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

Returns true if there are no enabled callbacks.

== Synopsis

Declared in `<util/btcsignals.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard, requires_capability(0x7f2e358a31e8), requires_capability(0x7f2e3039c998), requires_capability(0x7f2e2b9df888), requires_capability(0x7f2e41adca88), requires_capability(0x7f2e321207e8), requires_capability(0x7f2e41e5ae78), requires_capability(0x7f2e27b0c4d8), requires_capability(0x7f2e411bb8c8)]]
bool
empty() const;
----

== Return Value

true if no connected callback is currently enabled.

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

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