[#btck-operator_and_eq]
= xref:btck.adoc[btck]::operator&=
:relfileprefix: ../
:mrdocs:

Bitwise AND‐assign for a bitmask‐enum value.

== Synopsis

Declared in `<kernel/bitcoinkernel_wrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:btck/BitmaskEnum.adoc[BitmaskEnum] T>
constexpr
T&
operator&=(
    T& lhs,
    T rhs);
----

== Return Value

A reference to `lhs` after the operation.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The value modified in place.
| *rhs*
| The bit mask to keep.
|===


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