[#arith_uint256-2constructor-005]
= xref:arith_uint256.adoc[arith_uint256]::arith_uint256
:relfileprefix: ../
:mrdocs:

Constructors

== Synopses

Declared in `<arith_uint256.h>`

Constructs a 256‐bit integer with a value of zero.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:arith_uint256/2constructor-00a.adoc[arith_uint256]() = default;
----

[.small]#xref:arith_uint256/2constructor-00a.adoc[_» more..._]#

Constructs a 256‐bit integer from a 64‐bit unsigned value.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:arith_uint256/2constructor-03.adoc[arith_uint256](uint64_t b);
----

[.small]#xref:arith_uint256/2constructor-03.adoc[_» more..._]#

Constructs a 256‐bit integer from a base class value.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:arith_uint256/2constructor-05.adoc[arith_uint256](xref:base_uint-02.adoc[base_uint<256>] const& b);
----

[.small]#xref:arith_uint256/2constructor-05.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| The value to store in the low 64 bits.
|===


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