[#base_uint-0d-2constructor-02]
= xref:base_uint-0d.adoc[base_uint<256>]::base_uint
:relfileprefix: ../
:mrdocs:

Constructors

== Synopses

Declared in `<arith_uint256.h>`

Constructs a big integer with a value of zero.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:base_uint-0d/2constructor-06.adoc[base_uint]();
----

[.small]#xref:base_uint-0d/2constructor-06.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:base_uint-0d/2constructor-0a.adoc[base_uint](uint64_t b);
----

[.small]#xref:base_uint-0d/2constructor-0a.adoc[_» more..._]#

Copy‐constructs a big integer from another of the same width.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:base_uint-0d/2constructor-03.adoc[base_uint](xref:base_uint-02.adoc[base_uint<256>] const& b) = default;
----

[.small]#xref:base_uint-0d/2constructor-03.adoc[_» more..._]#

== Parameters

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


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