[#base_uint-0d-2constructor-03]
= xref:base_uint-0d.adoc[base_uint<256>]::base_uint
:relfileprefix: ../
:mrdocs:

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

== Synopsis

Declared in `<arith_uint256.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| The value to copy.
|===


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