[#uint256-2constructor-0d]
= xref:uint256.adoc[uint256]::uint256
:relfileprefix: ../
:mrdocs:

Constructs a uint256 by copying bytes from a span.

== Synopsis

Declared in `<uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
explicit
uint256(std::span<unsigned char const> vch);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *vch*
| A span of exactly 32 bytes to copy into the blob.
|===


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