[#uint256-2constructor-07]
= xref:uint256.adoc[uint256]::uint256
:relfileprefix: ../
:mrdocs:

Constructs a uint256 at compile time from a hex string.

== Synopsis

Declared in `<uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
consteval
explicit
uint256(std::string_view hex_str);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hex_str*
| A hex string that must fit the 256‐bit blob exactly.
|===


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