[#uint256-FromUserHex]
= xref:uint256.adoc[uint256]::FromUserHex
:relfileprefix: ../
:mrdocs:

Parses a uint256 from user‐supplied hex, allowing a "0x" prefix and padding.

== Synopsis

Declared in `<uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
std::optional<uint256>
FromUserHex(std::string_view str);
----

== Return Value

The parsed uint256, or std::nullopt if the string is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *str*
| The hex string to parse.
|===


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