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

Like FromHex(std::string_view str), but allows an "0x" prefix and pads the input with leading zeroes if it is shorter than the expected length of uintN_t::size()*2.

== Synopsis

Declared in `<uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class uintN_t>
std::optional<uintN_t>
FromUserHex(std::string_view input);
----

== Description

Designed to be used when dealing with user input.

== Return Value

The parsed value, or std::nullopt if the input is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The hex string to parse, optionally prefixed with "0x".
|===


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