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

Returns the position of the highest bit set plus one, or zero if the value is zero.

== Synopsis

Declared in `<arith_uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned int
bits() const;
----

== Return Value

The one‐based index of the most significant set bit, or zero.


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