[#bitset_detail-IntBitSet-begin]
= xref:bitset_detail.adoc[bitset_detail]::xref:bitset_detail/IntBitSet.adoc[IntBitSet]::begin
:relfileprefix: ../../
:mrdocs:

Return an object that iterates over all 1 bits (++ and * only allowed when != end()).

== Synopsis

Declared in `<util/bitset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:bitset_detail/IntBitSet.adoc[Iterator]
begin() const noexcept;
----

== Return Value

An iterator to the first set bit.


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