[#bsl-bitset-set-04]
= xref:bsl.adoc[bsl]::xref:bsl/bitset.adoc[bitset]::set
:relfileprefix: ../../
:mrdocs:

Set the bit at the specified `pos` of this bitset to 1 and return a reference to this modifiable bitset. Optionally specify `val` as the value to set the bit. If `val` is non‐zero, the bit is set to 1, otherwise the bit is set to 0.

== Synopsis

Declared in `<bslstl_bitset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/bitset.adoc[bitset<N>]&
set(
    std::size_t pos,
    int val = true);
----


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