[#BloombergLP-bdlb-BitStringUtil-assign1-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitStringUtil.adoc[BitStringUtil]::assign1
:relfileprefix: ../../../
:mrdocs:

Set one bit in `bitString` to `true`.

== Synopsis

Declared in `<bdlb_bitstringutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
assign1(
    uint64_t* bitString,
    std::size_t index);
----

== Description

Set the bit at the specified `index` in the specified `bitString` to `true`. The behavior is undefined unless `index` is less than the capacity of `bitString`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bitString*
| bit string to modify
| *index*
| bit position to set
|===


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