[#BloombergLP-bdlb-BitUtil-isBitSet-0a8]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitUtil.adoc[BitUtil]::isBitSet
:relfileprefix: ../../../
:mrdocs:

Return whether the bit at `index` in `value` is set.

== Synopsis

Declared in `<bdlb_bitutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
isBitSet(
    unsigned int value,
    int index);
----

== Description

Return `true` if the bit in the specified `value` at the specified `index` is set to 1, and `false` otherwise. The behavior is undefined unless `0 <= index < sizeInBits(value)`.

== Return Value

`true` if the bit is set, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *value*
| value to inspect
| *index*
| bit position to test
|===


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