[#BloombergLP-bdlb-BitStringUtil-swapRaw]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitStringUtil.adoc[BitStringUtil]::swapRaw
:relfileprefix: ../../../
:mrdocs:

Exchange non‐overlapping bit ranges between two bit strings.

== Synopsis

Declared in `<bdlb_bitstringutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
swapRaw(
    uint64_t* bitString1,
    std::size_t index1,
    uint64_t* bitString2,
    std::size_t index2,
    std::size_t numBits);
----

== Description

Exchange the specified `numBits` beginning at the specified `index1` in the specified `bitString1` with the `numBits` beginning at the specified `index2` in the specified `bitString2`. The behavior is undefined unless `bitString1` has a length of at least `index1 + numBits`, `bitString2` has a length of at least `index2 + numBits`, and there is _no_ overlap between the swapped ranges of bits.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bitString1*
| first bit string
| *index1*
| starting bit index in `bitString1`
| *bitString2*
| second bit string
| *index2*
| starting bit index in `bitString2`
| *numBits*
| number of bits to exchange
|===


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