[#internal_bswap_64]
= internal&lowbar;bswap&lowbar;64
:mrdocs:

Reverses the byte order of a 64&hyphen;bit value&period;

== Synopsis

Declared in `&lt;compat&sol;byteswap&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
uint64&lowbar;t
internal&lowbar;bswap&lowbar;64(uint64&lowbar;t x);
----

== Return Value

The value with its byte order reversed&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *x*
| The value whose eight bytes are swapped&period;
|===


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