[#absl-ConcatCrc32c]
= xref:absl.adoc[absl]::ConcatCrc32c
:relfileprefix: ../
:mrdocs:

Compute the CRC32C value of two concatenated buffers.

== Synopsis

Declared in `<absl/crc/crc32c.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/crc32c_t.adoc[crc32c_t]
ConcatCrc32c(
    xref:absl/crc32c_t.adoc[crc32c_t] crc1,
    xref:absl/crc32c_t.adoc[crc32c_t] crc2,
    size_t crc2_length);
----

== Description

Calculates the CRC32C value of two buffers with known CRC32C values concatenated together.

Given a buffer with CRC32C value `crc1` and a buffer with CRC32C value `crc2` and length, `crc2_length`, returns the CRC32C value of the concatenation of these two buffers.

This operation has a runtime cost of O(log(`crc2_length`)).

== Return Value

The CRC32C value of the concatenated buffers.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *crc1*
| The CRC32C value of the first buffer.
| *crc2*
| The CRC32C value of the second buffer.
| *crc2_length*
| The length in bytes of the second buffer.
|===


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