[#CSubNet-2constructor-01]
= xref:CSubNet.adoc[CSubNet]::CSubNet
:relfileprefix: ../
:mrdocs:

Construct from a given network start and mask.

== Synopsis

Declared in `<netaddress.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CSubNet(
    xref:CNetAddr.adoc[CNetAddr] const& addr,
    xref:CNetAddr.adoc[CNetAddr] const& mask);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *addr* [in]
| Network start. Must be IPv4 or IPv6, otherwise an invalid subnet is created.
| *mask* [in]
| Network mask, must be of the same type as `addr` and not contain 0‐bits followed by 1‐bits. Otherwise an invalid subnet is created.
|===


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