[#GCSFilter-2constructor-0a]
= xref:GCSFilter.adoc[GCSFilter]::GCSFilter
:relfileprefix: ../
:mrdocs:

Constructors

== Synopses

Declared in `<blockfilter.h>`

Constructs an empty filter.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:GCSFilter/2constructor-08.adoc[GCSFilter](xref:GCSFilter/Params.adoc[Params] const& params = Params());
----

[.small]#xref:GCSFilter/2constructor-08.adoc[_» more..._]#

Builds a new filter from the params and set of elements.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:GCSFilter/2constructor-03.adoc[GCSFilter](
    xref:GCSFilter/Params.adoc[Params] const& params,
    xref:GCSFilter/ElementSet.adoc[ElementSet] const& elements);
----

[.small]#xref:GCSFilter/2constructor-03.adoc[_» more..._]#

Reconstructs an already‐created filter from an encoding.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:GCSFilter/2constructor-06.adoc[GCSFilter](
    xref:GCSFilter/Params.adoc[Params] const& params,
    std::vector<unsigned char> encoded_filter,
    bool skip_decode_check);
----

[.small]#xref:GCSFilter/2constructor-06.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *params*
| The SipHash keys and Golomb‐Rice coding parameters.
| *elements*
| The set of elements to insert into the filter.
| *encoded_filter*
| The serialized filter contents to decode.
| *skip_decode_check*
| If true, skip validating the encoded contents.
|===


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