[#DifferenceFormatter]
= DifferenceFormatter
:mrdocs:

Formatter that (de)serializes a monotonically increasing sequence as differences.

== Synopsis

Declared in `<blockencodings.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class DifferenceFormatter;
----

== Description

Successive values are encoded as the gap from the previous value, so a sorted list of indexes stays compact on the wire.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:DifferenceFormatter/Ser.adoc[`Ser`] 
| Writes the next value as its difference from the previous one.
| xref:DifferenceFormatter/Unser.adoc[`Unser`] 
| Reads the next value by adding the encoded difference to the running total.
|===



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