[#VectorFormatter]
= VectorFormatter
:mrdocs:

Formatter to serialize/deserialize vector elements using another formatter

== Synopsis

Declared in `<serialize.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class Formatter>
struct VectorFormatter;
----

== Description

Example: struct X { std::vector<uint64_t> v; SERIALIZE_METHODS(X, obj) { READWRITE(Using<VectorFormatter<VarInt>>(obj.v)); } }; will define a struct that contains a vector of uint64_t, which is serialized as a vector of VarInt‐encoded integers.

V is not required to be an std::vector type. It works for any class that exposes a value_type, size, reserve, emplace_back, back, and const iterators.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:VectorFormatter/Ser.adoc[`Ser`] 
| Serialize a vector‐like container, writing its size then each element via the formatter.
| xref:VectorFormatter/Unser.adoc[`Unser`] 
| Unserialize a vector‐like container, allocating in bounded batches to limit memory use.
|===



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