[#util-Join-012]
= xref:util.adoc[util]::Join
:relfileprefix: ../
:mrdocs:

Join all container items. Typically used to concatenate strings but accepts containers with elements of any type.

== Synopsis

Declared in `<util/string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename C,
    typename S,
    typename UnaryOp>
auto
Join(
    C const& container,
    S const& separator,
    UnaryOp unary_op);
----

== Return Value

The concatenation of the transformed items separated by separator.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *container*
| The items to join
| *separator*
| The separator
| *unary_op*
| Apply this operator to each item
|===


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