[#boost-urls-segments_encoded_ref-insert-04e]
= xref:boost/urls/segments_encoded_ref/insert-04e.adoc[boost::urls::segments_encoded_ref::insert]
:relfileprefix: ../../../
:mrdocs:

Insert segments

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_encoded_ref.hpp#L405[boost/url/segments_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/segments_encoded_base/iterator.adoc[iterator]
insert(
    xref:boost/urls/segments_encoded_base/iterator.adoc[iterator] before,
    xref:boost/urls/pct_string_view.adoc[pct_string_view] s);
----

== Description

This function inserts a segment before the specified position. Reserved characters in the segment are automatically escaped. Escapes in the segment are preserved.

All iterators that are equal to `before` or come after are invalidated.

== Complexity
Linear in `s.size() + this‐>url().encoded_resource().size()`.

== Exception Safety
Strong guarantee. Calls to allocate may throw. Exceptions thrown on invalid input.

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system_error`
| The segment contains an invalid percent‐encoding.
|===

== Return Value

An iterator to the inserted segment.

== Parameters

[cols=2]
|===
| Name
| Description
| *before*
| An iterator before which the segment is inserted. This may be equal to `end()`.
| *s*
| The segment to insert.
|===


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