[#boost-urls-segments_ref-insert-09]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/segments_ref.adoc[segments_ref]::insert
:relfileprefix: ../../../
:mrdocs:


Insert segments

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_ref.hpp#L424[boost/url/segments_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/segments_base/iterator.adoc[iterator]
insert(
    xref:boost/urls/segments_base/iterator.adoc[iterator] before,
    std::initializer_list<core::string_view> init);
----

== Description


This function inserts the segments        in an initializer list before the        specified position.        Reserved characters in the list are        percent‐escaped in the result.

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

[NOTE]
None of the character buffers referenced        by the list may overlap the character        buffer of the underlying url, or else        the behavior is undefined.


=== Example

[,cpp]
----
url u( "/file.txt" );

u.segments().insert( u.segments().begin(), { "path", "to" } );
----

=== Complexity

Linear in `init.size() + this‐>url().encoded_resource().size()`.


=== Exception Safety

Strong guarantee.        Calls to allocate may throw.



== Return Value


An iterator to the first        element inserted, or `before` if        `init.size() == 0`.



== Parameters


|===
| Name | Description

| *before*
| An iterator before which        the list is inserted. This may        be equal to `end()`.


| *init*
| The list of segments to insert.


|===



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