[#boost-urls-segments_encoded_ref-insert-07]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/segments_encoded_ref.adoc[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#L503[boost/url/segments_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/segments_encoded_base/iterator.adoc[iterator]
insert(
    xref:boost/urls/segments_encoded_base/iterator.adoc[iterator] before,
    FwdIt first,
    FwdIt last);
----

== Description


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

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

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


=== Mandates

[,cpp]
----
std::is_convertible< std::iterator_traits< FwdIt >::reference_type, pct_string_view >::value == true
----

=== Complexity

Linear in `std&colon;&colon;distance( first, last ) &plus; this&hyphen;&gt;url()&period;encoded&lowbar;resource()&period;size()`&period;


=== Exception Safety

Strong guarantee&period;        Calls to allocate may throw&period;        Exceptions thrown on invalid input&period;



== Exceptions


|===
| Name | Thrown on

| `system&lowbar;error`
| The range contains an invalid percent&hyphen;encoding&period;


|===

== Return Value


An iterator to the first        segment inserted, or `before` if        `init&period;empty()`&period;



== Parameters


|===
| Name | Description

| *before*
| An iterator before which        the range is inserted&period; This may        be equal to `end()`&period;


| *first*
| The first element in the range to insert&period;


| *last*
| One past the last element in the range to insert&period;


|===



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