:relfileprefix: ../../../
[#boost-urls-segments_encoded_ref-replace-0f]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/segments_encoded_ref.adoc[pass:[segments_encoded_ref]]::replace


Replace segments


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_encoded_ref.hpp#L716[boost/url/segments_encoded_ref.hpp,window=blank_]>`

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

=== Description


This function replaces a range of
segments with annother range of segments.
Reserved characters in the new range are
automatically escaped.
Escapes in the new range are preserved.



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

=== None of the character buffers referenced

by the new range may overlap the character
buffer of the underlying url, or else
the behavior is undefined.

=== Linear in `std::distance( first, last ) + this-&gt;url().encoded_resouce().size()`.

=== Strong guarantee.

Calls to allocate may throw.
Exceptions thrown on invalid input.



=== Exceptions

|===
| Name | Thrown on

| `The`
| 
range contains an invalid percent-encoding.

|===


=== Return Value


An iterator to the first
segment inserted, or one past `to` if
`init.size() &equals;&equals; 0`.



=== Parameters

|===
| Name | Description 

| *from,*
| 
to The range of segments to replace.

| *first,*
| 
last The range of segments to assign.

|===




