:relfileprefix: ../../../
[#boost-urls-segments_ref-replace-07]

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


Replace segments


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_ref.hpp#L665[boost/url/segments_ref.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/segments_base/iterator.adoc[iterator]
replace(
    xref:boost/urls/segments_base/iterator.adoc[iterator] from,
    xref:boost/urls/segments_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.



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

=== Preconditions

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.

=== Complexity

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

=== Exception Safety

Strong guarantee.
Calls to allocate may throw.




== 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.

|===