[#boost-urls-segments_ref-replace-07]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/segments_ref.adoc[segments_ref]::replace
:relfileprefix: ../../../
:mrdocs:


Replace segments

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_ref.hpp#L666[boost/url/segments_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,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‐>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() == 0`.



== Parameters


|===
| Name | Description

| *from*
| The beginning of the range of segments to replace.


| *to*
| The end of the range of segments to replace.


| *first*
| The beginning of the range of segments to assign.


| *last*
| The end of the range of segments to assign.


|===



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