[#boost-urls-segments_encoded_ref-replace-08]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/segments_encoded_ref.adoc[segments_encoded_ref]::replace
:relfileprefix: ../../../
:mrdocs:


Replace segments

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_encoded_ref.hpp#L672[boost/url/segments_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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,
    std::initializer_list<xref:boost/urls/pct_string_view.adoc[pct_string_view]> init);
----

== Description


This function replaces a range of        segments with a list of segments in        an initializer list.        Reserved characters in the list are        automatically escaped.        Escapes in the list are preserved.

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


=== Preconditions

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


=== Complexity

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


=== Exception Safety

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



== Exceptions


|===
| Name | Thrown on

| `system_error`
| The list contains an invalid percent‐encoding.


|===

== Return Value


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



== Parameters


|===
| Name | Description

| *from*
| The first element in the range of segments to replace.


| *to*
| One past the last element in the range of segments to replace.


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


|===



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