[#boost-urls-segments_encoded_ref-assign-0b]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/segments_encoded_ref.adoc[segments&lowbar;encoded&lowbar;ref]::assign
:relfileprefix: ../../../
:mrdocs:

Assign segments

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/segments_encoded_ref.hpp#L366[boost&sol;url&sol;segments&lowbar;encoded&lowbar;ref&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class FwdIt&gt;
void
assign(
    FwdIt first,
    FwdIt last);
----

== Description

The existing contents are replaced by a copy of the contents of the range&period; Reserved characters in the range are automatically escaped&period; Escapes in the range are preserved&period;

All iterators are invalidated&period;

[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&period;

====

== 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;query()&period;size() &plus; this&hyphen;&gt;url()&period;encoded&lowbar;fragment()&period;size()`&period;

== Exception Safety

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

== Exceptions

[cols="1,4"]
|===
| Name
| Thrown on
| `system&lowbar;error`
| The range contains an invalid percent&hyphen;encoding&period;
|===

== Parameters

[cols="1,4"]
|===
|Name|Description

| *first*
| The first element in the range&period;
| *last*
| One past the last element in the range&period;
|===


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