[#boost-urls-params_ref-assign-02]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_ref.adoc[params_ref]::assign
:relfileprefix: ../../../
:mrdocs:


Assign elements

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L349[boost/url/params_ref.hpp]>`

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

== Description


This function replaces the entire        contents of the view with the params        in the range.

All iterators are invalidated.

[NOTE]
The strings referenced by the inputs        must not come from the underlying url,        or else the behavior is undefined.


=== Mandates

[,cpp]
----
std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_view >::value == true
----

=== Complexity

Linear in the size of the range&period;


=== Exception Safety

Strong guarantee&period;        Calls to allocate may throw&period;



== Parameters


|===
| Name | Description

| *first,*
| last The range of params        to assign&period;


|===



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