[#boost-urls-params_ref-append]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_ref.adoc[params&lowbar;ref]::append
:relfileprefix: ../../../
:mrdocs:


Append elements

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L380[boost&sol;url&sol;params&lowbar;ref&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-0f.adoc[append](xref:boost/urls/param_view.adoc[param&lowbar;view] const& p);
----

[.small]#xref:boost/urls/params_ref/append-0f.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-07.adoc[append](std::initializer&lowbar;list&lt;xref:boost/urls/param_view.adoc[param&lowbar;view]&gt; init);
----

[.small]#xref:boost/urls/params_ref/append-07.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class FwdIt&gt;
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/append-0c.adoc[append](
    FwdIt first,
    FwdIt last);
----

[.small]#xref:boost/urls/params_ref/append-0c.adoc[_» more..._]#

== Description


This function appends a param to the view&period;

The `end()` iterator is invalidated&period;


=== Example

[,cpp]
----
url u;

u.params().append( { "first", "John" } );
----

=== Complexity

Linear in `this&hyphen;&gt;url()&period;encoded&lowbar;query()&period;size()`&period;


=== Exception Safety

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



== Return Value


An iterator to the new element&period;



== Parameters


|===
| Name | Description

| *p*
| The param to append&period;


| *init*
| The list of params to append&period;


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


|===



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