:relfileprefix: ../../../
[#boost-urls-params_encoded_ref-insert-0b]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/params_encoded_ref.adoc[pass:[params_encoded_ref]]::insert


Insert params


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L512[boost/url/params_encoded_ref.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
insert(
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] before,
    std::initializer_list<xref:boost/urls/param_pct_view.adoc[param_pct_view]> init);
----

=== Description


This function inserts the params in
an
_initializer-list_
before
the specified position.



All iterators that are equal to
`before` or come after are invalidated.
[NOTE]

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

=== Linear in `this-&gt;url().encoded_query().size()`.

=== Strong guarantee.

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



=== Exceptions

|===
| Name | Thrown on

| ``init``
| 
contains an invalid percent-encoding.

|===


=== Return Value


An iterator to the first
element inserted, or `before` if
`init.size() &equals;&equals; 0`.



=== Parameters

|===
| Name | Description 

| *before*
| 
An iterator before which
the element is inserted. This may
be equal to `end()`.

| *init*
| 
The list of params to insert.

|===