[#boost-urls-params_encoded_ref-insert-03]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_ref.adoc[params_encoded_ref]::insert
:relfileprefix: ../../../
:mrdocs:


Insert params

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L471[boost/url/params_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
insert(
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] before,
    xref:boost/urls/param_pct_view.adoc[param_pct_view] const& p);
----

== Description


This function inserts a param        before the specified position.

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


=== Complexity

Linear in `this‐>url().encoded_query().size()`.


=== Exception Safety

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



== Exceptions


|===
| Name | Thrown on

| `system_error`
| `p` contains an invalid percent‐encoding.


|===

== Return Value


An iterator to the inserted        element.



== Parameters


|===
| Name | Description

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


| *p*
| The param to insert.


|===



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