[#boost-urls-params_encoded_ref-insert-0b]
= xref:boost/urls/params_encoded_ref/insert-0b.adoc[boost::urls::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#L519[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,
    std::initializer_list<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.

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

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

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system_error`
| `init` contains an invalid percent‐encoding.
|===

== Return Value

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

== Parameters

[cols=2]
|===
| Name
| Description
| *before*
| An iterator before which the element is inserted. This may be equal to `end()`.
| *init*
| The list of params to insert.
|===


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