[#boost-urls-params_encoded_ref-append-08]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_ref.adoc[params_encoded_ref]::append
:relfileprefix: ../../../
:mrdocs:

Append params

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L442[boost/url/params_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
append(
    FwdIt first,
    FwdIt last);
----

== Description

This function appends a range of params to the view.

The `end()` iterator is 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_pct_view >::value == true
----
== 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; Exceptions thrown on invalid input&period;

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system&lowbar;error`
| The range contains an invalid percent&hyphen;encoding&period;
|===

== Return Value

* An iterator to the first new element&period;
* An iterator to the first new element&period;

== Parameters

[cols=2]
|===
| Name
| Description
| *first*
| The first element to append&period;
| *last*
| One past the last element to append&period;
|===


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