[#boost-urls-params_ref-erase-05]
= xref:boost/urls/params_ref/erase-05.adoc[boost::urls::params_ref::erase]
:relfileprefix: ../../../
:mrdocs:

Erase elements

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L600[boost/url/params_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base.adoc[iterator]
erase(xref:boost/urls/params_base.adoc[iterator] pos) noexcept;
----

== Description

This function removes an element from the container.

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

== Example
[,cpp]
----
url u( "?first=John&last=Doe" );

params_ref::iterator it = u.params().erase( u.params().begin() );

assert( u.encoded_query() == "last=Doe" );
----
== Complexity
Linear in `this‐>url().encoded_query().size()`.

== Exception Safety
Throws nothing.

== Return Value

An iterator to one past the removed element.

== Parameters

[cols=2]
|===
| Name
| Description
| *pos*
| An iterator to the element.
|===


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