:relfileprefix: ../../../
[#boost-urls-params_ref-erase-00]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/params_ref.adoc[pass:[params_ref]]::erase


Erase elements


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L652[boost/url/params_ref.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:std.adoc[std]::size_t
erase(
    core::string_view key,
    xref:boost/urls/ignore_case_param.adoc[ignore_case_param] ic = = {}) noexcept;
----

== Description




All iterators are invalidated.

=== Postconditions
[,cpp]
----
this->count( key, ic ) == 0
----

=== Complexity

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

=== Exception Safety

Throws nothing.




== Return Value


The number of elements removed
from the container.



== Parameters

|===
| Name | Description 

| *key*
| 
The key to match.
By default, a case-sensitive
comparison is used.

| *ic*
| 
An optional parameter. If
the value
xref:boost/urls/ignore_case.adoc[ignore_case]
is passed
here, the comparison is
case-insensitive.

|===