[#boost-urls-params_encoded_ref-erase-00]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_ref.adoc[params&lowbar;encoded&lowbar;ref]::erase
:relfileprefix: ../../../
:mrdocs:


Erase params

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L657[boost&sol;url&sol;params&lowbar;encoded&lowbar;ref&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size&lowbar;t
erase(
    xref:boost/urls/pct_string_view.adoc[pct&lowbar;string&lowbar;view] key,
    xref:boost/urls/ignore_case_param.adoc[ignore&lowbar;case&lowbar;param] ic = &lcub;&rcub;) noexcept;
----

== Description


All iterators are invalidated&period;


=== Postconditions

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

=== Complexity

Linear in `this&hyphen;&gt;url()&period;encoded&lowbar;query()&period;size()`&period;


=== Exception Safety

Exceptions thrown on invalid input&period;



== Exceptions


|===
| Name | Thrown on

| `system&lowbar;error`
| `key` contains an invalid percent&hyphen;encoding&period;


|===

== Return Value


The number of params removed        from the container&period;



== Parameters


|===
| Name | Description

| *key*
| The key to match&period;        By default, a case&hyphen;sensitive        comparison is used&period;


| *ic*
| An optional parameter&period; If        the value xref:boost/urls/ignore_case.adoc[ignore&lowbar;case] is passed        here, the comparison is        case&hyphen;insensitive&period;


|===



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