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


Erase elements

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L595[boost/url/params_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/erase-05.adoc[erase](xref:boost/urls/params_base/iterator.adoc[iterator] pos) noexcept;
----

[.small]#xref:boost/urls/params_ref/erase-05.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
xref:boost/urls/params_ref/erase-0f.adoc[erase](
    xref:boost/urls/params_base/iterator.adoc[iterator] first,
    xref:boost/urls/params_base/iterator.adoc[iterator] last) noexcept;
----

[.small]#xref:boost/urls/params_ref/erase-0f.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size_t
xref:boost/urls/params_ref/erase-00.adoc[erase](
    core::string_view key,
    xref:boost/urls/ignore_case_param.adoc[ignore_case_param] ic = {}) noexcept;
----

[.small]#xref:boost/urls/params_ref/erase-00.adoc[_» more..._]#

== 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


|===
| Name | Description

| *pos*
| An iterator to the element.


| *first,*
| last The range of        elements to erase.


| *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.


|===



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