[#bsl-multimap-0ae-erase-0c5]
= xref:bsl.adoc[bsl]::xref:bsl/multimap-0ae.adoc[multimap]::erase
:relfileprefix: ../../
:mrdocs:

Erase all elements matching `key`.

== Synopsis

Declared in `<bslstl_multimap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_KEY>
xref:bsl/multimap-0ae/size_type.adoc[size_type]
erase(t_KEY&& key)
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   t_KEY>::value &&
        !is_convertible<BSLS_COMPILERFEATURES_FORWARD_REF(t_KEY),
                        iterator>::value &&
        !is_convertible<BSLS_COMPILERFEATURES_FORWARD_REF(t_KEY),
                        const_iterator>::value;
----

== Description

Remove all elements whose keys compare equivalent to the specified transparent `key`, and return the number of elements erased.

== Return Value

number of elements erased

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key whose matching elements are erased
|===


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