[#bsl-multiset-03-erase-05]
= xref:bsl.adoc[bsl]::xref:bsl/multiset-03.adoc[multiset]::erase
:relfileprefix: ../../
:mrdocs:

Erase all elements equivalent to `key`.

== Synopsis

Declared in `<bslstl_multiset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/multiset-03/size_type.adoc[multiset<KEY, COMPARATOR, ALLOCATOR>::size_type]
erase(xref:bsl/multiset-03/key_type.adoc[key_type] const& key);
----

== Description

Remove from this multiset all `value_type` objects equivalent to the specified `key`, if they exist, and return the number of erased objects; otherwise, if there are no `value_type` objects equivalent to `key`, return 0 with no other effect. This method invalidates only iterators and references to the removed element and previously saved values of the `end()` iterator.

== Return Value

number of elements erased

== Parameters

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


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