[#bsl-erase_if-0a4]
= xref:bsl.adoc[bsl]::erase_if
:relfileprefix: ../
:mrdocs:

Erase every element of `m` that satisfies `predicate`.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class KEY,
    class VALUE,
    class HASH,
    class EQUAL,
    class ALLOCATOR,
    class PREDICATE>
bsl::unordered_map<KEY, VALUE, HASH, EQUAL, ALLOCATOR>::size_type
erase_if(
    xref:bsl/unordered_map-02b.adoc[unordered_map<KEY, VALUE, HASH, EQUAL, ALLOCATOR>]& m,
    PREDICATE predicate);
----

== Description

Erase all the elements in the specified unordered_map `m` that satisfy the specified predicate `predicate`. Return the number of elements erased.

== Return Value

number of elements erased

== Parameters

[cols="1,4"]
|===
| Name| Description
| *m*
| unordered map from which matching elements are erased
| *predicate*
| unary predicate selecting elements to erase
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#