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

Erase elements from `s` that satisfy `predicate`.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class KEY,
    class HASH,
    class EQUAL,
    class ALLOCATOR,
    class PREDICATE>
bsl::unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::size_type
erase_if(
    xref:bsl/unordered_set-0d2d.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>]& s,
    PREDICATE predicate);
----

== Description

Erase all the elements in the specified unordered_set `s` that satisfy the specified predicate `predicate`. Return the number of elements erased.

== Return Value

number of elements erased

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| unordered set from which to erase
| *predicate*
| predicate selecting elements to erase
|===


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