[#bsl-erase_if-04]
= xref:bsl.adoc[bsl]::erase_if
:relfileprefix: ../
:mrdocs:

Erase all elements in `s` that satisfy `predicate`.

== Synopsis

Declared in `<bslstl_set.h>`

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

== Description

Return the number of elements erased.

== Return Value

number of elements erased

== Parameters

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


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