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

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

== Synopsis

Declared in `<bslstl_deque.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class VALUE_TYPE,
    class ALLOCATOR,
    class PREDICATE>
deque<VALUE_TYPE, ALLOCATOR>::size_type
erase_if(
    xref:bsl/deque-0c.adoc[deque<VALUE_TYPE, ALLOCATOR>]& deq,
    PREDICATE predicate);
----

== Description

Erase all the elements in the specified deque `deq` that satisfy the specified predicate `predicate`. Return the number of elements erased.

== Return Value

number of elements erased

== Parameters

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


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