[#bsl-unordered_map-02b-erase-06]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::erase
:relfileprefix: ../../
:mrdocs:

Erase the elements in the half‐open range `[first, last)]`.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_map-02b/iterator.adoc[iterator]
erase(
    xref:bsl/unordered_map-02b/const_iterator.adoc[const_iterator] first,
    xref:bsl/unordered_map-02b/const_iterator.adoc[const_iterator] last);
----

== Description

Remove from this unordered map the `value_type` objects starting at the specified `first` position up to, but not including, the specified `last` position, and return `last`. This method invalidates only iterators and references to the removed element and previously saved values of the `end()` iterator, and preserves the relative order of the elements not removed. The behavior is undefined unless `first` and `last` either refer to elements in this unordered map or are the `end` iterator, and the `first` position is at or before the `last` position in the iteration sequence provided by this container.

== Return Value

`last`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *first*
| start of the range
| *last*
| end of the range (one past last)
|===


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