[#bsl-Deque_BlockCreator-reserveBlockSlots]
= xref:bsl.adoc[bsl]::xref:bsl/Deque_BlockCreator.adoc[Deque_BlockCreator]::reserveBlockSlots
:relfileprefix: ../../
:mrdocs:

Make room for `numNewBlocks` pointers in the blocks array.

== Synopsis

Declared in `<bslstl_deque.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/Deque_BlockCreator.adoc[Deque_BlockCreator<VALUE_TYPE, ALLOCATOR>::BlockPtr]*
reserveBlockSlots(
    xref:bsl/Deque_BlockCreator.adoc[size_type] numNewBlocks,
    bool atFront);
----

== Description

Make room for the specified `numNewBlocks` pointers in the blocks array. If the specified `atFront` is `true`, then make room at the front of the array, else make room at the back of the array. Return a pointer to the insertion point, i.e., the point where new blocks can be stored into the array, working backwards if `atFront` is `true`, or working forwards if `atFront` is `false`. This method invalidates all iterators and updates `d_deque_p‐>d_start` and `d_deque_p‐>d_finish`.

== Return Value

pointer to the insertion point for new block pointers

== Parameters

[cols="1,4"]
|===
| Name| Description
| *numNewBlocks*
| number of block‐pointer slots to reserve
| *atFront*
| `true` to reserve at the front; `false` at the back
|===


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