[#BloombergLP-bdlc-BitArray-minusEqual-07]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/BitArray.adoc[BitArray]::minusEqual
:relfileprefix: ../../../
:mrdocs:

Subtract `value` from the bit at `index` (logical `A & !B`).

== Synopsis

Declared in `<bdlc_bitarray.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
minusEqual(
    std::size_t index,
    bool value);
----

== Description

MINUS (subtract) from the bit at the specified `index` in this array the specified `value` (retaining the result). The behavior is undefined unless `index < length()`. Note that the logical difference `A ‐ B` is defined to be `A & !B`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *index*
| bit position to modify
| *value*
| bit value to subtract at `index`
|===


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