[#BloombergLP-bdlb-BitStringUtil-minusEqual]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitStringUtil.adoc[BitStringUtil]::minusEqual
:relfileprefix: ../../../
:mrdocs:

Bitwise MINUS the specified `numBits` of the specified `srcBitString` starting at the specified `srcIndex` from the `numBits` of the specified `dstBitString` starting at the specified `dstIndex`, and write the result over the bits that were read from `dstBitString`. The behavior is undefined unless `dstBitString` has a length of at least `dstIndex + numBits` and `srcBitString` has a length of at least `srcIndex + numBits`. Note that the logical difference `A ‐ B` is defined to be `A & !B`.

== Synopsis

Declared in `<bdlb_bitstringutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
minusEqual(
    uint64_t* dstBitString,
    std::size_t dstIndex,
    uint64_t const* srcBitString,
    std::size_t srcIndex,
    std::size_t numBits);
----


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