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Minus Equal Sub
Basic Extensions Class

Public Sub MinusEqual( _
      ByRef rLeft As Variant _
    , ByVal vRight As Variant _
    )

"Minus Equals" or "Assign Subtraction"
Subtract vRight from rLeft and assign the result back into rLeft.
Similar to the C language "-=" operator.

Summary: This function is usually faster than the macroized eqivalent ("rLeft = rLeft - vRight") if rLeft is not a simple variable. This is because rLeft is passed-by-reference so that Visual Basic must only evaluate its address once.
Example: 
    Assuming
       Dim dblValue As Double
       dblValue = 2.5
    for example
       MinusEqual dblValue, 2
    leaves
       dblValue = .5
See also: 
    MinusEqualFn Function
    Subtract Function
    PlusEqual Subroutine
    TimesEqual Subroutine
    DivideEqual Subroutine
Definition (Visual Basic): 
    rLeft = rLeft - vRight
Definition (C): 
    rLeft -= vRight;
rLeft: Numeric or date value from which vRight is subtracted. The result of the subtraction is assigned back into the variable passed via rLeft, unless that value happens to be passed-by-value (in which case, calling this function has no effect).
vRight: The numeric value that is subtracted from rLeft.
Note: We would NOT use this subroutine to replace something like "dblValue = dblValue - 2", but we WOULD use it to replace something like "adblMatrix(intColumn, intRow, intItem) = adblMatrix(intColumn, intRow, intItem) - 2", especially since we only have to mention the "adblMatrix(intColumn, intRow, intItem)" part once.

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