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Plus Equal Sub
Basic Extensions Class

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

"Plus Equals" or "Assign Addition"
Add vRight to 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
       PlusEqual dblValue, 2
    leaves
       dblValue = 4.5
See also: 
    PlusEqualFn Function
    Addit Function
    MinusEqual Subroutine
    TimesEqual Subroutine
    DivideEqual Subroutine
Definition (Visual Basic): 
    rLeft = rLeft + vRight
Definition (C): 
    rLeft += vRight;
rLeft: Numeric or date value to which vRight is added. The result of the addition 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 added to 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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