RAD Studio VCL Reference
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Decrements a specified measurement by a specified amount.
Call ConvUnitDec two decrement a measurement by a specified amount. The result is returned in the same measurement units as the original amount, although the amount by which the measurement is decremented can be expressed using a different unit of measurement in the same family.
AValue is the original measurement.
AType is the unit of measurement of the starting amount and the return value.
AAmount is the amount by which to decrease AValue. If this value is omitted, it is assumed to be one.
AAmountType is the unit of measurement for AAmount.
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