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Write the implementation of member function isEmpty of class GasTank. Assume member function implementation is outside the class specification. As a reminder, here is a description of the members of class GasTank (note the detailed description of function addGas): A data member named amount of type double. A data member named capacity of type double. A constructor that accepts a parameter of type double. A function named addGas that accepts a parameter of type double and returns no value. The value of the amount data member is increased by the value of the parameter. However, if the value of amount is increased beyond the value of capacity, amount is set to capacity. A function named useGas that accepts a parameter of type double and returns no value. A function named isEmpty that returns true if data member amount is 1.5 or less. A function named isFull that accepts no parameters and returns a boolean value. A function named getGasLevel that accepts no parameters and returns double