Help to fill the interface classes

I have the following interface files

Code:

---

class IMask
{
public:
        using value_type = double;

        virtual ~IMask() {}

        // [0, 360) in ascending order
        // nullptr if no values
        virtual const value_type* getAngles() const = 0;

        // Loss for each angle (positive dBi value)
        // nullptr if no values
        virtual const value_type* getValues() const = 0;

        // May be 0
        virtual size_t getValueCount() const = 0;
};

class IAntennaPattern
{
public:
        virtual ~IAntennaPattern() {}

        // Antenna pattern gain (dBi)
        virtual double getGain() const = 0;

        // Horizontal mask (clockwise, aligned to positive y axis)
        virtual const IMask* getHorizontalMask() const = 0;

        // Vertical mask
        virtual const IMask* getVerticalMask() const = 0;
};

class ITransmitter
{
public:
        // Returns the transmitter's position in meters.
        virtual const double3& getPosition() const = 0;

        // Returns the transmitter's frequency in MHz.
        virtual unsigned int getFrequencyMHz() const = 0;

        // Mechanical downtilt in °. Positive values => down, negative values => up.
        // Must not be called when model is unmasked
        virtual double getTilt() const = 0;

        // Azimuth in ° (clockwise, aligned to positive y axis).
        // Must not be called when model is unmasked
        virtual double getAzimuth() const = 0;

        // Antenna pattern
        // Must not be called when model is unmasked
        virtual const IAntennaPattern* getAntennaPattern() const = 0;

        virtual ~ITransmitter() {}
};

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I need to give the input in the following format

Code:

---

struct CalculationInput
{
        ITransmitter* transmitter;
        IReceiver*    receiver;
};

TestFunction
{
        velox::propagation_api::CalculationInput input;

        velox::propagation_api::CalculationOutput out;
        BSTR errorMessage=L"test error message";

        model.calculateGrid(input, out, &errorMessage);
}

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What is the best way to fill some data for the input.

Currently I added implementation classes for all the interface classes.like

Code:

---

template <typename T>
class EmptyMask:velox::propagation_api::IMask
{
private:
        int num_values;
        T values[100];

public:
        EmptyMask() { num_values = 0; };

        ~EmptyMask() {};

        // [0, 360) in ascending order
        // nullptr if no values
        const T* getAngles() const { return 0; };

        // Loss for each angle (positive dBi value)
        // nullptr if no values
        const T* getValues() const { return ; };

        // May be 0
        size_t getValueCount() const { return num_values; };
};

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Is there any better way. It is quite urgent