C++ Cumulative Moving Average Class

file.cpp

template<typename NumberT>
class CumulativeMovingAverage
{
    NumberT     _total = 0;
    std::size_t _count = 0;

public:
    float value() const
    {
        // TODO: pretty sure only one cast is need, but not 100% sure
        return (static_cast<float>(_total) / static_cast<float>(_count));
    }

    void addValue(NumberT v)
    {
        _total += v;
        _count++;
    }

    void reset()
    {
        _total = 0;
        _count = 0;
    }
};