Method assign

src/fl/stl/circular_buffer.h:21–27

        : mData(data), mCapacity(capacity), mHead(0), mTail(0), mFull(false) {}

    void assign(T* data, fl::size capacity) {
        mData = data;
        mCapacity = capacity;
        mHead = 0;
        mTail = 0;
        mFull = false;
    }

    bool push_back(const T &value) {
        if (mCapacity == 0) return false;