Before/After SafeArrayPtr

/**
 * SAFEARRAY* "before"...
 */
void before() {
    CSafeArrayHolder saLinesArray;
    HRESULT hr;
    LONG idx;
    IUnknown* pUNK;
    _bstr_t b_str;
    LONG UBound = 0;

    saLinesArray.AttachSafeArray(spIMaster->GetLines());

    // Arrays are zero-based. No need to get LBound
    hr = SafeArrayGetUBound( saLinesArray, 1, &UBound);
    if (FAILED(hr))
    {
        b_str = L"SafeArrayGetUBound in GetLine failed";
        throw SyncMgrEx(b_str.GetBSTR());
    }

    // Currently only one line is supported
    if ((UBound + 1) != 1)
    {
        b_str = L"Only one line per Master is supported";
        throw SyncMgrEx(b_str.GetBSTR());
    }

    for (idx = 0; idx < (UBound + 1) ; idx++)
    {
        hr = SafeArrayGetElement(   saLinesArray,
                                    &idx,
                                    reinterpret_cast<void*>(&pUNK));
        spILine = pUNK;
        if (spILine.GetInterfacePtr() == NULL)
        {
            b_str = L"Unexpected interface in GetLine";
            throw SyncMgrEx(b_str.GetBSTR());
        }

    }
}


/**
 * SafeArrayPtr "after"...
 */
void after()
{
    SafeArrayPtr<ILinePtr> lines = master->GetLines();
    if(lines.size() != 1) {
        ASSERT(false);  //< We only support one line at the moment.
        return nullptr;
    }
    auto line = lines.at(0);
}