130. RAII

Question.5

A developer manages DMA channel allocation with RAII:

class DMAGuard {
   int channel;
public:
   DMAGuard() : channel(dma_alloc_channel()) {}
   ~DMAGuard() { dma_free_channel(channel); }
   int get() const { return channel; }
   DMAGuard(const DMAGuard&) = delete;
   DMAGuard& operator=(const DMAGuard&) = delete;
};

If a function using DMAGuard throws an exception or returns early, what happens to the DMA channel?

Need Help? Refer to the Quick Guide below

The channel is leaked
The channel is freed only if the function returns normally
DMA channels cannot be managed with RAII
The channel is automatically freed

Restart quiz!