Member com::saxbophone::wondercard::MemoryCardSlot::read_block (std::size_t index, MemoryCard::Block data): Change return type to an enum or introduce exception throwing so the variety of causes of failure can be determined by the caller.
Member com::saxbophone::wondercard::MemoryCardSlot::read_sector (std::size_t index, MemoryCard::Sector data): Change return type to an enum or introduce exception throwing so the variety of causes of failure can be determined by the caller.