91. Basics of Classes

Question.4

A developer creates three UART driver instances:

class UART {
   volatile uint32_t* base_addr;
   uint32_t baud;
public:
   UART(uint32_t addr, uint32_t b) : base_addr((uint32_t*)addr), baud(b) {}
   void send(uint8_t byte) { /* write to base_addr */ }
};

UART uart1(0x40011000, 9600);
UART uart2(0x40004400, 115200);
UART uart3(0x40004800, 57600);

How does this compare to the C approach of passing UART_Handle_t* to every function?

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No difference -- both require explicit context
The C++ approach is cleaner -- each object carries its own context (this pointer); no handle parameter needed in every function call
The C approach is better -- classes use more memory
The C++ approach requires heap allocation for each instance

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