91. Basics of Classes

Question.8

A developer needs to define a GPS coordinate and a UART driver. Which should be a struct and which a class?

// Option A: Both as classes
class Coordinate { public: float lat, lon; };
class UART_Driver { /* private state + public API */ };

// Option B: Coordinate as struct, Driver as class
struct Coordinate { float lat, lon; };
class UART_Driver { /* private state + public API */ };

Which follows embedded C++ best practice?

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Option A -- always use class for consistency
Option B -- use struct for plain data containers (all public, no behavior); use class for objects with invariants and behavior
Both are wrong -- everything should be a struct in embedded
Option A -- struct should never be used in C++

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