24. Inline Functions

Question.7

A developer uses both inline and constexpr for compile-time constants:

inline int baud_divisor(int clk, int baud) {
   return clk / baud;
}

constexpr int baud_divisor_ce(int clk, int baud) {
   return clk / baud;
}

int div1 = baud_divisor(16000000, 9600);
constexpr int div2 = baud_divisor_ce(16000000, 9600);

What is the key difference?

Need Help? Refer to the Quick Guide below

No difference — both are computed at compile time
constexpr is slower because it adds compile-time overhead
inline can only be used in headers; constexpr can be in .cpp files
inline expands the code at the call site, constexpr computes the result at compile time when given constant arguments

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