66. constexpr-i

Question.3

A developer writes a constexpr function to compute a baud rate divisor:

constexpr uint32_t baud_div(uint32_t clk, uint32_t baud) {
   return clk / baud;
}

constexpr uint32_t DIV = baud_div(16000000, 115200);

When is the division performed?

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At runtime when DIV is first accessed
At compile time -- the compiler computes 16000000/115200=138 and stores the literal 138
At link time by the linker
At runtime on first function call, then cached

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