100. Constructors-II

Question.5

A developer creates a compile-time configuration:

struct PinConfig {
   uint8_t port;
   uint8_t pin;
   constexpr PinConfig(uint8_t pt, uint8_t pn) : port(pt), pin(pn) {}
};

constexpr PinConfig LED_PIN(2, 5);

When is LED_PIN constructed?

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At runtime during startup
At compile time -- the constexpr constructor creates the object during compilation; the binary contains the literal values in Flash
At link time
Depends on optimization level

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