35. Placement New

Question.8

A developer uses placement new but forgets an include:

// No #include <new>
alignas(Sensor) uint8_t buf[sizeof(Sensor)];
Sensor* s = new (buf) Sensor();

What happens?

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Works fine -- placement new needs no include
Compilation error -- placement new requires #include <new> for the placement operator new overload
Works on GCC but fails on other compilers
Links but crashes at runtime