180. Static Memory

Question.10

A developer constructs a C++ object in static memory:

#include <new>

alignas(UART) static uint8_t uart_mem[sizeof(UART)];

void init() {
   UART* u = new (uart_mem) UART(9600);
   u->send(0x55);
}

What is the advantage over new UART(9600)?

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No advantage -- both allocate the same way
Placement new constructs the object in pre-allocated static memory (.bss) -- no heap allocation, no fragmentation, deterministic; the heap is not needed at all
Placement new is faster because it skips the constructor
Standard new uses static memory too

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