30. Dynamic Memory Allocation-i

Question.8

A firmware architect allows new only during initialization, never inside the main loop. Why is this acceptable?

void system_init() {
   uart_buf = new uint8_t[UART_BUF_SIZE];
   sensor  = new Sensor(I2C_BUS);
}

int main() {
   system_init();
   while (true) { /* NEVER call new/delete here */ }
}

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Because the memory is eventually freed by the OS
Because allocating memory once and never freeing avoids both fragmentation and non-determinism
Because new during init uses the stack
This pattern is never acceptable -- heap must be completely banned