confused on the requirement to use mbed.h for certain code use cases

Official Hardware Nano Family Nano 33 BLE
1

I had came across this code which provides a different method for "delay()" on the nano ble 33 board by making use of an mbed function.

https://forum.arduino.cc/index.php?topic=638478.0

Anyway, according to mbed the wait_ms is deprecated and one should use thread_sleep_for instead.

So, I tested this with a similar program, as follows:

#include <mbed.h>
using namespace mbed;

void setup()
{
pinMode(LED_BUILTIN, OUTPUT);
}

void loop()
{
digitalWrite(LED_BUILTIN, HIGH);
thread_sleep_for(1000);
digitalWrite(LED_BUILTIN, LOW);
thread_sleep_for(1000);
}

Then, just to learn what sort of errors I might get, I commented out the "#include <mbed.h>" and the "using namespace" and to my great surprise the sketch still compiled and uploaded without error.

Does this mean that mbed.h is included by default.

2

Yes its included in arduino.h that is automatically included in the main Arduino program