iostream-style output streams (cin, cout library for Arduino is included) locale support for formatting containers: vector, list, queue, and map optional PSRAM ...
This will not work with Arduino IDE 1.6.5 (or below) or with non ESP32-S2/S3 devices (e.g. Arduino UNO, Arduino MEGA, etc.). To use this library you need to have Arduino core for the ESP32 installed.