The C++ Twilio REST SDK is a simplified library that makes it easier to interact with the Twilio REST API in C++. The library consists of several files, including Rest.cpp, TwiML.cpp, Utils.cpp, and Examples.cpp, which provide various functionalities such as validating HTTP request signatures, generating TwiML, and sending SMS messages. The SDK can be used to build a restaurant dish recommendation service that sends SMS recommendations, retrieve the list of sent SMS messages, and handle pagination. Laurent Luce has provided code examples demonstrating how to use the library to send SMS requests and responses, as well as retrieve the list of sent messages.