C++26 Contracts: Introduction to Preconditions and Postconditions

C++26 introduces contracts, a new feature that allows developers to specify preconditions, postconditions, and invariants in their code. Preconditions are conditions that must be true when a function is called, while postconditions are conditions that must be true when a function returns. Invariants are conditions that must always be true throughout the execution of a function. This feature aims to improve code reliability and safety. The article provides an example of how to use contracts in C++26, including how to specify and enforce them.