C++26 Contracts: Introduction to Preconditions and Postconditions
Summary
C++26 Contracts introduces preconditions and postconditions to C++, showing how to declare guards in declarations and definitions, plus the semantics of ignore, observe, enforce, and quick-enforce. The article covers practical examples, GCC integration, and cautions that contracts are not input validation and should avoid mutating predicates. It also explains how contracts interact with assertions and the differences from traditional runtime checks.