Expression templates in C++ optimize mathematical operations by representing expressions as types. They eliminate temporary objects, improve performance, and allow efficient code generation without sacrificing readability. Useful for complex calculations in scientific computing and graphics.
The observer pattern in C++ enables event-driven programming, creating responsive applications. It establishes a one-to-many relationship between objects, allowing automatic notifications when a subject's state changes, promoting loose coupling and modular code.
C++20 concepts enhance template programming, enabling cleaner, safer code. They specify requirements for template parameters, catch errors at compile-time, and improve error messages. Concepts allow more expressive code and constraint propagation.
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Template metaprogramming in C++ enables compile-time code generation, optimizing performance. It allows generic programming, type traits, and complex computations without runtime overhead, enhancing code flexibility and efficiency.