Macros and constexpr are different features of C++ that serve different purposes. Macros are commonly used to define constants, perform conditional compilation, add debugging information, and generate code programmatically. Macros are still preferred over constexpr in certain situations because they are more flexible, compatible with older compilers, and can use preprocessor features. Macros can be error-prone and difficult to maintain, especially in large codebases. It's important to use macros judiciously and consider other alternatives where appropriate.
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