How do I write headers that compile as C and C++?

Writing headers that compile as both C and C++ requires using feature checks and ensuring that your code conforms to both languages' standards. The C++ standard allows C headers to be included directly, provided they are properly guarded.

The typical way to create a header that can be included in both C and C++ is to use `#ifdef __cplusplus` preprocessor directives. Here’s an example:


        #ifndef MY_HEADER_H
        #define MY_HEADER_H

        // C compatible declarations
        void my_function();

        #ifdef __cplusplus
        // C++ specific declarations
        class MyClass {
        public:
            void myMethod();
        };
        #endif

        #endif // MY_HEADER_H