10.11. 10.11 Using Macros in Different Source Files
Unlike procedures, macros do not have a fixed piece of code at some address in memory. Therefore, you cannot create "external" macros and link them with other modules in your program. However, it is very easy to share macros with different source files: Just put the macros you wish to reuse in a header file and include that file using the #include directive. You can make the macro will be available to any source file you choose using this simple trick.
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