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Home/ Questions/Q 897251
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T14:51:24+00:00 2026-05-15T14:51:24+00:00

I want to define a macro which includes another header file like so: #define

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I want to define a macro which includes another header file like so:

#define MY_MACRO (text) #include "__FILE__##_inline.inl"

So that when the preprocessor parses file person.h, MY_MACRO(blahblah) expands to

#include “person.h.inline.inl”

any hints on how to do this ?

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  1. Editorial Team
    Editorial Team
    2026-05-15T14:51:25+00:00Added an answer on May 15, 2026 at 2:51 pm

    It’s not possible to use #define to construct other preprocessor directives, unless you run the preprocessor twice.

    But in your case even running the preprocessor twice won’t help because the #include must be a single string of the form "..." or <...>.

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