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__cplusplus is not defined in .h files

DS1

when I test the __cplusplus version in the .cpp, keil uvison shows the correct one

But, when I test it in the h. file, keil uvison  doesn't show the same version as in .cpp .

code:

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#if (__cplusplus < 201103L)
#define MY_TEST_H 0 // greyed out in .cpp file
#endif
#if (__cplusplus >= 201103L)
#define YOUR_TEST_H 11 // greyed out in .h file
#endif
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