Missing Header Files

Hello,
I'm programing my project while using the nrf52840 chip. I'm using segger embedded studio for the programming part because with the nrfconnect I have error code 9 "reading readback protection status for application core".
So I'm started coding but there is a certain type that is still unknown which is "NRF_STATIC_INLINE" and can't find the header file that contains it.

thanks for the help .

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