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Home/ Questions/Q 3998238
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T07:30:03+00:00 2026-05-20T07:30:03+00:00

I got 2 Protocol* object and want to check if they conform each other.

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I got 2 Protocol* object and want to check if they conform each other.

I use

BOOL protocol_conformsToProtocol(Protocol *proto, Protocol *other)

but it shows a warning

Implicit declaration of function ‘protocol_conformsToProtocol’

What do I miss?

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  1. Editorial Team
    Editorial Team
    2026-05-20T07:30:04+00:00Added an answer on May 20, 2026 at 7:30 am

    Are you including the right headers? I think protocol_conformsToProtocol is declared in <objc/runtime.h>.

    #include <objc/runtime.h>
    
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