Add `CAF_HAS_MEMBER_TRAIT` macro
Add `CAF_HAS_MEMBER_TRAIT` macro

actor-framework/actor-framework,DavadDi/actor-framework,actor-framework/actor-framework,DavadDi/actor-framework,DavadDi/actor-framework,nq-ebaratte/actor-framework,actor-framework/actor-framework,nq-ebaratte/actor-framework,DavadDi/actor-framework,nq-ebaratte/actor-framework,actor-framework/actor-framework,nq-ebaratte/actor-framework