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Forward-declares a Core Foundation type. This includes the actual type and the ref type. For example, Q_FORWARD_DECLARE_CF_TYPE(CFString) declares __CFString and CFStringRef.
Forward-declares a mutable Core Foundation type. This includes the actual type and the ref type. For example, Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(CFMutableString) declares __CFMutableString and CFMutableStringRef.
Forward-declares an Objective-C classname in a manner such that it can be compiled as either Objective-C or C++.
This is primarily intended for use in header files that may be included by both Objective-C and C++ source files.
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