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typedef struct VideoFrameStruct {  
    void *address;
    int width;
    int height;
    int stride;
} VideoFrame;

void doSomethingWithFrame(VideoFrame frame);  

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let frame = VideoFrame(address: someAddress, width: 640, height: 480, stride: 8) // VideoFrame type
let frameWidth = frame.width // Int32 type
doSomethingWithFrame(frame: frame)

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#ifdef __cplusplus
extern "C" {  
#endif

void* makeObject(const char* storedValue);  
void setNewStoredValue(void* object, const char* newValue);  
const char* getStoredValue(void* object);  
void removeObject(void* object);

#ifdef __cplusplus

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class CppClass {  
public:  
    CppClass(const char* value) {
        storedValue = value;
    }
    const char* storedValue;
};

extern "C" void* makeObject(const char* storedValue) {  
    return (void*) new CppClass(storedValue);

bartlomiejn

class CppClass {  
public:  
    CppClass(const char* value) {
        storedValue = value;
    }
    const char* storedValue;
};

extern "C" void* makeObject(const char* storedValue) {  
    return (void*) new CppClass(storedValue);

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let object = makeObject(("Value" as NSString).utf8String) // UnsafeMutableRawPointer? type
setNewStoredValue(object, ("New value" as NSString).utf8String)
print(String(cString: getStoredValue(object)))	// New value
removeObject(object)

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final class SwiftCppClass {
    
    private let cppClass: UnsafeMutableRawPointer
    
    var storedValue: String! {
        get {
            guard 
                let currentValue = getStoredValue(cppClass), 
                let currentString = String(utf8String: currentValue) 
            else {

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@interface CppClassWrapper : NSObject
@property (nonatomic, copy) NSString* _Nonnull storedValue;
- (instancetype)initWithStoredValue:(NSString* _Nonnull)value;
@end

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@interface CppClassWrapper ()
@property (nonatomic) CppClass* cppClass;
@end

@implementation CppClassWrapper

- (void)setStoredValue:(NSString*) storedValue {
    self.cppClass->storedValue = [storedValue UTF8String];
}

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let cppClass = CppClassWrapper(storedValue: „Some value”)!
print(cppClass.storedValue) // Some value
cppClass.storedValue = „New value”
print(cppClass.storedValue) // New value