Compile Objective-Cpp Code (Mac)

objectivecpp_helloworld.cpp

```
# -lstdc++ links against the cpp std lib
# -framework Foundation includes the Objective c(pp) foundation
# -fobjc-arc Enables ARC
clang -lstdc++ -framework Foundation -fobjc-arc main.mm -o hello
./hello
```

```objective-c
// main.mm
#import <iostream>
#import <Foundation/Foundation.h>

class Bob {
public:
    Bob() {
        NSLog(@"Bob");
        std::cout << "Bob" << std::endl;
    }

    ~Bob() {
        NSLog(@"~Bob");
        std::cout << "~Bob" << std::endl;
    }
};

class Alice {
public:
    Alice() {
        NSLog(@"Alice");
        std::cout << "Alice" << std::endl;
    }

    ~Alice() {
        NSLog(@"~Alice");
        std::cout << "~Alice" << std::endl;
    }
};

@interface BobbyC: NSObject {
 Bob *ptr;
 Alice Alice;
}

- (id)init;
// - (void)dealloc;
@end

@implementation BobbyC
- (id) init { 
    NSLog(@"init BobbyC");

    self = [super init]; 

    ptr = new Bob(); 
    return self; 
}

- (void) dealloc { 
    NSLog(@"dealloc BobbyC");
    delete ptr;
}
@end

class Wallace {
public:
    Wallace() {
        std::cout << "Wallace" << std::endl;
        this->bobby = [[BobbyC alloc] init];
    }

    ~Wallace() {
        std::cout << "~Wallace" << std::endl;
    }

private:
    BobbyC* bobby;
};

int main() {
    // Auto release behavior
    @ autoreleasepool {
        BobbyC* bobby = [[BobbyC alloc] init];

        // bobby is 'released' here.
    }

    // Default destructor behavior works.
    {
        Bob b;
        Wallace w;

        // Wallace destructor calls release on it's BobbyC member
    }

    return 0;
}
```

This program produces the following output.

```                                                     
2021-11-25 18:38:09.028 hello[76243:1828134] Alice
Alice
2021-11-25 18:38:09.029 hello[76243:1828134] init BobbyC
2021-11-25 18:38:09.029 hello[76243:1828134] Bob
Bob
2021-11-25 18:38:09.029 hello[76243:1828134] dealloc BobbyC
2021-11-25 18:38:09.029 hello[76243:1828134] ~Bob
~Bob
2021-11-25 18:38:09.029 hello[76243:1828134] ~Alice
~Alice
2021-11-25 18:38:09.029 hello[76243:1828134] Bob
Bob
Wallace
2021-11-25 18:38:09.029 hello[76243:1828134] Alice
Alice
2021-11-25 18:38:09.029 hello[76243:1828134] init BobbyC
2021-11-25 18:38:09.029 hello[76243:1828134] Bob
Bob
~Wallace
2021-11-25 18:38:09.029 hello[76243:1828134] dealloc BobbyC
2021-11-25 18:38:09.029 hello[76243:1828134] ~Bob
~Bob
2021-11-25 18:38:09.029 hello[76243:1828134] ~Alice
~Alice
2021-11-
```

ARC Stuff
https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/MemoryMgmt.html#//apple_ref/doc/uid/10000011i

Bob can also be a non-pointer member in BobbyC
```objective-c
@interface BobbyC: NSObject {
 Bob bob;
}
```

What is frameworks?
    https://stackoverflow.com/questions/15311263/does-gcc-clangs-framework-option-work-on-linux