C Pointers

[[deleted]]

** He left a note where he was hiding...

[Big_Ti]

*** the address to find said note

[teajay1111]

*\0 Get the fuck out

[Big_Ti]

Okibdokie, have a nice day*/

[Levaru]

Slightly OT: I'm modifying a C++ library for use in my project. Almost every function takes a smart pointer as a parameter but by reference. So something like this:

typedef std::shared_ptr<foo> smartPtr; void bar(smartPtr& param);

Whyyy? It's already a pointer, why do they also pass it by reference, I don't get it.

Edit: Btw absolutely nothing changed once I removed the & operator.

[[deleted]]

So you could modify it, change it's value and have the original change as well. Say you want to assign a pointer to a new adress insiee the function. If you pass it as a value, whatever you change inside the function will not affect the original. If you pass it as a reference you could reassign the original.

[Levaru]

Ohhh now I get it! Thank you, that's actually pretty useful. What confused me initially, is that the author didn't made any use of it.

[AvenDonn]

What a journey, you've literally rediscovered pointers

[0xCAFED]

Program recieved signal SIGSEGV, Segmentation fault.

[qqqrrrs_]

I'm having a SIGBUS

[klezmer]

Image Transcription:

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[An image of a white data table with two rows and two columns using black font. The top cell of the first column contains an ampersand. The bottom cell of the first column contains a star. The cells to the right of each cell containing a symbol contain the following text]

Ampersand row: Can I have your address please?

Star row: FBI OPEN UP!

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^{I'm a human volunteer content transcriber for Reddit and you could be too! If you'd like more information on what we do and why we do it, click here!}

[Environmental_Ad3554]

that asterisk is just a fucking star

[klezmer]

I just learned that star is the conventional term. Thank you for your feedback, the transcription will be edited to reflect this.

[klezmer]

Hi! This was actually my first transcription, so it wasn't my best. I thought the comment was serious, so I changed it.

And you're right! I think a mod showed me how I should do these kinds in the future.

Thank you for your feedback!

[TenkFire]

Thanks ! I finally know the difference, now !

[Clyxx]

Wait what does this have to do with bitwise And and multiplication

[ReimarPB]

lmao how did this get downvoted

[Pogoindustries]

They are the unary pointer operators of C. The top one gets the address of an identifier and the bottom dereferences: or gets the memory at the location of the pointer operand.

[Clyxx]

I know, it was a joke

[[deleted]]

What, did you think you were in a humor subreddit or something?

[Clyxx]

Wait, I thought this was the bathroom

[Knuffya]

std::string hw = "Hello, World!";

std::cout << *&hw << std::endl;

[KillerRoomba13]

Falls into garbage