What would be better practice when giving a function the original variable to work with: unsigned long x = 4; void func1(unsigned long& val) { val = 5; } func1(x); or: void func2(unsigned long* val) { *val = 5; } func2(&x); IOW: Is there any reason to pick one over another? 12 Answers 12
I have an array int arr[5] that is passed to a function fillarr(int arr[]): int fillarr(int arr[]) { for(…); return arr; } How can I return that array? How will I use it, say I returned a pointer how am I going to access it? 19 Answers 19
This question already has answers here: What exactly is nullptr? (14 answers) Closed 8 years ago. I know that in C++ 0x or NULL was replaced by nullptr in pointer-based applications. I’m just curious of the exact reason why they made this replacement? In what scenario is using nullptr over NULL beneficial when dealing with … Read more
I came across this strange code snippet which compiles fine: class Car { public: int speed; }; int main() { int Car::*pSpeed = &Car::speed; return 0; } Why does C++ have this pointer to a non-static data member of a class? What is the use of this strange pointer in real code? 18 Answers 18
I am reading a book called “Teach Yourself C in 21 Days” (I have already learned Java and C# so I am moving at a much faster pace). I was reading the chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions … Read more
What is uintptr_t and what can it be used for? 5 Answers 5
This question already has answers here: Closed 10 years ago. Possible Duplicates: pimpl: shared_ptr or unique_ptr smart pointers (boost) explained Could someone explain differences between shared_ptr and unique_ptr? 4 Answers 4
The dot (.) operator is used to access a member of a struct, while the arrow operator (->) in C is used to access a member of a struct which is referenced by the pointer in question. The pointer itself does not have any members which could be accessed with the dot operator (it’s actually … Read more
There are already several Q&As on this “X does not implement Y (… method has a pointer receiver)” thing, but to me, they seems to be talking about different things, and not applying to my specific case. So, instead of making the question very specific, I’m making it broad and abstract — Seems like there … Read more
When should a double indirection be used in C? Can anyone explain with a example? What I know is that a double indirection is a pointer to a pointer. Why would I need a pointer to a pointer? 18 Answers 18
