Recent questions tagged pointers

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pointers - Why should constructor of Go return address?

I understand that Go doesn't have any constructors and a New func is used in its place, but according ... of constructor or something. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - In C, why can't an integer value be assigned to an int* the same way a string value can be assigned to a char*?

I've been looking through the site but haven't found an answer to this one yet. It is easiest (for me ... object which the pointer points to? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Order of operations for dereference and bracket-ref in C

If I do *ptr[x], is that equivalent to *(ptr[x]), or (*ptr)[x]? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Reason why not to have a DELETE macro for C++

Are there any good reasons (except "macros are evil", maybe) NOT to use the following macros ? #define DELETE( ptr ) ... [] ptr; ptr = NULL; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Placement of the asterisk in Objective-C

I have just begun learning Objective-C, coming from a VB .Net and C# .Net background. I understand ... this perplexing question? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How to alias a function name in Fortran

Not sure if the title is well put. Suggestions welcome. Here's what I want to do. Check a condition, and ... might be implemented? Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Why is the return type of Deref::deref itself a reference?

I was reading the docs for Rust's Deref trait: pub trait Deref { type Target: ?Sized; fn deref(&self) -> &Self: ... <T> and &T, be written then? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How to printf a memory address in C

My code is: #include <stdio.h> #include <string.h> void main() { char string[10]; int A = -73; ... address in memory of the variable A. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How to include a dynamic array INSIDE a struct in C?

I have looked around but have been unable to find a solution to what must be a well asked question. Here is the code I ... of char s[] is the same as char* s Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - C: Which character should be used for ptrdiff_t in printf?

Which character should be used for ptrdiff_t in printf? Does C standard clearly explains how to print ptrdiff_t in printf? I haven ... = %?", diff); // % what? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Meaning of "referencing" and "dereferencing" in C

I read different things on the Internet and got confused, because every website says different things. I ... explanation about "referencing and dereferencing"? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How to cast self to UnsafeMutablePointer<Void> type in swift

Trying to pass "self" to a C function in swift, when calling following code: var callbackStruct : ... "self" to a UnsafeMutablePointer type here? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - how does the ampersand(&) sign work in c++?

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Why can't I convert 'char**' to a 'const char* const*' in C?

The following code snippet (correctly) gives a warning in C and an error in C++ (using gcc & g++ ... what would be the correct type for the parameter? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Swift 2 - UnsafeMutablePointer<Void> to object

If I have a method like: func someMethod(contextPtr: UnsafeMutablePointer<Void>) how do ... SCNetworkReachabilitySetCallback(reachability, callback, &context) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Why does the arrow (->) operator in C exist?

The dot (.) operator is used to access a member of a struct, while the arrow operator (->) in C ... unnecessary operator? What is the big design decision? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Why are references not reseatable in C++

C++ references have two properties: They always point to the same object. They can not be 0. Pointers are the ... of only when declared as const?" Cheers, Felix Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Is NULL always zero in C?

I was interviewing a guy for a mid-level software engineering position yesterday, and he mentioned that in C, ... already submitted my decision to my manager.) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Arrow operator (->) usage in C

I am reading a book called "Teach Yourself C in 21 Days" (I have already learned Java and C# so I am ... Could I please get an explanation and a code sample? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - When should I use the new keyword in C++?

I've been using C++ for a short while, and I've been wondering about the new keyword. Simply, should I ... and paste it to either a destructor or otherwise). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Deleting Objects in JavaScript

I'm a bit confused with JavaScript's delete operator. Take the following piece of code: var obj = { helloText: " ... way, my testing was done in Safari 4.) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Passing by reference in C

If C does not support passing a variable by reference, why does this work? #include <stdio.h> void f(int *j) { (*j)++; ... $ gcc -std=c99 test.c $ a.exe i = 21 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - returning a local variable from function in C

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - C++ delete - It deletes my objects but I can still access the data?

I have written a simple, working tetris game with each block as an instance of a class singleblock. class SingleBlock { ... Sorry if this is a bit long winded. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How to pass objects to functions in C++?

I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to ... also explain where to use each of those options. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - How come an array's address is equal to its value in C?

In the following bit of code, pointer values and pointer addresses differ as expected. But array values and addresses don't! ... ... "); getchar(); return 0; } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Calculate the order of B+-Tree

I am trying to calculate the order of my B+-Tree for a SSD with Page size 8KB. I know that the least ... :https://stackoverflow.com/questions/65838115/calculate-the-order-of-b-tree...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pointers - Returning an empty item in a C function call

I want to return the last in a stack. Something like the following: Item* get_last_item() { if (item_stack_size ... questions/65852550/returning-an-empty-item-in-a-c-function-call...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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