Recent questions tagged Pointers

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pointers - UnsafeMutablePointer<Int8> from String in Swift

I'm using the dgeev algorithm from the LAPACK implementation in the Accelerate framework to calculate eigenvectors and ... do to solve this? 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 create and allocate a C buffer as part of an objective C class

best to explain with an example: in my AudioItem.h #define ITEM_CAPACITY 100 typedef struct DataStruct { void ... down my real time application 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 - Does C have an equivalent of std::less from C++?

I was recently answering a question on the undefined behaviour of doing p < q in C when p and q are ... I could have easily missed something. 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 - Use const wherever possible in C++?

As stated in book Effective C++: "Use const whenever possible.", one would assume that this definition: ... .html Thanks in advance! 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 - Kotlin function parameter: Val cannot be reassigned

I have written Red-black tree in Kotlin. Fun insertFixup restores balance after inserting new element (z: Node? ... solution in your replies. 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 - Test for nil values in nested stucts

I have a deeply nested struct in go. These are constructed by a json unmarshaller. Quite some fields in this ... and speed is of concern. 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 - What does having two asterisk ** in Objective-C mean?

I understand having one asterisk * is a pointer, what does having two ** mean? I stumble ... executeAndReturnError:(NSDictionary **)errorInfo 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 - Copy an array reference in VBA

Is there any way to copy an array reference in VBA (or VB6)? In VBA, arrays are value types. Assigning one ... same scope as an existing one. 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 - C++: difference between ampersand "&" and asterisk "*" in function/method declaration?

Is there some kind of subtle difference between those: void a1(float &b) { b=1; }; a1(b); and void a1( ... it's some object instead of float? 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 - Meaning of '&variable' in arguments/patterns

What does &variable mean when it is used in patterns or closure arguments? for &code in self.exit_code.iter() { ... ... ), but I'm not sure. 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 - C++: Why is const_cast evil?

I keep hearing this statement, while I can't really find the reason why const_cast is evil. In the following example ... you for any efforts :) 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 - C++ inserting unique_ptr in map

I have a C++ object of type ObjectArray typedef map<int64_t, std::unique_ptr<Class1>> ObjectArray; What is ... an object of type ObjectArray? 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 print member function address in C++

It looks like std::cout can't print member function's address, for example: #include <iostream> using std::cout; ... 's address using std::cout? 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 - What does this C statement mean?

I came across this line: void (*(*x)(void (*[10])(int *)))(int *) Can anybody tell me what it is? 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 does Go forbid taking the address of (&) map member, yet allows (&) slice element?

Go doesn't allow taking the address of a map member: // if I do this: p := &mm["abc"] // ... special about taking address of slice element? 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 - What is ** in C++?

I've seen some code, as well as some errors generated from my compiler that have a '**' token before ... pointer to the original pointer? 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 - Understanding and relationship between Box, ref, & and *

I'm a bit confused about how pointers work in Rust. There's ref, Box, &, *, and I'm not sure how ... common use cases that I haven't mentioned. 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 - Meaning of *& and **& in C++

I found these symbols in a function declaration several times, but I don't know what they mean. Example: void raccogli_dati( ... = V[j][i]; } 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 check if two variables point to the same object in memory?

For example: struct Foo<'a> { bar: &'a str } fn main() { let foo_instance = Foo { bar: "bar" }; let ... in the memory Is it possible to do that? 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 - allocate matrix in C

i want to allocate a matrix. is this the only option: int** mat = (int**)malloc(rows * sizeof(int*)) for ( ... int*)malloc(col * sizeof(int)); } 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 print variable addresses in C?

When i run this code. #include <stdio.h> void moo(int a, int *b); int main() { int x; int *y; x = ... int *' Could you help me? Thanks blargman 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 - C Warning: Function returns address of local variable

The function below takes the argv[0] argument that contains the calling path of the application and replaces the ... ); return bidbotPath; } 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 doesn't reference-to-member exist in C++?

In C++ I can chose between function pointers and function references (or even function values for the sake of ... reason they do not exist? 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 - What does "void *(*)(void *)" mean in C++?

It's the parameter in pthread_create(). I think each part means: void *: The return value is a void pointer. ... a parameter. Is that correct? 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 - Dereferencing a map index in Golang

I'm learning Go currently and I made this simple and crude inventory program just to tinker with structs and ... statement in the driver.go See Question&Answers more detail:os...

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

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