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General C++ Programming - February 2021 (Page 3)

writing a singly linked list to a file

Hello, I have the following singly linked list class: class singlylinkedlist1 { public: node* head; singlylinkedlist1() { head = NU...

[11 replies] Last: Ok, I am putting some of my code in summary (I didn't include the node... (by gevCplus)

by brim4

How to read a text file of varying line size into a data structure?

Hiya. I am attempting to read some data from a text file into an array. I noticed that I can not do it the traditional way as the names are of different lengths...

[3 replies] Last: An alternative take is to use a vector<int> for the marks so that any ... (by seeplus)

by sophia218

[HELP] how to read a file byte by byte

I want to open a gif file from the laptop and read it byte by byte to read the header and other sources contained in a file. I opened a file using the code belo...

[1 reply] : Something along these lines: #include <iostream> #include <fstream>... (by JLBorges)

by JUANDENT

How to deduce a native array in a template function?

Hi, I used to know this but I think I am just exhausted. I want something like this: template<int N, int array > static bool anyNonZero( int (arra...

[4 replies] Last: Thanks!!!! (by JUANDENT)

by VoB

On returning references to local objects and subscripting operator. (1,2)

I need a check about returning a reference. In particular, I have two questions. It's well known that we should never return references to local objects. F...

[31 replies] Last: Fair enough. (by helios)

by daytooner

virtual classes confusion

I have this design (the basic dreaded diamond): class base{ public: base(const char* label) : m_label(label){}; virtual ~base(){}; voi...

[2 replies] Last: Thanks, Ganado. After I read your reply, I found this as well @https:/... (by daytooner)

by Mitsuru

Pre-allocated memory data for parallel threading keeping locality

Dear experts I think this post seems ambiguous and case-by-case question. But, if you have know-how, I would appreciate it if you could help me. I think pro...

[6 replies] Last: Today, I did performance check in NUMA-arch machine (Xeon Gold) and no... (by Mitsuru)

by closed account 26q2b7Xj

How to take this Python code and convert it into C++: list(product([True, False], repeat=len(some list)]))

I've been thinking hard on this idea of how to replicate itertools.product. Any thoughts?

[6 replies] Last: the trouble is the problem is in a vacuum ... now that you generated i... (by jonnin)

by subhransu

Creating objects and downcasting them in the same line?

I am trying to create an object and downcast it in the same line. But I am getting errors with Child *cp= dynamic_cast <Parent *> new Parent(); #include<iostre...

[1 reply] : Of course it throws an error. A Parent is not a Child. You would like... (by keskiverto)

by Mitsuru

How does cache of function calls work?

Dear experts, I am now understanding how cache works, and suitable "data" structures (e.g. contiguous data array, stack memory region etc). Here, I am wonderi...

[8 replies] Last: Dear dhayden Thank you for your reply. I would like to be oblivious a... (by Mitsuru)

by EmanCS

min_element : returning all instance

Hi I have a list of structs the struct has fields a,b,f StructName struct1 = *min_element(myList.begin(), myList.end(),&ClassName::_compareObjectiveF); _com...

[1 reply] : Unless they happen to be ordered by f, it's not possible to return the... (by dutch)

by MitchJohnson

Socket Programming, Casting sockaddr_in to sockaddr. Why?

Here is a sample socket programming snippet from the client side. My question revolves around the type-casting that casted sockaddr_in into sockaddr. My questio...

[1 reply] : Use code tags when posting code. sockaddr is a generic structure that... (by dutch)

by frek

Infinite for loop

The question is, why the loop below falls into an infinite cycle. #include <iostream> void infinite() { unsigned char max = 160; // very large for ...

[5 replies] Last: 1) - Wrapping around 2's complement is the most likely scenario, whic... (by Ganado)

by Mitsuru

Hashing way of bounded non-sequential index for contiguous data structure

Dear experts I am amazed at performance promotion by using contiguous data structure (std::vector) instead of linked data structures. I often have no choice b...

[4 replies] Last: Dear JLBorges Thank you for your profound reply. I am willing to con... (by Mitsuru)

by Mitsuru

Best book or documents for vectorization (SIMD operations in) for C++

Dear experts I am studying the best way to use vectorization (SIMD), in order to achieve thread&SIMD parallelization as Intel proposes the potential of speed u...

[4 replies] Last: Dear keskiverto Thank you for your advice in auto-vectorization. At ... (by Mitsuru)

by nuderobmonkey

Final State Machine

I tried to code a traffic light. What I have so far is somewhat where I think, it could be a FSM. But I'm not sure about if it would be such. Also, I have some ...

[6 replies] Last: #include<iostream> #include<thread> #include<chrono> #include<windows... (by lastchance)

by gevCplus

Linked list in a linked list question

Hello, I want to implement a <<singly linked list in a singly linked list>> data structure. I coded my singly linked list but I find it difficult to make each ...

[4 replies] Last: @dutch: Thanks a lot! It didn't cross my mind at all to use templates!... (by gevCplus)

by opfabi

multiply the odd numbers from a file

hi, I am trying to multiply the odd numbers from a file using a recursive function and I don't quite know how, I've tried several times but it just doesn't work...

[4 replies] Last: #include <iostream> #include <fstream> #include <sstream> using names... (by lastchance)

by woohyeon

Multiple inheritance is bad?

I'm implementing a simple game, and I have a trouble with class architecture. Assume that you implement a object class, and you want to separate some feature. ...

[3 replies] Last: Thank you guys. I thought too that many people say something is bad, b... (by woohyeon)

by woohyeon

Enum type as a member variable.

Hi. When you use enum type as a member variable, what do you use for the member variable's real type? I mean, If you want a variable for a color, you will...

[13 replies] Last: jonnin // Thank you for your advice! I understood that I have to choos... (by woohyeon)

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