General C++ Programming - C++ Forum - September 2022 (Page 3)

by KaiTang

About function pointer as map's value

Hello everyone, like this code class A { public: A() {} void show() { } int a;...

[6 replies] Last: > Doing an explicit cast seems to work but not sure if it's guaranteed... (by JLBorges)

by seeplus

std::format_args

It is my understanding that std::format_args requires compile-time stated arguments. Is it possible ...

[4 replies] Last: Thanks. That's what I thought. This topic came up in conversations ove... (by seeplus)

by JUANDENT

why use std::decay?

Why is it necessary to use std::decay and std::forward here: template<typename T> auto f(T&& va...

[1 reply] : Roughly, std::decay a. removes cv-qualifiers, b. removes references,... (by mbozzi)

by johnstro12

Debug build but with STL optimized like release build

Is it possible to compile the application code I write in a "debug" version (i.e. with symbols, abil...

[4 replies] Last: @Peter87: _GLIBCXX_DEBUG was a really useful tip. Thanks (by kbw)

by JamieAl

Optimization: why is my Eigen code slow?

I just recently finished rewriting a code I had that used C++ arrays to include Eigen matrices inste...

[18 replies] Last: In addition EcalcPotSourcek_inertia doesn't do anything as far as I c... (by JamieAl)

by Cplusc

variable can't be defined in namespace

Hello forum, I defined a header file name Cell.h as bellow, #pragma once #ifndef _CELL_H_ #define ...

[2 replies] Last: Thanks for the answer. I appreciate it. (by Cplusc)

by denver2020

string issue

I am trying to solve the below problem. https://www.chegg.com/homework-help/questions-and-answer...

[10 replies] Last: Note that the sort order for treating the ids as strings or as numbers... (by seeplus)

by t im

Assign unsigned int to char

What will happen when assigning an unsigned int to char? Just as the code below: unsigned int nu...

[1 reply] : A prvalue of an integer type or of an unscoped (since C++11) enumer... (by JLBorges)

by Geckoo

Sound by algorithm

There is a way to generate sounds according to an algorithm. It's very weird, but interesting. At th...

[11 replies] Last: I didn't realize some orchestras tune their instruments to even higher... (by Ganado)

by Cambalinho

how convert position class to 'const POINT*'?

see my position class: class position { public: float X; float Y; float Z; float perespe...

[3 replies] Last: The operation you're specifying is on the collection, not the contents... (by kbw)

by raijin011321

C++ LinkedList explanation

Please explain to me how these codes work. That will make me easily understand. Line# 11,12,13,14 Li...

[3 replies] Last: This code originally came from this post https://cplusplus.com/forum/g... (by seeplus)

by JamieAl

How to create 3D matrix in Eigen

I am trying to build a 3D matrix in C++ using Eigen. I read online that instead of 3D matrix, I can ...

[10 replies] Last: @jonnin Thanks again. (by JamieAl)

by denver2020

c++ special characters

I am trying to solve the below using c++. Any idea how to display special characters using STL and o...

[16 replies] Last: Thanks everyone for your inputs,this thread can be closed. (by denver2020)

by denver2020

Buggy code

What is wrong in below code? class NonZeroSample{ protected: virtual intnxt = 0;...

[4 replies] Last: Thanks to clarify this. This thread can be closed. (by denver2020)

by raijin011321

C++, Popped off

Hello, how to allow the user to enter how many items to be popped off? Please check my codes. ...

[4 replies] Last: Oh thanks i got it. (by raijin011321)

by Tima11

I get an error when trying to get value from the class in another class.

Hello. I get an error when trying to get value from another class which are also in one big class. E...

[3 replies] Last: Thanks keskiverto! I experimented with your solution to this problem a... (by Tima11)

by ahmad alghadban

Strange error in string::substr

I'm solving a problem in codeforces link: https://codeforces.com/edu/course/2/lesson/2/3/practice/co...

[16 replies] Last: I was thinking of Barbara Gaskin's version from 1981. (by seeplus)

by jetm0t0

Quick question on for loops header

I keep forgetting how this works: for (T<ItemType>* tempPtr = headPtr; tempPtr; tempPtr = tempPt...

[2 replies] Last: Oh that's awesome, and powerful! It really is count controlled secretl... (by jetm0t0)

by raijin011321

Linkedlist in a Class

Hello, please help me how do I put these codes in a class (.cpp and header file) #include <iostr...

[8 replies] Last: Oh i see, its now working. Thanks a lot to those who help :D (by raijin011321)

by dorito200

For loop not iterating through array

Hey yall, got another question for everyone. I'm working on an assignment for class and I am trying ...

[16 replies] Last: yes, another great alternative. And, if you noticed, all the alternat... (by jonnin)

General C++ Programming - September 2022 (Page 3)

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