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General C++ Programming - February 2022 (Page 2)

I've made a class defining a list. I know STL has a list function but I went ahead and coded the whole thing. I want to make an array of linked lists and be ...

[7 replies] Last: The code looks to be "over-engineered" -- as well as missing several c... (by deleted account xyzzy)

by frek

packaged_task and future

In the code example below, everything "looks" fine, but why do I get a runtime Debug error: abort() has been called , please? #include <iostream> #include ...

[2 replies] Last: Thank you. :) I don't know why I'd forgot to call join there! Both jo... (by frek)

by Cplusc

build a solution after cloning from github

I cloned the palabos repository using "git clone https://github.com/gladk/palabos.git" into the working directory. Then I tried to build the solution to make in...

[2 replies] Last: Thanks for your answer. After many try and errores I used Ubuntu and g... (by Cplusc)

by deleted account xyzzy

C++ class inheritance, Visual Studio and modules

It looks like I found a bug in Visual Studio how it processes module code. Here's some non-module code that compiles and runs fine, a couple of class header fi...

[5 replies] Last: Add the default ctor and comment out the using statement in the modul... (by seeplus)

by quoiagrace

Rock, Paper, Scissors using enums and functions help!!

the requirements for this assignment are to use enums and functions and an option to play again. im pretty confuse on exactly what I am doing wrong. also extrem...

[3 replies] Last: Perhaps something like: #include <iostream> #include <random> #incl... (by seeplus)

by narada

trouble with boundary values for number guessing program

The assignment is to write a program that will correctly guess a generated number between 1 and 100. My program can correctly guess any number between 1 and 99....

[2 replies] Last: Small point but if number_generator() was called multiple times (say i... (by seeplus)

by NopeNoRoboHere

How to allow the user to "roll the dice" x times and save those values into a 2D array

Hey guys, I am currently working on tweaking a project for my class where we have to allow the user to roll dice (or generate random numbers 1-6) for a total o...

[7 replies] Last: I needed to save the output so that I could plug it into a separate fu... (by NopeNoRoboHere)

by frek

Meta Functions

As far as I know, metaprogramming is used in C++ for better performance. I tired to test and figure it out using the example code below: #include <iostream> #...

[16 replies] Last: A metaprogram is just a program whose input or output is another compu... (by mbozzi)

by frek

Condition(al) variable

What happens in this piece of code? #include <iostream> #include <string> #include <thread> #include <mutex> #include <condition_variable> std::mutex m; std...

[11 replies] Last: If by any coincidence, the operating system decides to give the worke... (by helios)

by gedinfo

JSonCpp - create a JSON file in C++

I have been tasked with creating functionality in C++(running on Linux) to create a JSON file. I have been able to create labels and data:pair for single eleme...

[3 replies] Last: nlohmann's json library can be used as a single #include (json.hpp). h... (by Ganado)

by deleted account xyzzy

C++20, std::format, address of variables and Visual Studio (1,2)

Following on from here: http://www.cplusplus.com/forum/lounge/282147/ to https://stackoverflow.com/questions/70712797/is-it-safe-to-bind-an-unsigned-int-to-a-si...

[25 replies] Last: Yes, I know. That is the sole reference I can find, online. (And I t... (by deleted account xyzzy)

by DeezyM89

Why is my code reading the last Line Twice

This program that i created is working, but it is reading the last line twice. Idk what I did wrong. #include <iostream> #include <fstream> #include <stri...

[4 replies] Last: If you're been told to use .good() within a loop (bad idea), then you ... (by seeplus)

by michaeljhuman

cassert and templates

In Visual Studio, code that compiles outside an assert, does not compile inside an assert. static_cast<_TupleVal<1, int>>(tup2).get() == 2 I am not sure w...

[2 replies] Last: assert is a function-like macro. Macros are expanded during the prepro... (by Peter87)

by SSDEEZ

fully iterating before termination

I want this code to keep iterating and check the whole string before terminating the while loop i have setup over this. the problem is that it terminates a...

[11 replies] Last: Take a look at the any_suit_contains_full_run and amend it for your pu... (by Ganado)

by Cplusc

Mpi 32 and 64 platform.

I have a vector or vector of type double and a vector of vector of size_t. I'm sending these vectors to different processors. My code is working as I expect in ...

[9 replies] Last: If you are using Visual Studio then you are presumably using the cl.ex... (by lastchance)

by zephina21

Activity using switch case

write a program that can compute the grades of the students from pre-mid, midterm, pre-final, final and get the average then identify the average is: below 74....

[11 replies] Last: #include <iostream> #include <initializer_list> int main() { doubl... (by seeplus)

by Adam87

Casting a structure to another

Hi, I have a structure that is allocated by malloc My first structure struct TEST_STRUCT { int ID; int x; int i; int y; int z; }; second structure s...

[8 replies] Last: My understanding is that you want to reinterpret a chunk of memory th... (by Adam87)

by BJKY0712

Is it possible to not define the size of a 2d array at the beginning?

I want to import coordinates from a csv file and i want to store those data in a 2d array or maybe vector. I dont know which one is more suited for my task. The...

[11 replies] Last: #include <iostream> #include <fstream> #include <string> #include <al... (by lastchance)

by frek

Bits manipulation

The size of this class is supposed to be 4 bytes: #include <iostream> struct PPN { // R6000 Physical Page Number unsigned int PFN : 22; // Page Frame Num...

[17 replies] Last: @Ganado Cool. Thanks for that :+) ThingsLearnt++; (by TheIdeasMan)

by deleted account xyzzy

C++20 - import vs. #include

I made a somewhat off-hand comment here, http://www.cplusplus.com/forum/general/282156/ , about importing C headers as modules, something the references I am s...

[11 replies] Last: I must modify somewhat my earlier expressed opinion about the "Beginni... (by deleted account xyzzy)

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