General C++ Programming - C++ Forum

I have a inpu.dat binary file. I have to read this and assign the elements in it to a matrix. How can I do this? Thanks

[4 replies] Last: A C-style array type contains its dimensional information which sizeof... (by dutch)

I will be very a happy if anyone can assist me Suppose we want to compile a student academic report for a high school learner in grade 12 (matric). A mat...

[3 replies] Last: I great technique for doing assignments like this is to copy the list ... (by dhayden)

by LauriePearson

How to program games like Project QT

Hello friends. I am new to game programming. So many things are still unclear. Can someone show me the basic steps on how to program a quality game like Project...

[2 replies] Last: Some simple text games might be instructive and fun: High-low: The co... (by dhayden)

by TheToaster

[SOLVED]Spinlock mutex not working with std::scoped_lock or std::lock_guard

I can call lock and unlock manually around the critical region and it works fine, but when I wrap it with a scoped_lock I still get a data race: #include <at...

[no replies]

by kohit

how to use a different type to find value in std::set

I have a struct like: struct point{ int f; int b; point(){} point(int u, int v){ f = u; b = v; } bool operator<(const p...

[4 replies] Last: I was confused, if I have a key_type value with the key I need(such a... (by keskiverto)

by lumbeezl

How to use Boost in Visual Studio/Qt

To make a long story short, I need to use boost for various reasons. Anyways, I've searched and searched for an extremely simple way to use Boost in Visual S...

[6 replies] Last: @malibor thank I really appreciate it and benefit of it.. (by marhuum)

by closed account jGAShbRD

functions help

i wanted to make a function and then checks if the user reboot or not. and in the int main function i want to call from that function. the code i have so far is...

[1 reply] : support's return type is void. That means it doesn't return any value.... (by Ganado)

by eladb

TCL shell fron CPP

hello gents, I would like to open TCL shell from CPP progrem. I have no idea how can it be done, do spmeone have any idea or some examples that can give m...

[11 replies] Last: I am not sure why you have been getting the answers you are getting...... (by Duthomhas)

by AlessandroTZ

List with multiple template (1,2)

Good evening to everyone, I'm opening this topic because i need to solve a problem with templates in lists. I need to create a list which can contain for ea...

[29 replies] Last: To clear exactly what i'm doing with template_variable i should post h... (by AlessandroTZ)

by wc skya

different types to ?: operator

namespace { struct Base {}; struct Derived: Base {}; } int main() { Base a; Derived b; Derived *p = &b; const Derived *c = &b; bool s = f...

[4 replies] Last: Are you saying const Derived can not be directly converted to Base ... (by dhayden)

by TheToaster

Understanding std::memory_order_release and std::memory_order_acquire

Please consider the following example code: #include <atomic> #include <thread> #include <cassert> std::atomic<int> data ; std::atomic<bool> sync1(false),sync...

[3 replies] Last: My previous post was exclusively in response to this question: can th... (by helios)

by jp101invert

request for member '', which is of non-class type

I am trying to build a struct array and input the different attributes to that struct array with a loop but I am being prompted with an error message saying "re...

[1 reply] : s is an array of water_bottle objects, not an individual water_bottl... (by Ganado)

by thmm

dlib::timer crashes

I am playing around with the dlib library. The following code crashes in DEBUG build, but works fine in RELEASE build. Using VS 2017 CE 15.9.23 Anything I co...

[2 replies] Last: I added t.stop() at the end of main, but still the same behavior. (by thmm)

by Odglog

How to remove spaces between lines?

Hi, I hope you have a good day :) I was wondering if removing spaces between lines is possible, lets say I have this code: #include <iostream> int mai...

[10 replies] Last: Odglog, you also don't necessarily need to use OpenGL for text renderi... (by Ganado)

by TheToaster

C++ memory orderings

I just learned about memory orderings today, and I'm not sure I fully understand it. Basically the standard library provides six std::memory_order enumerators t...

[3 replies] Last: It looks like it deals with details of parallel processing and optim... (by TheToaster)

by TheToaster

Using Generic Lambdas for SFINAE

In C++ Templates, The Complete Guide (2e), the author gives the following example trait definition template<typename F, typename... Args, typename = decltype...

[4 replies] Last: Ahh that makes sense. Thank you. (by TheToaster)

by Magplusplus

comparing two substrings

Hi guys below is my code...so am trying to read for the input file then compare a specific part of a string using their substrings input file format is: M...

[6 replies] Last: Inside the while loop you check if num1 == 0 (by Thomas1965)

by JUANDENT

Does Liskov Substitution Principle (LSP) conflict with public inheritance's IS-A semantics?

Hi, LSP states that if a function's parameter type is pointer or reference to Superclass, then providing an object from a Subclass should not break the code....

[3 replies] Last: So, it appears that Square IS-NOT-A rectangle... No, class square I... (by Repeater)

by closed account Ey80oG1T

What's the best way to create a n array of classes?

So I have two classes, A and B. And I want to create an array of A in B. What's the best way to do this? Should I just create an array normally like this: ...

[1 reply] : Who cares? Yes indeed, who needs to know about A? If the answer is " ... (by keskiverto)

by JUANDENT

fold expression does not work when using std::unique_ptr<>

Hi, The following code will not compile - in particular the traverse() function. I get this error Error C2296 '->*': illegal, left operand has type 'st...

[2 replies] Last: great solution!! Thanks! Juan (by JUANDENT)

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General C++ Programming - May 2020 (Page 3)