Questions about C++, a statically typed, free-form, multi-paradigm, compiled, general-purpose programming language.

learn more… | top users | synonyms

3
votes
5answers
1k views

Boundary conditions for testing

Ok so in a programming test I was given the following question. Question 1 (1 mark) Spot the potential bug in this section of code: void Class::Update( float dt ) { totalTime += dt; ...
2
votes
1answer
236 views

Any OOP design pattern that is somewhat representative of all of the SOLID OOP design principles at play?

I'm trying to teach an object oriented design principles course (on SOLID) at a training institute. I also want to teach the students a few OOP design patterns such as factory, singleton and one ...
4
votes
3answers
4k views

Is it important to obfuscate C++ application code?

In the Java world, it seems to sometimes be a problem, but, what about C++? Are there different solutions? I was thinking about the fact that someone can replace the C++ library of a specific OS ...
1
vote
7answers
696 views

Where is the 'this' variable stored?

Let's take this simple c++ program as an example: #include <vector> class A { void fun() { a = this + 1; } A* a; }; main() { std::vector<A> vec; vec.resize(100); } Forgetting ...
0
votes
2answers
285 views

Mobile App Development-Architecture/Platform: Main performance concern: device/UI responsiveness [closed]

I am currently investigating different alternatives for building a mobile instant messaging application for iOS and Android, using an XMPP server (probably ejabberd) as the back-end. Main requirements ...
-2
votes
1answer
119 views

OOP and Data Structures in C++? [closed]

Is it a must to study Object Oriented Programming before going into Data Structures in the C++ language or can I begin with lists, stacks ,queues,sorting ......etc and does Object Oriented Programming ...
3
votes
2answers
186 views

Are there alternatives to using an optional type in a multithreaded environment?

I'm making an MPMC queue in C++, and I would like to find out what the best interface for a try_dequeue method would be (I'm not concerned about its implementation). I'd like to provide a method which ...
1
vote
3answers
667 views

Is this a good design in C++?

Is it a good idea to replace getters and setters with a single function returning a reference? For example, instead of this, class Person { std::string name; public: std::string GetName() { ...
1
vote
2answers
817 views

2D linked list vs. multidimensional array/vector

I hope that programmers is the correct stack exchange for this, as it is quite a concept based question. I'm working on a data structure in C++ that is a represents data in 3D space. The x-y plane is ...
1
vote
1answer
131 views

Multithreaded Pre/Post Functions

I'm programming an application for an embedded device. We are using an RTOS that supports multi threading. The device is supposed to mimic an older project that was programmed in plain C (without ...
3
votes
2answers
186 views

On concatenating adjacent string literals

C and C++ compiles adjacent string literals as a single string literal. For example this: "Some text..." "and more text" is equivalent to: "Some text...and more text" In other languages like C# ...
2
votes
1answer
86 views

class hierarchy with structurally different subclasses

I want to implement a protocol layer which sits on top of the TCP/IP stack. There is a limited set of PDUs that can be sent and for each PDU there is a class which represents it in a structured form. ...
1
vote
1answer
164 views

How should a GUI application written in WinAPI be structured and organized? [closed]

I've done an extensive amount of GUI programming in Winforms and WPF using C#, and a tiny bit in C++ using MFC. I'm building a personal project using WinAPI mainly to gain a deeper knowledge in ...
0
votes
2answers
110 views

C++ Data Server and J2ME client communication [closed]

I am working on a robot that has some AI built in. However, the mandated robot controller does not have the power to do the work onboard. This means that I need to use a co-processor. I am writing ...
2
votes
1answer
154 views

Best practice for unused inherited virtual functions (implementing superclass methods)

Let's assume I have a hierarchy of several classes each derived from each other using virtual functions. The base class acts as an interface and defines functions, which may not be required by all of ...
-2
votes
1answer
115 views

Uniqueness of for loop [closed]

How does the for loop function is implemented so that it can accept ; as parameter separator rather than , which is trivial in normal functions.
4
votes
1answer
361 views

Why did GCC switch from Bison to a recursive descent parser for C++ and C?

Was there a language change that required it or some practical reason why Bison was no longer appropriate or optimal? I saw on wikipedia that they switched, referring to the GCC 3.4 and GCC 4.1 ...
2
votes
1answer
94 views

Drawing a custom rendered control in Windows - resizing

Some background: in order to learn GUI programming and drawing in Windows I'm starting to create my own GUI toolkit in Windows (so this is a didactic exercise, please don't suggest "use Qt" or "use ...
3
votes
7answers
2k views

Why do we need to include the .h while everything works when including only the .cpp file?

Why do we need to include both the .h and .cpp files , while we can make it works with making just a .cpp file and then including it . For example, Creating a file.h containing declarations, then ...
0
votes
1answer
220 views

Cheerp — C++ for web: advance or regression? [closed]

Recently I've run into Cheerp, a C++ to Javascript compiler, which uses a modified version of clang to generate Javascript code from C++ sources. That makes me wonder: why in the seven kingdoms would ...
3
votes
1answer
239 views

Is my class structure good enough?

So I wanted to try out this challenge on reddit which is mostly about how you structure your data the best you can. I decided to challenge my C++ skills. Here's how I planned this. First, there's ...
18
votes
14answers
3k views

University teaches DOS-style C++, how to deal with it [closed]

I had been programming for many years but wanted a diploma to make myself more employable. Having already been through university once, I didn't choose a full 5 year computer science major but a ...
5
votes
2answers
401 views

C++ Without Source Files

Bjarne Stroustrup mentions in his book "The C++ Programming Language, 4th Edition" that not all C++ implementations use files to store and compile code: There are systems that do not store, ...
23
votes
8answers
2k views

Interface design where functions need to be called in a specific sequence

The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at ...
-2
votes
1answer
202 views

What are steps in making an operating system in C ? [duplicate]

I am trying to make an my own OS. This is for educational purpose only, so that I get to understand the internals as well as get a good idea of low level programming. I have some prior application ...
17
votes
13answers
4k views

Why do operating systems do low level stuff in C and C++? Why not just C++?

On the Wikipedia page for Windows, it states the Windows is written in Assembly for the bootloader and task switcher, and C and C++ for kernel routines. IIRC, you can call C++ functions from an ...
3
votes
1answer
115 views

Augmenting functionality of subclasses without code duplication in C++

I have to add common functionality to some classes that share the same superclass, preferably without bloating the superclass. The simplified inheritance chain looks like this: Element -> ...
2
votes
4answers
217 views

How to refactor a myriad of similar classes

I'm faced with similar classes A1, A2, ..., A100. Believe it or not but yeah, there are roughly hundred classes that almost look the same. None of these classes are unit tested (of course ;-) ). Each ...
8
votes
2answers
322 views

Is NAN suitable for communicating that an invalid parameter was involved in a calculation?

I am currently working on a numerical processing system that will be deployed in a performance-critical environment. It takes inputs in the form of numerical arrays (these use the eigen library, but ...
1
vote
1answer
227 views

Implementation of instance testing in Java, C++, C#

For curiosity purposes as well as understanding what they entail in a program, I'm curious as to how instance testing (instanceof/is/using dynamic_cast in c++) works. I've tried to google it ...
-2
votes
2answers
110 views

Does a custom scripting language require it's own compiler/assembler? [closed]

Or is the script generally converted to a known language such as C++ first? And how generally to you integrate a scripting language with the say a game engine?
9
votes
5answers
960 views

Are there technical limitations or language features that prevent my Python script from being as fast as an equivalent C++ program?

I'm a long-time Python user. A few years ago, I started learning C++ to see what it could offer in terms of speed. During this time, I would continue to use Python as a tool for prototyping. This, it ...
13
votes
10answers
2k views

What is the best aproach for coding in a slow compilation environment

I used to coding in C# in a TDD style - write/or change a small chunk of code, re-compile in 10 seconds the whole solution, re-run the tests and again. Easy... That development methodology worked ...
1
vote
2answers
175 views

Is it an anti-pattern to use void* and enums to enable type-checking?

Say in a game engine, you have Objects that composited of different components. One of these is a RenderComponent which can be either a Mesh, a Sprite or a Light. Now, all these are vastly different ...
1
vote
1answer
145 views

In C++, are acquire-release memory order semantics transitive?

According to cppreference, we can use release-acquire semantics to ensure write-read precedence between two threads as follows: // Thread A 1. Write to X 2. Atomic store to Y with ...
6
votes
3answers
735 views

Is it bad idea to use flag variable to search MAX element in array?

Over my programming career I formed a habit to introduce a flag variable that indicates that the first comparison has occured, just like Msft does in its linq Max() extension method implementation ...
2
votes
3answers
288 views

Trying to get a better understanding of object-oriented design's performance pitfalls

I'm currently in a high-performance computing class taught in C++. Usually, I do work in C#, meaning everything is taken care of for me, and optimization comes behind maintainability and higher-level ...
-2
votes
2answers
59 views

Know executables files launched/loaded by an executable file [closed]

I would like to know any executable files launched or loaded by an executable file (if possible without running it,if it is not possible i don't want any change in the system). For example i have ...
0
votes
5answers
284 views

Should we only catch in exceptional circumstances?

Whether error handling by throwing exceptions is good or bad is contentious. Are exceptions as control flow considered a serious antipattern? If so, Why? The common line is that exceptions are for ...
-4
votes
1answer
174 views

Calculate Pi to N number of places [closed]

I am trying to work out how to calculate Pi to N decimal places, I think the default DP's for a float/double is 5 and then you have setprecision() however these are obviously inadequate, I need ...
12
votes
3answers
651 views

Debugging memory corruption

First off, I do realize this is not a perfect q&a style question with an absolute answer, but I can't think of any wording to make it work better. I don't think there is an absolute solution to ...
-4
votes
1answer
108 views

Unable to understand linked list example [closed]

Could someone please explain this code to me.. #include <iostream> using namespace std; struct link { int data; link* next; }; class linklist { private: link* first; ...
-2
votes
3answers
150 views

Distributed game development and security of source code

I think this question has already been asked many times, but I can't find any of them. I have a game project (I'm using Marmalade),and a few trusted developers, but I want to invite more. For adding ...
-5
votes
2answers
754 views

How does std::string in c++ allocate memory? [closed]

I've noticed that the string library doesn't require one to allocate space before writing the input/output. How does the string library allocate that memory dynamically, i know of the 'new' keyword in ...
1
vote
2answers
1k views

Is this proper OO design for C++?

I recently took a software processes course and this is my first time attempting OO design on my own. I am trying to follow OO design principles and C++ conventions. I attempted and gave up on MVC for ...
14
votes
10answers
4k views

Why are inheritance and polymorphism so widely used?

The more I learn about different programming paradigms, such as functional programming, the more I begin to question the wisdom of OOP concepts like inheritance and polymorphism. I first learned ...
1
vote
1answer
125 views

Pulling results from postgresql with cursors

I'm writing an application in C++ using libpq as the interface to postgresql. I'm currently putting together a small library of helper functions to help deal with the conversion from C++ to C for an ...
2
votes
3answers
254 views

C/C++: Which conversion warnings make sense in practice?

C/C++ implicit conversions can cause bugs. Here's one example: int foo, bar; scanf("%d", &foo); scanf("%d", &bar); float foobar = foo / bar; If I input 7 and 2, it's not 3.5 as expected - ...
25
votes
6answers
11k views

Programming language usage at Google [closed]

I have heard Google uses Python, Java and C++. But what I don't know is how is each of those programming language is used. I mean what is Python, Java and C++ is used for at Google. Why would they ...
51
votes
10answers
3k views

Why do we have postfix increment?

Disclaimer: I know perfectly well the semantics of prefix and postfix increment. So please don't explain to me how they work. Reading questions on stack overflow, I cannot help but notice that ...