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

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2
votes
1answer
78 views

Expandable alternative to Visitor pattern for tree traversal?

I have a tree containing various subtypes of the my base node class. I now want to traverse this tree and do something with the nodes depending on their type. The most straightforward idea is to just ...
1
vote
1answer
80 views

OO Design: Algorithm changing State (Information Flow Question)

I have a class Context, which contains an instance of an abstract class State, which has multiple concrete subclasses (this is an implementation of the State Pattern). Each State subclass executes a ...
1
vote
3answers
525 views

CRM in the context of C++ programming

I was asked by an employer about CRM in the context of C++ software development. The position I was applying for was C++ Software Engineer. I told them: As far as I know, CRM is an acronym that ...
1
vote
4answers
625 views

How should I deal with nested compositions?

I came across the following question on a website for interviews: Here are 3 products: table, chair and bench. Product can be of material: wood, metal, and plastic. Design class structures for ...
3
votes
2answers
99 views

How to setup build system for unit testing + mocking?

We have a legacy code base in entirely C++. Our build system is CMake. My first stab at unit testing was as follows: Define a target (LibraryA). This library contains the code to test. Define a unit ...
6
votes
2answers
1k views

What is the difference between function() and function(void)?

I have heard that it is a good practice to write functions that do not receive anything as a parameter like this: int func(void); But I hear that the right way to express that is like this: int ...
-1
votes
0answers
82 views

reinterpret_cast< > from one structure to another [migrated]

I'm going through a win32 program and I found part of a code contained reinterpret_cast<> from one structure to another. What happens to PKT_HEADER* pPktHeader = ...
0
votes
0answers
81 views

audio file processing in C++

I thought of the following project that I want to pursue: I want to create a C++ program, that can play audiofiles and visualize the amplitudes of individual frequency bands in real time (e.g. with ...
0
votes
2answers
75 views

Multiple threads making call to precompiled library

I have been asked this question in an interview and I thought to take advice from you guys. Say I have a pre-compiled library which references to some function say "strtok". There is no source code ...
1
vote
0answers
75 views

C++ Template Equivalence of Prototypes [migrated]

The following compiles runs and executes as expected: #include <cstdlib> #include <cstring> #include <iostream> #include <type_traits> class Freaky { public: template< ...
0
votes
0answers
39 views

Why we always have to use fgetc command in C programming instead of fscanf which do the same thing but prints strange results? [migrated]

In C programming whenever I use fgetc(file) to read all the chars until the end of the file it works. But when I use the similar fscanf(file,"%c") function it doesn't works. For example: File ...
0
votes
1answer
546 views

Interface questions for using Command Pattern and Dependency Injection together

I have many projects that have essentially the same high level requirement: test all hardware on a device. Each device can have a different communication protocol, requires different test equipment to ...
-2
votes
0answers
19 views

Instance Variables Not Updating [migrated]

When I run my little game, battle commences but after every turn, the players attack but health doesn't go down (i.e. the game never ends and it keeps printing the same health over and over). I know ...
0
votes
1answer
76 views

Const and non-const methods, and possible mutable data member?

I'm working on a design and implementation change due to a bug. The bug fix requires us to modify a class object in a const method. I think the two options are: Have the non-const method cast this ...
1
vote
0answers
87 views

Best software architecture for an efficient network tunneling in C++

Before jumping to my questions, let me explain my project's background. I am part of a team that organize the network of a famous LAN event. Most of the games nowadays actually don't run locally but ...
1
vote
1answer
157 views

address and pointer of a char and int

I have been messing around pointers and addresses to understand them better, and in one compilation i got a result which i can not explain, please see below #include "stdafx.h" #include ...
2
votes
5answers
395 views

std::vector Non-Array Implementation?

I've seen some posts on the StackExchange family of sites talking about std::vector implementations. They all seem to indicate that std::vector is implemented strictly as an array (in practice), and ...
0
votes
1answer
114 views

pthread versus boost::thread - need to set the thread priority on an ubuntu box

I wrote a class that basically executes a numerical analysis code in a thread using boost::thread. Now I need to specify the thread priority, since we are running a system with near real-time ...
20
votes
9answers
5k views

Why there is no power operator in Java / C++?

While there is such operator - ** in Python, I was wondering why Java and C++ don't have one too. It is easy to make one for classes you define in C++ with operator overloading (and I believe such ...
0
votes
2answers
92 views

Usage of objects in multiple containers in C++

In cases where there is a desire for objects to be "shared" between multiple containers, I would like to know what is the best practice in C++. For example, when implementing some path algorithms ...
-4
votes
2answers
77 views

Accessing member of vector< pair<pair<int,int>, int> > [closed]

I have made a pair of co-ordinates and pair it with an index in another pair. How can I access members of these vector pairs...?? Is there any better option to implement it..??
0
votes
0answers
30 views

Mocking delegate constructors

I am new to Unit Testing in C++. I am supposed to write a Unit test for my code and I am using Google Mock for the same. I have gone through their turtle example. But I am still confused as to how to ...
60
votes
15answers
13k views

Why would it ever be possible for Java to be faster than C++?

Sometimes Java outperforms C++ in benchmarks. Of course, sometimes C++ outperforms. See the following links: http://keithlea.com/javabench/ ...
-1
votes
0answers
104 views

Templates in c++ [migrated]

template<class T> template<typename T> T max(T a, T b) T max(T a, T b) { { if(a>b) ...
1
vote
1answer
514 views

Help me construct a list of best approaches for new C and C++ developers [closed]

Not specific code writing practices. Please also include reasoning. My start: use GCC or Clang gcc because it is unchallenged in the amount of static checking it can do (both against standards ...
2
votes
1answer
122 views

C Module - Where to put prototypes and definitions that do not belong to the public interface?

Since I am mainly an Electrical Engineer, forgive me if I am somewhat off with some terminology. I am currently programming a display driver/interface module. And like so many times before, I have ...
5
votes
6answers
5k views

What should I know about C++? [closed]

I've recently started learning C++, and I enjoy it a lot. I've often read it's easier to write bad code in C++ than in most languages, and that it is a lot deeper than what it seems. As I'd like to ...
4
votes
5answers
3k views

Template Functions and Function templates in C++

I came across a question which asked the difference between Function Templates and Template Functions in C++ and also Template Classes and Class Templates. I was under the impression that Function ...
0
votes
1answer
187 views

Are ANSI* Escape Sequences Proper For Coloring Text in Terminal(Linux)?

I just switched back to Linux after a few years of Windows use and am wondering if ANSI Escape Sequences are okay for coloring text. I ask because the way I did it on windows isn't capable of crossing ...
9
votes
4answers
501 views

Is Non-Deterministic Resource-Management a Leaky Abstraction?

From what I can see, there are two pervasive forms of resource-management: deterministic destruction and explicit. Examples of the former would be C++ destructors and smart pointers or Perl's DESTROY ...
1
vote
3answers
2k views

Is there still any value in learning assembly languages today? [closed]

Specifically for a game programmer. If you really needed some assembly routines you could look for help, whereas back in the 80s/90s it was one of the mainstream languages. I read that compilers can ...
60
votes
11answers
8k views

Why is base-for-all-objects discouraged in C++

Stroustrup says "Don’t immediately invent a unique base for all of your classes (an Object class). Typically, you can do better without it for many/most classes." (The C++ Programming Language Fourth ...
7
votes
4answers
1k views

Avoid having an initialization method

I have this existing code where they have a class and an initialization method in that class. It is expected that once the object of the class is created, they need to call initialize on it. Reason ...
1
vote
1answer
152 views

Best solution to switch between new and deprecated code

We have a feature that is currently implemented, let's call it implA. ImplA works but can't do many things. So we have decided to rewrite it. But we can't just replace it right away, so we will need ...
1
vote
1answer
85 views

Are There Tools for Statically Evaluating C++ Functions for Side Effects? [closed]

I'm interested in having a tool that can evaluate whether a function in C++ has side effects. I'd like to be able to mark functions as having or not having side effects, which I think would make ...
0
votes
0answers
101 views

Member vs free function [duplicate]

I've read similiar topics and also the following great article: http://www.gotw.ca/publications/mill02.htm I'm still not quite sure how to apply it though. Basically I have a class that is an ...
1
vote
4answers
142 views

const reference and const pointer. How do they work?

I read a post about how const storage works. How does const storage work? (Item 2, Scott Myers Effective C++) This says that each segment has separate section of write protected memory and const ...
1
vote
2answers
120 views

How can I have objects interacting and communicating with each other without forcing a hierarchy?

I hope these ramblings will make my question clear — I'd totally understand if they wont, though, so let me know if that's the case, and I'll try making myself clearer. Meet BoxPong, a very ...
17
votes
5answers
3k views

Why do all <algorithm> functions take only ranges, not containers?

There are many useful functions in <algorithm>, but all of them operate on "sequences" - pairs of iterators. E.g., if I have a container and like to run std::accumulate on it, I need to write: ...
14
votes
7answers
769 views

When NOT to use virtual destructors?

I believed I searched many times about virtual destructors, most mention the purpose of virtual destructors, and why you need virtual destructors. Also I think in most cases destructors need to be ...
6
votes
5answers
3k views

Alternate string formatting options in C++?

I'm looking at optimizing some string formatting code that's hit a lot in our code. We had been using ostringstream, and I converted the code to use sprintf (actually Microsoft's more secure ...
2
votes
2answers
118 views

Blocking function call with asynchronous content

I am sure that this is a common design pattern, but I seem to have a blind-spot. I have a requirement that the function call from Application to Service be blocking, but service needs to do ...
5
votes
2answers
501 views

Is it possible to refactor inheritance to composition when virtual methods are called inside the base class?

Let's say I have a class called Country and two subclasses called AI and Player. The Country class has a number of virtual methods to allow player-specific or AI-specific behavior. I want to make it ...
26
votes
1answer
2k views

Why does C++ not have a “pure” keyword for virtual functions?

I have always wondered why we code virtual void MyFunction() = 0; and not pure virtual void MyFunction(); Is there a reference for the basis of this decision?
16
votes
2answers
3k views

What's RAII? Examples?

Always when the term RAII is used, people are actually talking about deconstruction instead of initialisation. I think I have a basic understanding what it might mean but I'm not quite sure. Also: is ...
22
votes
3answers
3k views

C++ strongly typed typedef

I've been trying to think of a way of declaring strongly typed typedefs, to catch a certain class of bugs in the compilation stage. It's often the case that I'll typedef an int into several types of ...
0
votes
4answers
20k views

2 Dimensional Arrays in C++

I started learning arrays in C++ and came over a little side note in the book talking about 2D arrays in breif. I tested it out and i was amazed that it could give the programmer the ability to store ...
3
votes
3answers
209 views

Is this a good method to create class hierarchies?

Is it a good design to store the type of the object in the base class as an enum? For example, consider the following hierarchy Expr --Unary --Binary --Const ----Int ----Float How to represent the ...
2
votes
2answers
187 views

Is there any advantage to c-style bit manipulation over std::bitset?

I work almost exclusively in c++11/14, and usually cringe when I see code like this: std::int64_t mArray; mArray |= someMask << 1; This is just an example; I'm talking about bit-wise ...
0
votes
3answers
247 views

What arguments are there to use a coding style for each distinct language? [duplicate]

I recently had a discussion about our coding style for C# projects. Two things in particular were very hard to agree upon. Method Naming C# has the de-facto standard of naming (at least public, ...