Tagged Questions

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

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2
votes
1answer
188 views

What are the main differences between C++ templates and Java generics? [closed]

I'm a beginning C++ programmer coming from Java. It feels to me that C++ templates and Java generics are actually pretty similar. You use them in pretty much the same occasions and in the same way. ...
0
votes
1answer
178 views

Does C++ abuse the stack? [closed]

Somewhere on the internet, I remember reading someone complain about how C++ puts so much more stress on the stack than C. They didn't go any further to explain what they said, but I understand that's ...
1
vote
1answer
61 views

saving connectivity information in a nodes/edges network

I want to implement the A* algorithm. I have a network with Nodes and Edges, both are classes. Now, I am unsure how to approach the connectivity information. Should a node know which edges depart ...
4
votes
1answer
263 views

Move semantics in C++ - Move-return of local variables

My understanding is that in C++11, when you return a local variable from a function by value, the compiler is allowed to treat that variable as an r-value reference and 'move' it out of the function ...
2
votes
3answers
330 views

What should I do in C++ when implementing a container class: storing objects by value or by reference?

I'm new to C++, coming from Java. In Java, all variables (except for primitives) are essentially pointers. They hold the address of whatever they're 'holding'. So any Java data structure stores it's ...
4
votes
1answer
93 views

Handling interface segregation in C++

I'm designing a "view" handling system for a game. The goal is to be able to have different "views" that can be shown in sequence or stacked on-top of each other. For example, the initial splash ...
2
votes
4answers
309 views

Is this a commonly encountered situation in C++? Is there a pattern to handle it?

I am writing a game in C++, and something I have noticed is that I have many resource files which need to be loaded after a particular point in initialization. For example, OpenGL textures and VAOs ...
0
votes
2answers
95 views

What do you call the line/s of code that declare that a class or function is a template? [closed]

I'm writing some macros which declare template types and I'm a bit stumped for terminology. To illustrate, take the following example: // template class declaration template <typename A, typename ...
-1
votes
2answers
344 views

FizzBuzz on Large Scale

So I was asked to create FizzBuzz at an interview... Easy enough but then they say what if there is a million data points. ie. divisible by 3 divisble by 5 divisble by 6 up until a billion. What is ...
-2
votes
2answers
74 views

Debug symbols change application execution [closed]

I have to set up remote debugging for a multi threaded application running on a embedded device. C++ is the language. I've gotten so far and got the remote debugging working for a simple application, ...
1
vote
1answer
166 views

What kind of game mechanics makes sense to be handled on client side? [closed]

I am aware of that is a difficult question and depends on the game mechanics and game type being applied. So, many answers can be given. For the sake of simplicity, it would be better to consider a ...
3
votes
6answers
436 views

Unit test private method in c++ using a friend class

I know that this is a debated practice, but let's suppose that this is the best option for me. I am wondering about what is the actual technique to do this. The approach that I see is this: 1) Make a ...
0
votes
3answers
311 views

C++ Chess board design and smart pointers [closed]

I wrote a Chess engine in Java and I am porting it over to C++. I am new to C++. The idea: I have a Board object which holds a 2-dimensionnal array of Piece objects. Queen, Rook, Bishop, etc are ...
6
votes
4answers
530 views

Does internal state “leak” when it influences externally-visible behavior?

I have a method (in C++) which generates a value based on a parameter and the parameters from previous calls. Calling it more than once with the same parameter may generate different values each time. ...
3
votes
2answers
191 views

Decision making and maintenance

I'm trying to find an elegant way to implement a decision making algorithm that allow easy maintenance because the conditions for the decision making might change often. I'm going to try and be more ...
1
vote
2answers
211 views

Organise C++ classes around SQL database

My question is about how best to organize C++ classes around a database model, and I understand this may appear very elementary. The software I propose to create will do the following. It is intended ...
1
vote
3answers
354 views

C++: Metaprogramming with a compiler API rather than with C++ features

This started out as a SO question but I realized that it is quite unconventional and based on the actual description on the websites, it might be better suited to programmers.se since the question has ...
0
votes
3answers
336 views

Good 'real life' example of operator overloading C++ [closed]

What are examples of classes to use operator overloading on in C++? All the examples and tutorials I can find on the net use non-sensical classes/objects (foo/bar, one or two integers..) What are the ...
0
votes
2answers
133 views

How to organise and label methods, intended for debug?

I have a class System, which uses a bunch of other classes, to achieve a complex signal processing. In debugging System, one needs to observe the output signal for patterns. This is not achievable by ...
1
vote
4answers
406 views

How to work around Java's lack of pointers to pointers when working with linked data structures? [closed]

I've learned from a textbook how to implement binary search trees recursively in Java, and am working on implementing them nonrecursively. I've found a simple and elegant way to implement an insert ...
2
votes
1answer
171 views

How do multiple levels of inheritance affect virtual function call overhead in C++?

I am considering using a class hierarchy with more than a single level of inheritance, where virtual member functions form a "chain", for example: struct Base { virtual void foo(); }; struct D1 : ...
3
votes
4answers
196 views

Storing a pointer to an argument passed by (non-const) reference

When designing an interface for passing objects which are meant to be stored for later use and which should not be 'null', I am always a bit uncertain if the argument should be passed by reference or ...
0
votes
2answers
131 views

Can I create a type, typedef or using statement that results in a different type if instantiated a second time or more?

Suppose I have a class that evaluates some computationally intensive function: class Value { private: int eval() { mCached = ExpensiveOperation(); return mCached; } static int ...
0
votes
0answers
45 views

API for accessing CTS and DSR signals of serial port

I'm trying to improve another abstraction of the serial port. The project involved often needs to check one of the single control signals CTS and DSR. This is currently done by a call to ...
-1
votes
1answer
122 views

What are guidelines for a Win/Mac/Linux C++ source tree? [closed]

I'm learning C++ (C++11), specifically for cross platform game development using SDL. on Windows, I use Visual Studio 2012 (Considering buying '14' once it's out), on Mac OS X and iOS I'll be using ...
3
votes
2answers
261 views

Does ODBC require any run-time software beyond an .exe file to run against MySQL and ORACLE SQL? [closed]

I'm writing a software [under Windows] in C++ which later needs to be able to connect to both MySQL and ORACLE SQL. Now the software needs to be as simple for the user as possible. Now I'm ...
1
vote
4answers
495 views

c++ coding practice class vs. “free” functions

I am currently writing my first bigger project in c++. Its basic linear algebra. I am aware that boost libraries and others exist, but for various reasons I need to write my own. Purpose of the ...
0
votes
0answers
43 views

c++ coding practice class vs. “free” functions [duplicate]

I am currently writing my first bigger project in c++. Its basic linear algebra. I am aware that boost libraries and others exist, but for various reasons I need to write my own. Purpose of the ...
7
votes
5answers
585 views

Undefined behavior, in principle

Whether in C or C++, I think that this illegal program, whose behavior according to the C or C++ standard is undefined, is interesting: #include <stdio.h> int foo() { int a; const int ...
1
vote
1answer
92 views

Standardization and official guidelines for C++ template parameter naming [closed]

What are some explicit and official guidelines or standards for template parameter naming in C++? I've done something like this in the past: template<typename TContainer, typename TKey> void ...
1
vote
3answers
174 views

Is it bad practice to use Inheritance to associate methods with a basic container?

Basically, I have code that looks like this. It's a typedef and a set of methods that revolve around that typedef. class foo { // Foo stuff... // Registration Stuff private: ...
1
vote
1answer
248 views

C++ : Association, Aggregation and Composition [closed]

I'm beginning to study OOAD and I'm having difficulty finding a C++ code example that'd illustrate how Association, Aggregation and Composition are implemented programmatically. (There are several ...
4
votes
2answers
281 views

dealing with a very large state machine in a class

I am currently implementing a class for a network protocol. The protocol uses a quite complex and extensive finite state machine. A pair of an event plus a state is mapped to a function, which does ...
1
vote
3answers
194 views

How to abide the “allocate in caller” rule when the size is computed in the callee?

Let's say we have an opaque type handle_t that is managed through a simple interface with functions such as: handle_t *handle_init(void); int handle_do(handle_t *); void handle_free(handle_t *); ...
1
vote
1answer
215 views

Polymorphic engines in C and/or C++ [closed]

I stumbled across polymorphic engines and I don't know anything about them. However, I am curious about how they are written. Every example that I've looked up writes them in assembly, my assembly is ...
-3
votes
2answers
125 views

Why friend in C++ should be in the header file? [closed]

Friend function/class, FriendOfX for some arbitrary class X is an implementation detail of class X. Why in C++ we have to declare them in the header file? Are there any compelling reasons to make this ...
-7
votes
3answers
123 views

What's the list of how to precisely talk about problems in C++ code within the spec? [closed]

The C++ specification leaves a lot of leeway such that when you write bad code, compiler authors are not responsible for defining a specific mode of failure. We know of course that is Undefined ...
-3
votes
1answer
121 views

Is this a good use of a base class? [closed]

I am developing some HW drivers, which access registers. I have a few classes, for example. ClassRegisterBlock1, ClassRegisterBlock2. In each of these classes, they define the bits to manipulate, ...
2
votes
1answer
224 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 ...
1
vote
2answers
229 views

How to avoid redundant code in designing inheritance in C++

Say I have a Base class called Car and it has 3 derived classes say Ford, Honda and Audi. The issue is, all three derived classes have exactly same code but minor difference in calling member ...
-2
votes
1answer
106 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 ...
0
votes
2answers
234 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 ...
3
votes
2answers
180 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 ...
3
votes
2answers
168 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# ...
1
vote
3answers
654 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() { ...
2
votes
1answer
80 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
142 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 ...
2
votes
1answer
120 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
114 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.
0
votes
2answers
92 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 ...