Questions tagged [c++]
Questions about C++, a statically typed, free-form, multi-paradigm, compiled, general-purpose programming language.
2,351
questions
1
vote
1answer
207 views
Remove duplicated switch statements caused by not knowing type at compile time of opencv matrix?
I have a situation that occurs 5 times in my code, and continues to grow. Basically I have the same switch statement structure every time I need to perform an operation that involves my matrix and ...
2
votes
3answers
426 views
How do I put objects of different types derived from a common base in the same array? [closed]
I have two classes called Player and Enemy both inheriting from a class called GameObject, how do I store them both in an array of type GameObject while still keeping their own unique information?
I ...
3
votes
1answer
510 views
3D Rendering Engine architecture for multipass rendering
I'm implementing a simple 3D rendering engine for my game, I'm using DirectX11. I created a simple architecture for the rendering engine, with a central rendering system (RenderingSystem class, a ...
1
vote
6answers
352 views
Is it okay to have a parent class that doesn't represent an entity and doesn't have an “Is-A” relationship with its child classes?
I want to have an array that can hold elements of many classes data types, and each of these classes have a method called printInfo().
The way I can do that is by having a parent class called ...
-1
votes
1answer
62 views
Best OOP practices for object accessing “aggregate object” members?
Is there a best practice for something like this?
(Example in C++)
class A {
public:
int usefulParameter;
std::vector<B*> bContainer;
};
class B {
public:
void ...
1
vote
2answers
2k views
Calling a static method from constructor's member initializer list
I'm implementing a simple rendering system for a game engine. In my engine I have renderable entities that have a Model component (I'm using inheritance as opposed to a ECS for my engine for now, but ...
5
votes
5answers
283 views
Designing for 3rd Party Extensibility
I'm having trouble understanding how to provide an API to 3rd parties in order to allow extensions for desktop applications. I understand that if I'm using a compiled language (e.g. C++), I can load ...
9
votes
4answers
718 views
C++ Preferred method of dealing with implementation for large templates
Typically when declaring a C++ class, it is best practice to put only the declaration in the header file and put the implementation in a source file. However, it seems that this design model does not ...
0
votes
1answer
79 views
Abstract data communication in modular design
I'm doing the analysis for a software which I've had in mind for a long time. Its purpose is to turn sound into an image, apply graphical transformations on it, and turn it back into sound to hear the ...
27
votes
2answers
4k views
Implementation of pure abstract classes and interfaces
Although this isn't mandatory in the C++ standard, it seems the way GCC for example, implements parent classes, including pure abstract ones, is by including a pointer to the v-table for that abstract ...
0
votes
1answer
124 views
Can source code, automake and configure files for multiple OS co-exist in one Git branch
I am working on an open source project that should be compiled for multiple operating systems including Ubuntu and Windows.
I am working on how to structure the Git repositories and branches for ...
1
vote
0answers
33 views
Applying an overloaded/templated function depending on the type of a QVariant
I'm trying to take a QVariant (in this case from a QProperty generated on a class) and based on the type, return a QWidget that allows for it to be edited appropriately.
a signature for the ...
1
vote
2answers
239 views
Using C coding conventions in C++ code [duplicate]
I'm working on a large codebase whose core modules are in C and extension modules are in C++. We have a coding convention for C code but I'm being told that we need to enforce the same coding ...
-1
votes
1answer
652 views
Combining the arguments of a function using a single structure
What are the consequences (pros and cons) of using a single structure as the argument, instead of a list of parameters. Some of the advantages I see are:
create multiple default parameters.
Need not ...
3
votes
2answers
2k views
How to deal with exceptions in DLLs?
I recently started working on an existing project written in C++ Builder.
The application consists of a MainModule that loads lots of modules (DLLs). The MainModule itself is a DLL (there is a small ...
3
votes
0answers
78 views
Creating bindable input handler in C++ spanning two separate modules
I have a wxWidgets application. This is the first, main module. The second module is an openGL engine. It's a model-view-(controller) structure, where application is the view (and the controller), ...
4
votes
2answers
942 views
How is usually named a non-const getter?
Quite often you need to define a getter returning a reference to a member, and a corresponding setter.
They usually look somewhat like this :
class Foo
{
Type member;
public:
const Type& ...
2
votes
1answer
287 views
Designing a pause'able & resume'able task handler
I don't think the title describes the situation exactly. I apologize for the poor description.
I'm trying to write a software system, in C++, that will have a heavy job (scanning the file system for ...
2
votes
2answers
573 views
Is this Aggregation or Composition?
As far as my understanding for composition, the children cannot exist without the parent. But my instructor is suggesting that the following example is an aggregation, I just want another opinion.
...
1
vote
4answers
499 views
Code Coverage and Defensive Programming (in private functions)
Assuming you want to build automated tests for the following (very simple, if odd) class.
// Calculates the distance between neighboring values in a vector
// and provides functions to return the ...
1
vote
5answers
775 views
Designing a card game
I want to expand my personal projects portfolio, so I decided to make a card game. To be more precise, it's called Macau. I've read this answer on StackOverflow and tried to follow the steps from the ...
4
votes
2answers
823 views
Implementing reference counting from scratch or using shared_ptr for resource?
In an OpenGL application that I am writing, I want to have a simple shader class to wrap the OpenGL shader handle. Ultimately, I want this shader class to behave very similarly to a shared_ptr in c++ (...
3
votes
3answers
2k views
Proper way to send custom data structures by sockets
I'm wondering what is the proper way to send structures as char array by sockets.
At this moment I have somethig like below but it isn't good solution because it causes undefined behavoiur. Is it ...
6
votes
4answers
2k views
Is this using macros to define classes that fit a pattern in C++ a sound idea?
I've got a set of classes that all inherit from a base class that are responsible for different functions (sort of like a group of "operators") They all work on the same input and output the same ...
2
votes
4answers
884 views
Is “Let more people able to review” a valid reason to “write c++ as if Java” at some degree?
According to Should we avoid language features that C++ has but Java doesn't?, I know it is horrible to write C++ as if Java, mostly because it drops the beneficial features of C++ languages.
But ...
17
votes
5answers
13k views
Is passing arguments as const references premature optimization?
"Premature optimization is the root of all evil"
I think this we can all agree upon. And I try very hard to avoid doing that.
But recently I have been wondering about the practice of passing ...
0
votes
1answer
1k views
Using a macro for a libraries namespace?
In some code bases (such as hydra, and thrust's tuple implementation) I see namespaces defined entirely with macros. It appears the reason for this is so that you can configure the namespace to your ...
1
vote
1answer
229 views
Is it wrong to prefer exceptions to centralize error handling logic?
Using C++, often I hear that you should avoid throwing exceptions for flow control and you should avoid calling functions in conditions where you know they will throw. For example, if a function ...
-2
votes
3answers
439 views
Platform independant ways of passing messages between executibles
I am working on an a data collector which could be called an API of some sorts, which is based on .Net Core 2.1 .
It's job is to receive and pull (ask for) data from data collectors(executable, DLL,...
2
votes
3answers
1k views
High level overview of how printf() works with Windows OS
I asked this question on an IRC channel, sadly I am going around in circles.
I am aiming for a high level overview (but with some technical details if necessary) on how a function such as printf() ...
2
votes
2answers
205 views
Designing a Way for Process to Communicate with Kernel
I've got a project that is sort of a virtual operating system.
In this project, the Kernel class is responsible for creating Process classes. The process class consists of Thread classes and the ...
1
vote
1answer
190 views
Limitations of using classes as interface
I am an Electrical Engineer now training and working as an embedded software developer, so I have little formal computer science and software design training. I have until a few months ago only worked ...
0
votes
1answer
412 views
Advantage or disadvantage of using = operator or uniform initializer while using auto keyword
Most examples of auto use the = operator.
#include <iostream>
int main()
{
auto a = 1;
std::cout << a << '\n';
}
Why don't they use the uniform initializer like this?
#...
24
votes
7answers
11k views
Should the STL be avoided in large applications?
This might sound as a weird question, but in my department we are having trouble with following situation:
We are working here on a server application, which is growing larger and larger, even at the ...
3
votes
1answer
504 views
How to deal with large source codes?
Maybe this answer already exists here, but I do not know if there is any technical term for that.
I'm starting to develop in C ++ and as the program grows in size, it gets harder to move through the ...
7
votes
3answers
776 views
Where should I put my enum classes?
I have some code that looks like this:
// Player.hpp
class Player
{
public: enum class State { RUN, WALK, STAND };
};
The enum class State is used by the Player class, as well as by many other ...
3
votes
3answers
273 views
How to separate serialization, visualization and computation from GUI editable code objects?
This might be an X Y problem, but here's my situation.
I've got a QT5 C++ code base whose task it is to allow for the configuration of a "process chain". A "process chain" here means a list of ...
0
votes
1answer
912 views
Does it make sense to iterate a ranged for loop using constant reference here?
I have the following code, and I was wondering if I'm optimally iterating through my ranged for loop:
struct data_type
{
int a;
int b;
};
int main()
{
// Assume I have initialized a ...
-4
votes
1answer
459 views
TIOBE Index: why c++ is in 3rd place and C is having more land in the last year?
Searching for c++ ranking on the TIOBE index, I was stumped to see that C is in front of C++, and from 2017, C took a leap. Could someone explain why?
8
votes
7answers
4k views
Best practice to “continue” from inside a nested loop?
Here is a simplified sample. Basically, it does checks on a string from a string list. If the check passes, it will remove that string (filterStringOut(i);), and it is no longer ...
2
votes
2answers
262 views
(Style) “Good” way of dealing with flags/options
So I've seen many different methods used for this in different librarys, and I want to get a sense of which one may be preferred (or perhaps it's strictly personal preference/case by case). Just as an ...
1
vote
2answers
205 views
Large matrix manipulation in multithreaded environment
I have:
matrix 20*40000 of floats M - std::vector<std::vector<float>>;
1000 values X;
~2000000 POD structures S.
A typical situation is: for each value from X I take several structs from ...
1
vote
1answer
2k views
Difference between header files and interfaces
I wanted to know whether the header files in c and c++ have same function as that of interfaces used in Java? If not what is the difference between header file and interface?
3
votes
1answer
3k views
How to improve a pattern 'enum class with methods'
Over many years, I always find myself reconsidering this design, so I wanted to get some feedback on my solution to it.
Problem:
I need a limited amount of objects = instances from a class, and I ...
5
votes
3answers
4k views
Moving from Qt/C++ to C#/WPF - Productivity Gain?
I created a small Desktop application (approx 15000 lines of code, so not that large) written in C++/Qt. This is non-commerical, just a hobby project and I am coding on my free time.
The larger the ...
-2
votes
2answers
132 views
How to call more than one program from a single process in an efficient way?
i want to call more than one process from the main program which is written in C++.
how to call them with the most efficient way given that one process may open and close more than one time.
the ...
1
vote
2answers
226 views
Picking a concrete type based on a configuration parameter
I have a code base that contains several different instances of the following pattern, the key point of which is that the concrete type of the class is decided at run time based on a string from a ...
1
vote
2answers
212 views
Does increase of number of classes have impact for performance
I'm in the middle of refactoring a project (in C++11) and I'm struggling with a decision is it good to change huge enum with about 100 record to separate classes.
This enum is used in about 4 places ...
8
votes
3answers
3k views
What is the correct approach to test classes with inheritance?
Assuming I have the following (over-simplified) class structure:
class Base
{
public:
Base(int valueForFoo) : foo(valueForFoo) { };
virtual ~Base() = 0;
int doThings() { return foo; };
...
7
votes
2answers
481 views
FIFO Min-Max-Heap for Rolling Median
I'm working on a system with hard real-time constraints in c++ and I need a very fast way to calculate the rolling/moving/streaming median of a set of numbers of size N=100 to 300. Normally this size ...
