Questions tagged [c++]
C++ is a statically typed, free-form, multi-paradigm, compiled, general-purpose programming language. This tag should be used for any question which requires knowledge or expertise with the C++ programming language. This is a general tag which is used for any of the C++ language standards (C++98, C++11, C++17, etc.). The question should identify the compiler being used, the operating system, and which of the C++ standards is being targeted.
620
questions with no upvoted or accepted answers
17
votes
0
answers
1k
views
Autotools detect C++ language standard support
I have been updating my build tools to optionally use autotools (autoconfig/automake/libtool etc.).
As part of this change I have written a couple of M4 macros. This not being something I have done ...
- 93.9k
9
votes
0
answers
526
views
Hunt the Wumpus GUI (FLTK)
I used the code from the text based hunt the wumpus game discussed here: Text based game “Hunt the Wumpus” Version 3 to create a gui Version based on excercises from PPP by Stroustrup.
For the GUI i ...
- 3,046
8
votes
0
answers
833
views
A simple Qt + MQTT doorbell application
So I built a house recently and didn't want to rely on "privacy-questionnable" systems like Google Home or Amazon whatever so I decided to build a doorbell system myself.
Hardware
I use a ...
- 181
8
votes
0
answers
302
views
Implementing GSL synchronized_value
Core Guidelines mention a type synchronized_value<T>, which supposedly pairs std::mutex with the internal value. I couldn'...
- 459
8
votes
0
answers
2k
views
Small Virtual Machine executing its own byte-code
I want present to you my little Virtual Machine. It nothing really sophisticated. It is an stack only virtual machine with the exception for some 'global' variables which i would count as registers ...
- 553
8
votes
0
answers
544
views
Simple, intuitive and (hopefully) safe EventDispatcher
For my own game engine I need an event system. I tried to avoid the single-huge-enum-approach for minimizing compile times.
The BasicEventListener is the (...
- 231
8
votes
0
answers
341
views
C++ constexpr trampoline
For fun, I implemented a trampoline function for C++ constexpr functions, since the recursion limit for constexpr functions is ...
- 3,275
8
votes
0
answers
349
views
STTCL FSM framework based on the GoF State Pattern, Part I: The basic interfaces
Preface
I have decided to let my pet project created some years ago to undergo a code review here.
The review will be broken into parts according to meta question Multiple reviews or one big review?...
- 5,102
8
votes
0
answers
331
views
.NET DLL Injector in C++
I built a DLL Injector with User-Interface.
The program lists all processes, the user chooses one of them and a DLL, and inject it.
It's my first project in C++, and I know it's not exactly C++ ...
- 81
8
votes
0
answers
7k
views
I am using boost::process to call an external process, and using stdout, stderr, and stdin to supply/retrieve data
I have some program which takes input via stdin, writes output to stdout, and errors to stderr. I would like to call that program from another program, supplying data via stdin, and capturing output/...
- 81
8
votes
0
answers
3k
views
constexpr Sin Function C++ 14
I have written a constexpr sin function using c++14 and would like to know what I can do to improve it. I am trying to balance code clarity/maintainability with ...
- 407
7
votes
0
answers
407
views
c++ std::function implementation
When I first tried to implement std::function I thought it would as easy as creating a class that holds a function pointer. Consequently, I quickly figured out that ...
- 659
7
votes
0
answers
206
views
Find an arithmetic expression near to target value
I wrote this program as an answer to Express a Number challenge on the Programming Puzzles & Code Golf site; it may be worth looking there for the context. The concept is simple (and familiar to ...
- 71k
6
votes
0
answers
222
views
Create 'classical' visitor from lambdas
I've watched a talk by Fedor Pikus on design patterns held at CppCon 2019. Motivated by this, I wrote my own visitor implementation and some helpers which allow me to create a visitor from a couple of ...
- 203
6
votes
0
answers
952
views
Make Flutter app on Windows a drop target to accept files
My aim was to provide functionality for a Flutter app on Windows to accept drag-and-dropped files.
Flutter apps are written in Dart and compiled to native code, but since this is a cross-platform ...
- 61
6
votes
0
answers
477
views
C++17 ECS Implementation
I am (relatively) new to game programming and have been exploring creating an entity component system for my simple 2D game engine.
Here is what I have so far:
Entity.h
...
- 93
6
votes
0
answers
238
views
Buddhabrot made in CUDA
In the past I have made programs that have generate a buddhabrot with mostly success however all of them were on the CPU and single threaded. As a result they were all slow so I wanted to remake the ...
- 659
6
votes
0
answers
145
views
Game event loop for multi-threaded application
My take on this problem for a hobby project.
I have an event loop that advances game state and processes user input.
Rendering is no concern of this event loop, and is intended to run on a separate ...
- 173
6
votes
0
answers
211
views
Resource cache based on Stroustrup 22.2.4
I recently read "The C++ programming language" chapter 22 and I thought the example given in chapter 22.2.4 was quite interesting. I thought it should be possible to make this system caching, so it ...
- 61
6
votes
0
answers
181
views
C++ string Formatter Again Part-4
Previously asked here.
The code is now available on GitHub.
Since the previous review I have added unit tests.
Since it is big it will come in a couple of parts.
Part 1 | Part 2 | Part 3 | Part 4
...
- 93.9k
6
votes
0
answers
113
views
Read stock files, gets the candles sequence and makes a report - follow-up
My first question: Read, calculate, write
The only thing I kept is the function try-block.
This is still a work in progress, that's what I have done so far.
Source:
...
- 307
6
votes
0
answers
221
views
Value semantic type eraser
I've been using std::unique_ptr for cases where I want to store a derived-type value with type erasure, and felt that unique_ptr being nullable was an undesirable ...
- 451
6
votes
0
answers
502
views
Console Command module (in-game console or base for script engine)
I've created a console/terminal command handling module that allows the programmer to bind functions to a command name and later execute them from std::string. What's new is that it handles most stuff ...
- 161
6
votes
0
answers
181
views
Easy bitset IO v2
In a previous question I posted a method for easy std::bitset IO on a bit-for-bit basis. This question was later followed up in another solution. Both of these ...
- 825
5
votes
0
answers
1k
views
Qt - Creating a dark overlay to apply on top of other widgets with animation
I want to be able to create a dark overlay on top of other widgets that can be turned on or off with animation. I managed to get this to work.
But I think I'm doing it in a wrong and inefficient way; ...
- 51
5
votes
0
answers
260
views
Optimizing bit-matching performance using AVX compiler intrinsic
We are working on a complicated math problem, very detailed question with description of the problem is here: C++ multi-threaded determination of curling numbers in vectors.
That code is now converted ...
- 151
5
votes
0
answers
70
views
Small Automatic Differentiation Library
Introduction
As a programming exercise I recently wrote this automatic differentiation library based on forward accumulation. It should offer a simple way to create mathematical functions whose ...
- 51
5
votes
0
answers
150
views
Using an extra mock simply to take advantage of the behaviour observation tooling
I'm writing integration for a project, but our framework doesn't provide any ability to inject dependencies, so I've written tests with a unit testing framework (GTest) and used a mock (GMock) in an ...
- 151
5
votes
0
answers
968
views
Polymorphic deleter for unique_ptr
There is a basic difference in the way C++ manages the deleter for std::unique_ptr and std::shared_ptr, mainly for allowing ...
- 225
5
votes
0
answers
101
views
4×4 cofactor in SSE
The cofactor of a 4×4 matrix can be used to convert a "regular geometry" matrix into the matrix that transforms the normals. It's an alternative to the common inverse-transpose pattern. In this post I ...
- 8,724
5
votes
0
answers
83
views
Interfaces and OOP Design for Image Editor software
I'm new to C++ programming, and I'm building an Image Editor software like Lightroom/CameraRaw from scratch.
Apart from procedural code (actually seems that all the functions works correctly) my goal ...
5
votes
0
answers
44
views
JSON Test Harness: Part 2
Part 1: JSON Test Harness: Part 1
Part 3: JSON Test Harness: Part 3
Part 4: JSON Test Harness: Part 4
Time to review some test harness code I have written.
https://github.com/Loki-Astari/...
- 93.9k
5
votes
0
answers
72
views
JSON Test Harness: Part 1
Part 2: JSON Test Harness: Part 2
Part 3: JSON Test Harness: Part 3
Part 4: JSON Test Harness: Part 4
Time to review some test harness code I have written.
https://github.com/Loki-Astari/...
- 93.9k
5
votes
0
answers
2k
views
C++ game engine event system implementation
I am currently working on the implementation of Event System on a game engine. I have zero experience in Event System implementation or the patterns that are used. What I have done is what I've seen ...
5
votes
0
answers
1k
views
Bubble sort in parallel
I have done bubble sort algorithm on a vector that is filled with randomly generated values. Bubble sort is actually done with odd-even transition method:
...
- 275
5
votes
0
answers
979
views
Quasi-Random Number Generators
I would like to communicate a piece of code which I hope will soon be broadly useful for everyone who programs in C++: A set of quasi-random number generators proposed for addition to boost.random. To ...
- 713
5
votes
0
answers
150
views
Delegated condition_variable against spurious wakeup
This is my attempt at dealing with spurious wakeups: A new class which replaced std::condition_variable in my code.
Some questions which came to my mind are (and I ...
- 193
5
votes
0
answers
2k
views
3D FPS Camera in OpenGL
So I've got a basic FPS camera working which can move around the 3D space. Having trouble with physics but thats not why I'm here!
So the code below creates a scenegraph which contains torus model ...
- 151
5
votes
0
answers
160
views
Using SFINAE with wrappers to terminate compilation early
The Goal
Provide some wrappers to a C++11 template library's main entry point so that if the initial template parameter is not valid, the user is informed of exactly what is missing.
In the real ...
- 205
5
votes
0
answers
223
views
deep_ptr<T>; a header-only, deep copying, value semantic smart pointer for optionally defined types
Edit: final revision here
A couple days ago I posted a similar question here. Since then, I have refined the implementation a bit further, as the solution I had previously posited was a bit off ...
- 405
5
votes
0
answers
2k
views
Generic sliding window
The code implements fully generic sliding window with linear complexity. It should usually be paired with transforming iterator to reach full potential.
Sliding window is a grouping of elements by ...
- 9,374
5
votes
0
answers
487
views
Intrusive weak pointer
WeakPtr can point to any object provided it inherits from WeakBase. So, for example, you could use it to observe an object ...
- 287
5
votes
0
answers
708
views
Calculating complex exponential numbers using OpenMP in Cython
I am trying to create a function that can either beat numexpr or perform comparably for the vectorized mathematical operation ...
- 151
5
votes
0
answers
692
views
A full-duplex connection to an IRC server
This connection class can be used, through composition, to make IRC clients for different kinds of IRC services.
...
5
votes
0
answers
1k
views
Graph as adjacency lists: BFS DFS Topological Sort
I have written some code to practise graphs. Graph is represented as vector<list<int>> . Would you share some feedback with me?
Are algorithms correct ...
- 151
5
votes
0
answers
66
views
Using the llvm::iterator_adaptor_base
I'm currently working with the LLVM JIT framework. There is some graph I had to implement for internal cost bench-marking. It has cyclic node dependencies, so I have to use ...
- 387
5
votes
0
answers
202
views
Fake 3D effect in SFML - follow up 2
Based on my previous question, I have implemented all the recommendations received. In addition, i have implemented new features and completed road geometries.
Here is a summary of the improvements:
...
- 3,278
5
votes
0
answers
2k
views
Disruptor pattern in a lock-free producer-consumer queue
I'm implementing a quick-and-dirty lock-free MPMC queue in C++, based on the v3 Disruptor algorithm. The implementation is pretty simple:
Data to be shared between threads is stored in a ring buffer.
...
- 310
5
votes
0
answers
210
views
Text-based Snake game on Window - follow-up
Previous question:
Text-based Snake game on Window
Summary of improvements:
Removed unnecessary functions such as clearScreen()
Added new ...
- 3,278
5
votes
0
answers
1k
views
C++ class "overload" using variadic templates and wrapped function pointers
I'm using C++11 and I have the following problem (pseudo C++):
...
- 51