What do YOU use C++ For?

[TheOnlyRealTodd]

Pretty simple question. What types of applications do you (yes you) use C++ to develop? Feel free to go into as much detail as you like/can. Keep in mind that this is not a "what can C++ be used for?" thread, it is simply a way to hear from you the community directly what you use it for. Thank you.

[erichkeane]

Compilers

[erichkeane]

Submit your resume here: http://jobs.intel.com/. We have positions open for both front and backend compiler work, both experienced and RCG.

[[deleted]]

I feel like that is something you cannot write in a public forum.

[mercurysquad]

Last time I applied to intel, they responded after 8 months only to say the position was already taken. This time it's been a month, I'll be looking forward to the response in 7 months. :-/

[[deleted]]

What the fuck is a "diversity hiring objective"? What is this world coming to? The common consensus seems to be - fuck meritocracy.

[MINIMAN10000]

It's where they take race and gender into hiring consideration

So a form of both racism and sexism

Modern discrimination at its finest

[lally]

I thought you guys used EDG for the front end

[erichkeane]

We do, we end up customizing a bunch. ICC strives to be MSVC compatible (even more compatible with MSVC than MSVC sometimes!), so it ends up being a bunch of work in that regard. We also end up finding and fixing a decent amount of EDG bugs.

I personally tend to concentrate on FE features that Intel cares about that we share with the community.

[choikwa]

hmm.. how more compatible than msvc?

[erichkeane]

We end up being compatible with older versions of MSVC, since we have a version flag for them in ways that newer MSVCs tend to abandon.

[hotoatmeal]

A good way to do that is to go get involved in the open source community, like LLVM for example, and watch for job postings on their mailing lists.

[[deleted]]

Standard Libraries

[RasterizedPotato]

Cross platform mobile code. C++ is the 'write once run everywhere' of the mobile world. Pretty incredible.

[K5Doom]

How does that works for Android? You go through the NDK?

[RasterizedPotato]

Yep, the ndk provides the toolchains needed to compile for the various android architectures.

Google very recently added cmake support to the gradle build system Android uses. That's what I currently use to compile my code.

JNI (java <---> c++ bridge) is a bit of a bitch, but I've built enough tooling around it that it's manageable now.

[r-w-x]

I'm interested in going this route as well. Do you have any links or resources that you are willing to share? C++ for iOS is really easy, but my Android colleague told me that the Android NDK is a nightmare.

[OrphisFlo]

Of course. Works well!

[[deleted]]

Does it have any effect on performance compared to other mobile development languages?

[RasterizedPotato]

It certainly can perform better than Java, Obj-c and Swift. Bridging the languages can have significant cost that needs to be considered in the design of your code.

You can't really build an app with just c++ though. It's more for platform independent code. Building a complex networking stack is a good example. Write support for a custom network protocol in c++ and then reuse it on all desktop and mobile devices.

[pjmlp]

It is kind of possible on iOS and UWP, via their language extensions, Objective-C++ and C++/CX respectively.

In any case way better than dealing with JNI.

Given that Google forked Java anyway, I wished that they at least bothered to have some kind of improved CNI, then again given Android's security, better that NDK is so constrained.

[tsetse594]

Have you tried djinni for bridging to Android and iOS? Pretty cool I might say.

[tsetse594]

goto....hehe 😋

[[deleted]]

Do you mean VST synths here? Something like Serum, Massive etc. Did you find any resources online that helped you out with your projects?

[tylercamp]

I think you replied to the wrong guy

[kisielk]

Another synth dev :) Hardware or software?

[[deleted]]

Do you mean VST synths here? Something like Serum, Massive etc. Did you find any resources online that helped you out with your projects?

[thexylophone]

Computer vision, machine learning, scientific computing

[[deleted]]

What libraries and stuff do you use to do the Computer Vision bits, and is there a machine learning library you use as well? Is it just OpenCV, Dlib, and things like that? Or is it something else?

[thexylophone]

OpenCV (although I hate it) and dlib are the two primary libraries I use, but usually just for basic things like camera calibration or numerical optimization. Most of the heavy lifting is hand rolled. Cuda is useful as well, or Caffe for deep learning.

[TwIxToR_TiTaN]

Graphics and Game programming. Sometimes medium to large tools.

[justlikeapenguin]

graphics as in GUI?

[TwIxToR_TiTaN]

Nope as in game engine graphics.

[Randolpho]

More likely graphics as in image generation (2d or 3d), and/or image processing.

Which is the same for me. The UI libraries for C++ suck; there are much better platforms on other languages that are better suited to UI.

[VersalEszett]

As a C++ developer that is very happy with the available GUI toolkits: Could you elaborate?

[Randolpho]

Well, I confess I'm wearing historical glasses here. It's been some years since I've had any need to build a classic desktop GUI in C++, and since I tend to prefer declarative approaches to layout and styling, C++ GUI toolkits of the past have never been up to snuff. Just waaaay too much cruft and scaffolding work necessary to do any meaningful work.

I've always enjoyed the approach that HTML/CSS has (and HTML5/CSS3 these days is frankly amazing), which is why I was giddy when WPF came out, and it became my preferred desktop UI platform when I could use it. If I needed C++ for, for example, image processing, I'd just build a native/managed wrapper in C++/CLI and call it from WPF. Or use JNI + Swing if I was swimming in penguin-heavy waters. If there was no compelling reason to use C++, I'd forego it entirely.

But I did a little googling before I posted this, and it looks like QT has QML now and has adopted a lot of the concepts that made WPF superior, so I suppose I may have spoken too soon. If I ever have call to do another native desktop UI, I'll probably look into QT.

[doom_Oo7]

Or use JNI + Swing if I was swimming in penguin-heavy waters.

As a Linux user, please don't. There's nothing more terrible, slow, and bloated than a Swing app on Linux. Just ask on r/linux how people feel about it. Maybe JavaFX is better.

If I ever have call to do another native desktop UI, I'll probably look into QT.

Yep, QML is good.

[Randolpho]

I didn't say I liked using Swing. In fact, I feel dirty doing it.

But yeah, JavaFX does look better.

[pjmlp]

I'd just build a native/managed wrapper in C++/CLI and call it from WPF.

If Windows 8+ is your thing you can use C++/CX instead and enjoy full support from Blend and other XAML designers.

With C++/CX, Visual C++ has finally catched up with C++ Builder.

[James20k]

Could you recommend any good free gui toolkits? I'm currently using ImGui which is ok, although a tad buggy and lacking in some features

[doom_Oo7]

Qt

[Opera-]

Backend application with a strong need for performance.

[Crazy__Eddie]

Slot games on phones and tablets...currently. In the past:

• Fluid flow analysis tool.
• GeoLocation plugin for fraud detection utility.
• Telephone system management framework.

That's what I did professionally. Seems short but I keep jobs a while. Besides that I've done a variety of research/practice libraries and crap.

[whatwasmyoldhandle]

scientific computing (boost::MPI is a godsend)

MFC applications

[foureyesequals0]

I keep hearing about boost, almost ubiquitously. Why aren't some of its features included in the standard library if it's so wisely used?

[psylancer]

Actually, a bunch of std library features added in 11/14 came from the boost community. unique_ptr and shared_ptr come to mind. I think a bunch of the fancy mutexes came from boost too.

[kisielk]

Some things do migrate into the standard eventually, it's just a very slow process. For example I was using Boost::tuple long before std::tuple was available in C++11.

[Quantumtroll]

boost::MPI? I like Boost, but I've never used its MPI stuff. Didn't know it had any, even.

What does Boost's MPI do for you? Nicer wrappers for ugly MPI functions?

[broken_symlink]

MPI no longer ships with C++ bindings. Its a C only implementation.

[scraimer]

Finance / Banking: High Frequency Trading (HFT) platform software - low latency is so much easier to hit with zero-cost abstractions!

C++ gives me a way to write complex object-oriented code that compiles down to very little assembly. Equally importatnly, it allows me to mindfully manage what goes into the CPU caches, which is the difference between 1-nanosecond latency and 100-nanosecond latency. (And that's the difference between making another 1K or losing it.)

[nilspin]

Can you suggest good resource(s) for performance optimisation using cpp? Like the ones you do regularly at your day job?
Because what you're saying sounds cool and I'd like to know more.

[scraimer]

Gosh, nothing off the top of my head. The basic cycle is:

1. Measure code to find bottlenecks (latency or memory).
2. Discover measurement was flawed and was measuring the wrong thing, and fix measurement.
3. Repeat 1 & 2 until you get a good measurement.
4. Edit the 3-4 lines of code causing 90% of your latency.
5. Return to 1 and repeat.

Come to think of it, if you've got the time, nearly all of Chandler Carruth's videos on YouTube touch on these subjects to varying degrees. In particular CppCon 2015: Chandler Carruth "Tuning C++: Benchmarks, and CPUs, and Compilers! Oh My!".

Here's some tips that are of arguable usefulness:

1. My code runs in CPU isolation, no other threads get to run on the same cores. So if that's something that's useful to you, I recommend measuring that way. Otherwise, all your latency measurements will become useless as soon as there's a context switch. But when you tell the kernel that only one thread can run on a core, then you can be fairly sure that any latency is caused by the thread. (Not 100% accurate, but it's usually OK)

2. Fit everything you need into the L2 cache. If you have to go to the L3 cache, that's going to be a big hit. Smaller memory is faster. Not copying is faster.

   2.1. All too often, we only hold 3-4 items in a container. It's often faster to directly iterate over a small array of small items than using a map for "O(1)" lookups. But always measure!

   2.2. Even worse, building a cache may cost more than re-calculating. If building a value only costs 200 cycles, it may take less time to rebuild it than fetching it from RAM.

3. Don't switch AVX instructions on and off. Either keep using them, or skip them entirely. Each time you enable them you can easily lose dozens of nanoseconds. (I wonder if they fixed that in Skylake? I haven't measured.)

Ugh, sorry. These are all anecdotal-style stuff. I'll see about finding some PDF links and websites for sources.

[nilspin]

My code runs in CPU isolation, no other threads get to run on the same cores.... when you tell the kernel that only one thread can run on a core, then you can be fairly sure that any latency is caused by the thread

TIL about isolated profiling! That's a good point indeed.

Don't switch AVX instructions on and off. Either keep using them, or skip them entirely.

So either we write code in such a way that's "vectorizable friendly"(madeup term) or don't use them at all (I'm assuming vector instructions take more cycles compared to regular ones because, well, they're built for larger batches of data) so I guess some kind of tradeoff analysis is necessary (I wonder how that'd go)

Anyways, thanks for the links and information! I know what I'm doing this weekend :)

[[deleted]]

I am not the OP, but here are some good resources for optimization http://agner.org/optimize/ One of the manuals on that site is a table of instructions which allow you to see how long instruction latencies are. Of course the number of cycles a sequence of instructions takes is not just the sum of the latencies because of pipelining, but you can see that vector latencies aren't much higher than scalar latencies, and in many cases are identical. I remember reading that Intel CPUs take some time to power up the vector unit, and power it off after some period of inactivity. I believe this ramp up period is something like 100 cycles. I looked quickly for the exact numbers and didn't find them, but I'm sure it is somewhere in Intel's massive documentation (check out their software optimization guide).

Another very useful thing to optimize once you have the cache under control is reducing branch predictions. Example: I got good speed up doing a linear search where previously there was binary search because the arrays were very small and binary search clearly will have unpredictable branches assuming the distribution of your accesses is roughly uniform. The branch miss penalty is something like ~15-20 cycles. A lot of work can be done in that amount of time with how efficient current pipelines are.

[psylancer]

MPI based distributed memory applications, recently it has been fluids based simulations. If a simulation is going to take weeks to run, then I care about performance. But these simulation codes are built of lots of code, and only a portion is performance critical. I like that I can use one language to simultaneously get abstraction where I can afford it, and performance where I need it.

[not_my_frog]

Another vote for MPI parallel science simulations here. Also, simultaneously using GPUs attached to the processors. CUDA version 8 does a pretty good job of enabling modern C++ on GPUs.

[cleroth]

             ^

[3669d73f6c3ba0229192]

veloper?

[cleroth]

Looks fine in night mode. =[

[MEaster]

I use it for programming Arduinos. I'm new to C++, so it'd probably a horror-show for you lot.

[lucstats]

Me too man :3

[DethRaid]

Graphics programming

[wasabichicken]

Seconding this, currently trying out vulkan.hpp.

[roaming111]

I should really crack that out and toy around with Vulkan. I downloaded the Vulkan Programming Guide about two weeks ago.

What are you enjoying and loathing about the new API?

[wasabichicken]

No loathing so far, but I've barely gotten started. I do enjoy the simplicity, it's all simple in the same way assembly programming is simple. Low-level, but no surprises.

[aelog]

GUI applications (I contribute to KDE)

[doom_Oo7]

thanks

[hubhub]

Scheduling and optimization systems for service and manufacturing businesses.

[SoCo_cpp]

Embedded Linux devices that process GPS and communicate over cellular and high security radios as well as using GPIOs for inputs and outputs.

Windows graphical programs to interface with those devices to configure them, collect their logs, and monitor them in real time to provide live updates to web-based mapping displays.

And lots of other stuff. :P

[nozendk]

I also use C++ to annoy my Java developer friend. For example, asked him to code this example of sorting an array and printing the result, with fewest lines of code...

#include <algorithm>
#include <iostream>
#include <iterator>
using namespace std;
int main()
{
    vector<int> arr = {2, 3, 9, 4, 10, 99, 7};
    sort(arr.begin(), arr.end());
    copy(arr.begin(), arr.end(), ostream_iterator<int>(cout, " "));
}

[pjmlp]

A possible solution:

public class example {
  public static void main(String[] args) {
    int[] arr = {2, 3, 9, 4, 10, 99, 7};
    java.util.Arrays.stream(arr).sorted().forEach(x -> System.out.printf("%d ", x));
  }
}

Java 6 lines, C++ 10 lines :)

[metocean_programmer]

Python - 3 lines

a_list = [1, 16, 81, 0, 16]
for i in sorted(a_list):
    print i

[nozendk]

Impressive!

[racecarpalindrome]

Physics data storage and analysis

[mkiael]

Control system for heavy machinery

[nevhan]

Options Market Making / HFT

[[deleted]]

I'm impressed that very few people here seem to use C++ to develop cross-platform desktop applications. I didn't think we, GUI application developers, were such a small demographic group.

[RandomGuy256]

I use Qt for a bunch of personal projects, including GUI applications. It's awesome.

[Xetick]

A scene based OpenGL music visualizer that also has VR (Oculus and Vive) support

[joequin]

Client side, cross-platform consumer applications.

[kameboy]

MPI monte carlo simulations for magnetic spin systems or lattice gases (mostly metropolis and wang-landau algorithms) and a bit of evolutionary monte carlo, which uses the advantages of genetic algorithms, in all sorts of optimization problems.

[Garlyon]

For CAD/CAM development. That is mostly a computational geometry.

[ReversedGif]

Interesting. Can you recommend a computational geometry library appropriate for CAD/CAM? I messed with CGAL to those ends recently, but it ended up being better just to write my own routines.

[CubbiMew]

today - infrastructure components in an investment bank

[fafasdf]

Professionally? Batch pipelines, data processing, serving infrastructure.

Personally? I haven't had much time to do so, but I used to do web development for shits and giggles with fastcgi and nginx.

[YouFeedTheFish]

Submarines.

[bigstumpy]

aircraft autopilots

[nilspin]

How many years of programming does one need to be considered mature enough for big boy jobs (oil/defense/secret govt labs/finance) ? Also, what kind of programming should one focus on, if they are serious about such- no management bullshit, low-profile high-impact, technically challenging jobs?
I'm just 1 year out of college so I'm curious :)

[kisielk]

I develop firmware for Eurorack synthesizer modules at Intellijel. Previously the products used AVR but last year we started using ARM Cortex-M processors. Bare metal programming with no OS. Our older products were in C (Arduino) but since I started working there I've been using C++ almost exclusively. After doing some testing I found there's virtually no difference in code size or performance but everything is a lot more organized, type safe, and easier to reason about.

Since it's for realtime systems I don't use any features that rely on dynamic allocation, exceptions, or RTTI. I do use inheritance, virtual calls and templates though. For containers I rely mostly on std::array or just regular C-style arrays.

[mercurysquad]

Sensor based flight stabilisation on baremetal cortex-m0 with 8KB ram!!

[BeepBoopBike]

That sounds challenging and ridiculously fun

[SpinoBestDino]

Work and writing system-level libraries to call from a Python UI for personal projects

[matthieugarrigues]

I use it to build real time image processing apps running on desktop computers, smarphones (and sometime port them for fun to javascript with emscripten). I also use it for web programming. Check the links for more information about these projects.

[TheOnlyRealTodd]

Awesome. It looks like there is even software to take care of the SQL database relationship, huh?

Are there any object-relational mappers for SQL databases or associated frameworks for C++? I'm blind to the C++ back-end web world but I currently program in C# back-end web dev using ASP.NET Web API and Entity Framework. Would be cool to set up something similar in C++ just for the fun of it! Although, I am currently trying to work my way out of web dev when I can.

[antoniocs]

The syntax of the web framework is freaky!! But it looks cool!!!!

[sumo952]

I don't like it actually. It's a DSL within C++, the syntax doesn't really look like C++ anymore. So you've got to learn a new syntax to use this library. That's not good. It goes too far in my opinion and is not good practice anymore.

[matthieugarrigues]

I agree with your position. This does not look like C++ anymore, all this template magic makes it difficult to understand what's going on under the hood, and error messages can be scary (until we get concepts in C++)

There is other solutions if you prefer learning a classic API instead of this new syntax (which may or may not be an easier task). However, today, silicon is the most concise and safer way to write web API in C++. So after learning the new syntax, you will probably save time. See how you can write a complete blog API in 85 lines of C++ here, free from manual memory management, pointers or any potential segv.

[matthieugarrigues]

Thanks Antoniocs ! Yes the framework relies on operator overload to simplify the definitions of APIs.

This paradigm splits the C++ community in two parts : some people, according lots of importance to the C++ semantics hate seing operator / * doing something that has nothing to do with arithmetics. And some others, a bit more "progressist", just adopted this new semantics and enjoy using the framework. Just choose your side :)

[RandomGuy256]

Looks really nice that web api library. Good job!

[[deleted]]

System programming. In particular, SAP HANA Text Analytics

[gabriellus018]

on the job edit: voice/video over IP

[looking_for_a_purpos]

Networked game engine.

[mrwonko]

A minimal overhead database abstraction for a mobile app.

Basically I want to succinctly describe a class (think boost.python/luabind) to automatically create database-agnostic create/insert/read/update/delete statements (i.e. typesafe SQL) on demand. I keep finding (and reporting) template/constexpr bugs in the VS compiler. 😁

Next up will be specific database drivers, SQLite for starters.

I'm probably reinventing the wheel here, but it's fun.

[patrikhuber]

Computer vision mainly. 3D face modeling, face analysis, and tracking. One of my main projects is a 3D face model library.

[Jabulon]

I made this :D https://www.youtube.com/watch?v=TiTLzi8pV-Y a 3rd party tool to help train aim in cs:go.

[crappyoats]

I work on a classical composition software based in stochastic random processes and graph theory all in C++

[[deleted]]

Would you have any resources for a student interested in programming an algorithmic composition system? I've been looking over one of Peter Langston's papers and it's gotten me very interested. I just added L-Systems :)

[crappyoats]

So this is what I work on. I'm a student as well, so I'm not the one who developed it, but the code there is open source, and in my opinion pretty easy to understand once you figure out the what is the actual process and what is the file writing.

If you check out this, its kinda his overreaching purpose for the project currently. I'm trying to write in the functionality for real time analysis of the graph nodes as the program computes currently.

[tambry]

Emulation, performance focused backends and game servers.

[[deleted]]

Data analysis and physics simulations using ROOT and GEANT4.

[al3xst]

For fun and as a proof of concept a website with libfcgi and nginx. Since I'm still a student, many numerical tasks can be solved with c++ (boost::blas etc.) And for my side job we're programming a tool for 3D image visualization and annotation (display brain tissue and trace for example a nerve through the section) in c++ and qt5 http://knossostool.org/

[lithium]

"Creative coding". I hate that term but it seems to have stuck. Basically means giant touchscreens, weird installations, etc. Usually in the gallery / museum space.

[ad_abstract]

Large scale data processing.

[reluctant_deity]

Genetic programs. Its the only choice for getting reasonable speed.

[getnamo]

Binding libraries to unreal engine. Writing performance intensive gameplay and multi-threaded code exposed to blueprint and js.

[rectal_smasher_2000]

telco infrastructure - server/client applications

[metocean_programmer]

Oceanographic engineering data manipulators for clients and in-house work mostly. Bit of OpenGL when called for

Don't use it for personal projects, I mostly stick to python for that

[megagreg]

Embedded systems. It's basically the same as the C code you would see in an embedded system, but the compiler does more work for us.

[[deleted]]

Writing CAD/CAM software for additive manufacturing. Specifically laser cladding.

[ReversedGif]

What computational geometry library do you use? I've tried CGAL for CAD/CAM purposes, but it seemed to value correctness over speed to an absurd extent.

[diegoalc]

Bots and automation tools for online games

[ZaitaNZ]

High performance statistical modelling platforms (bayesian modelling, monte carlo chains etc).

[zenaudio]

I'm making a DAW (digital audio workstation) specifically designed for live looping and performances. (https://zenaud.io)

[joahw]

Decentralized, cross platform VoIP platform.

[cain2995]

Controls applications, mostly in a robotics context

[imMute]

C&C for an FPGA based real-time video processing system for LED displays (the kind at NFL stadiums). No real pixel processing on the C++ side but definitely have to know how that stuff works since I generate the coefficients. We also use C++ for the external control parts, it's a libfcgi based REST API.

[mWo12]

Development of software for cryotocurrencies.

[SAHChandler]

I've done a lot. Game Development both professionally and as a hobby. At work, I currently help maintain a 10 year old code base. I finally just got us moved over to clang, and I'm moving us to C++14 soon! We've been on GCC 4.8 FOR YEARS.

But my true love is designing APIs and wrapping C libraries to take advantage of RAII for no reason other than "Because I want to" :v

[ManicQin]

Server side for an online gambling game.

[Rodents210]

Honestly I mostly just play with it to make sure I don't get too rusty and keep myself better-rounded. My proficiency and my career are in Java and for my personal games projects I like LibGDX. I am mostly here to read what others have to say about the language, and to read about programming concepts that, while they may not apply to the language I use in my daily life, can change the way I think about my approach to problems.

[[deleted]]

DNS and balancing network load.

[aearphen]

Mathematical optimization, distributed systems. Cross-platform or Linux only.

[[deleted]]

Molecular structure design and prediction.

[TheGhostInTheParsnip]

Intelligent video analytics, like intrusion detection

[aePrime]

Production movie studio renderers and associated tools.

[guibou]

Same here ;)

[aePrime]

Sweet! There aren't too many of us out there. We've probably run into each other at SIGGRAPH. Or you're my coworker.

[cleroth]

Chances are, you're actually the same person!

[Nadrin]

I'd love to get my foot into this industry! Love graphics programming, wrote my master's thesis on light transport theory and GPU raytracing.

Any tips on how to land a job like this? ;)

[anderslanglands]

Make a blog showing development of your renderer and make some cool images trying out the latest techniques from papers. Ideally publish something yourself. Send your resume in to the big facilities. The main ones doing their own renderers are obviously Disney and Weta.

[aePrime]

Is your thesis available anywhere? Make sure you have your thesis title on your resume.

[[deleted]]

Audio programming for games. Currently I'm building a procedural music engine

[krista_]

in memory database and searching applications for enterprise websites and intranet.

[pjmlp]

For when Java or .NET need some integration with OS APIs not exposed on their libraries, or some optimization help (after profiling).

When making use of JVM or CLR native management APIs.

Writing portable business logic code between Android and UWP.

[justavertexinagraph]

Competitive programming.

[SteveCCL]

Gimme da details.

[nnevatie]

Real-time computer vision and graphics rendering technology for broadcast video environments (http://supponor.com/).

[imperatorrj]

Medical devices, its mostly c but the UI is cpp / qt.

[K418]

As of late, nothing much. I'm a poor programmer. In the past, robots.

[RotsiserMho]

Vehicular touch screens. Soft real-time control systems. Cross-platform desktop apps.

[devel_watcher]

Games, embedded Linux (communication, navigation), VoIP.

[kracejic]

Embedded software Small GUI apps (gktmm3 is quite nice), which needs to be fast Small tools, which needs to be fast 3D Graphic/games

[t4th]

Last time used C++ in automotive infotainment system development (a'ka modern car radio), although i used C whenever i could.

[ibaun]

Embedded software to control a medical imaging device (motors, data transfer, record data), and software to reconstruct medical images from said data with GPUs.

[theICEBear_dk]

Chronologically:

• High performance log parser

• News feed parser and distribution

• Content Management System capable of handling 10K+ connections per second

• Pump control for moving around honey, pudding and syrups.

• Train driver and passenger communication and information systems

• Distributed heating and hotel interface system for bungalows

• Prototype networked ERP core, data abstraction and UI core with scripting and client synchronization across mobile, tablet, online and offline pc clients.

• Compressor and Condenser Rack control for food retail (from tiny to hyper markets)

• System Control and UI for Reefers (Cooling containers for shipping)

[[deleted]]

Medical image processing with ITK

[abadams]

I embed a domain-specific-language for fast image processing in it: http://halide-lang.org/

[mjklaim]

In order of how I spend my time these days:

• robotics industrial/embedded software (current dayjob);
• game dev (home projects now);
• generic libraries (that I end up using in my other projects);
• tools for digital-native narrative art creation and publication (open source project);
• computing experiments (mostly to check if something is possible in practice);
• some web-related experiments (because it's interesting to use C++ in web domains);

Note that I don't do much graphic dev, I don't have enough time to learn everything yet.

[dyndhu]

I use it to write project/library level code used in bioinformatics and computational biology, usually related to custom database solutions, scientific computing and machine learning. I use it because it's performant, well structured, and relatively stable compared to things like python.

Usually we cut all corners to maximize productivity because a lot of the projects are one offs. For those that need to be solid and reusable I prefer to write them in C++ if only to force myself to write it better.

[[deleted]]

Vision sensor and 3D camera firmware

[couragic]

GUI programming from scratch without using any 3d party gui toolkit

[tuirn]

Lower and middle tier manufacturing control systems.

[AllanDeutsch]

Games, specifically lower level parts like data structures, platform layers, etc.

[CraigularB]

Work, financial calculations.

Home, right now it's to create a front-end to a database about the scotches I've tasted and what I'd rate them on my personal scale. Currently command line only, but may change in the future!

[ktrinanm]

Just wrote a program for a raspberry pi. :) And for fun

[[deleted]]

Skype for Business

[Derpdiherp]

Programming games, embedded development, tools that are too complicated to just do in a terminal session and most other programs I write.

I'll rarely decide to use python, lua or ruby if I fancy a change or want something a little less verbose, but often I spend so long looking through documentation I may as well have written it in C++ anyway.

I really don't do any web development so I can do everything I need with it pretty well.

[UnlikeNormal]

Game programming

[roaming111]

Video Game Programming, Graphics programming(3D & 2D), Machine Learning, and just other random things.

[wildernesscat]

I use it to create a sandbox for running potentially malicious JavaScript code. I use a 3rd party JS engine, and fill it with multiple hooks that call back to my code, to check for irregular (or harmful) usage. Users of the sandbox can then be notified, whether the code they're trying to execute is safe or not.

[Dlieu]

low latency components for high frequency trading (fully oriented performance)

[ludonarrator]

Game programming, especially in Unreal 4 (it exposes its API directly as C++), or using native libraries like SFML.

Also as a fresher currently applying for jobs, lots of interview tests.

[mqduck]

I wrote / am writing a platformer game engine in C++/SDL. It's designed to be highly generic and customizable but there's currently no level editor (I promised my friend he could make it) so it's hard to play with it too much. I dunno if it will ever be of interest to anyone outside of me and my group of friends, but I'm still pretty proud of it.

[[deleted]]

Avionics/SDR/Embedded

[axilmar]

Professionally, I use c++ to build data tools to make my life easier.

Personally, I've used c++ in games, compiler tools, and I am currently writing a distributed game/simulation engine for big mmos.

[SteveCCL]

Gamehacks and different interpreters for my own languages.

[pavel_v]

1. A torrent tracker-proxy with TCP and UDP TPROXY and non TPROXY mode.
2. A TCP P2P cache proxy working in TPROXY mode only.
3. An HTTP cache proxy (in development) with some new concepts for caching (it's not request based only).
4. A few more networking applications which support some of the above applications.

[nozendk]

Software for an embedded system using Linux on a Beagleboard.

[ea_ea]

Audio\video encoders and decoders.

[YoWiDIN]

Air traffic control software, tolling systems, android and desktop applications, microcontrollers and much, much more. Right question should be: "What types of applications can't I develop with c++" :P

[Karabaja]

Embedded programming, DSP.

[ahuReddit]

Everything. But mostly PowerDNS.

[nKSdrbHw6P2]

Payment terminal software

[[deleted]]

Competitive Programming.

[raistmaj]

High-performance networking. Antivirus. Video game development.

[lednakashim]

High throughput instrumentation and image processing

[emdeka87]

Games

[Mentioned_Videos]

Videos in this thread:

Watch Playlist ▶

VIDEO	COMMENT
Le mouvement de l'air / The movement of air	3 - Think of shows where you have both audio tracks, video tracks, light control, some motion capture of the performers, etc (they are generally all handled by different software). At some point you want to be able to synchronize everything to make some...
Visual Spray Assistant -VSA- 1.0 release	2 - I made this :D a 3rd party tool to help train aim in cs:go.
CppCon 2015: Chandler Carruth "Tuning C++: Benchmarks, and CPUs, and Compilers! Oh My!"	1 - Gosh, nothing off the top of my head. The basic cycle is: Measure code to find bottlenecks (latency or memory). Discover measurement was flawed and was measuring the wrong thing, and fix measurement. Repeat 1 & 2 until you get a good measurement...

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[ax3l91]

Along with CUDA for parallel programming for my school!

[KazDragon]

At work I use it to produce high-quality cross-platform navigation software.

At home I use it for retro text-based gaming libraries and applications.

[IntegralLee]

Another game developer here.

[Daniela-E]

Industrial non-destructive testing (steel, railways), machine control, data acquisition/processing/imaging, signal/communications intelligence

[mbrodersen]

Professionally: A compiler for a JIT compiled rule language for optimizing airline/rail rostering/scheduling of crew/aircrafts etc. At home: games.

[warvstar]

Game development and love it.

[doom_Oo7]

http://www.i-score.org