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

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14
votes
7answers
3k views

Are header files actually good? [closed]

I find header files to be useful when browsing C++ source files, because they give a "summary" of all the functions and data members in a class. Why do so many other languages (like Ruby, Python, ...
4
votes
2answers
347 views

What is the lifecycle for loading a Linux Desktop Environment?

I'm looking into delving into a bit of custom OS work (and yes I understand that doing any development at the DE level or lower on an OS is extremely complex and not a light thing to undertake, ...
16
votes
1answer
2k views

Motivation and pitfalls (?) of the auto keyword in C++11

I was recently wondering why the keyword auto was chosen in C++11 to mark a variable whose type must be inferred by the compiler, like in auto x = 1; Since var seems more common in other ...
16
votes
5answers
4k views

Why don't modern libraries use OOP

I'm a beginner-level C++ programmer, but I understand the concepts of the language fairly well. When I began to learn external C++ libraries, like SDL, OpenGL (maybe something else too), to my great ...
6
votes
1answer
2k views

sqrt c# vs sqrt c++

Any idea why the C# version of sqrt (System.Math.Sqrt) is ~10 times slower than c++ version ? Furthermore, C# version seems to have one extra digit of precision. I have run my test under MSVC2012. I ...
3
votes
1answer
1k views

C++ Design: Functional Programming vs OOP

Design Question Recently, I've been doing more and more FP in C++, mostly in the form of function templates and lambdas, and heavy overloading of a single function name. I really like FP for some ...
1
vote
1answer
326 views

Scientific software design [closed]

I asked this question over at stackoverflow and it was suggested a tighter form be posted here. Many early career numerical researchers face the prospect of having to create performance critical ...
8
votes
4answers
1k views

Java style classes in c++

I came across this article proposing a style of coding in c++ that looks a bit weird at first. But after reading it over and pondering for a bit I'm really considering giving it a try. The most ...
3
votes
1answer
544 views

Encapsulate bitmap (*.bmp) as C++ class

How would you implement / design a class which has to represent a bitmap? I'm stuck at handling the different possible color modes and I keep thinking that this should be somehow implementable using ...
80
votes
13answers
11k views

Does auto make C++ code harder to understand?

I saw a conference by Herb Sutter where he encourages every C++ programmer to use auto. I had to read C# code some time ago where var was extensively used and the code was very hard to ...
1
vote
1answer
72 views

Term for a single C++ endpoint/object file

I have heard several terms for a C++ "Codepoint" (which is what I've heard used the most often), or a .cpp file that is compiled into an object file. For instance, .cpp files can include other .cpp ...
9
votes
2answers
931 views

Refactoring several huge C++ classes / methods. How to start? [duplicate]

Possible Duplicate: I’ve inherited 200K lines of spaghetti code — what now? I'm dealing with legacy code. It contains some BIG classes (line count 8000+) and some BIG methods (line count ...
11
votes
8answers
1k views

Does low latency code sometimes have to be “ugly”?

(This is mainly aimed at those who have specific knowledge of low latency systems, to avoid people just answering with unsubstantiated opinions). Do you feel there is a trade-off between writing ...
3
votes
3answers
340 views

is Microsoft LC random generator patented?

I need a very simple pseudo random generator (no any specific quality requirements) and I found Microsoft's variant of LCG algorithm used for rand() C runtime library function fit my needs (gcc's one ...
3
votes
3answers
2k views

C++ Pointers: Number of levels of Indirection

In a C++ program that doesn't contain legacy C code, is there a guideline regarding the maximum number of levels of indirection that should be used in the source code? I know that in C (as opposed to ...
-1
votes
1answer
629 views

Benefit of C++ to System Administrators [closed]

What benefit could C++ bring to system administrators? I am working on Windows and Ubuntu. If I learn C++, where could I implement it in system administration, Please specify some of its benefits.
-1
votes
2answers
948 views

What are the ways to start making actual/real-world programs using Java/C++ to excel my Programming Skills? [duplicate]

Possible Duplicate: How do I improve my coding skills? How I do become a better programmer as a junior developer The programming that we learn at university is not that vast, like those ...
2
votes
2answers
105 views

share code between check and process methods

My job is to refactor an old library for GIS vector data processing. The main class encapsulates a collection of building outlines, and offers different methods for checking data consistency. Those ...
17
votes
13answers
5k views

Why do operating systems do low level stuff in C and C++? Why not just C++?

On the Wikipedia page for Windows, it states the Windows is written in Assembly for the bootloader and task switcher, and C and C++ for kernel routines. IIRC, you can call C++ functions from an ...
12
votes
6answers
589 views

OO Design, how to model Tonal Harmony?

I have started to write a program in C++ 11 that would analyse chords, scales, and harmony. The biggest problem I am having in my design phase, is that the note 'C' is a note, a type of chord (Cmaj, ...
0
votes
1answer
508 views

Increase the size of a memory mapped file

I am maintaning a memory mapped file to store my tree like datastructure. When I'm updating the datastructure ,I got this problem. The file is limited on it's size and can't be too long or too small. ...
10
votes
2answers
1k views

Why is using C++ libraries so complicated?

First of all, I want to note I love C++ and I'm one of those people who thinks it is easier to code in C++ than Java. Except for one tiny thing: libraries. In Java you can simply add some jar to the ...
9
votes
7answers
4k views

Is it a bad practice to include all the enums in one file and use it in multiple classes?

I'm an aspiring game developer, I work on occasional indie games, and for a while I've been doing something which seemed like a bad practice at first, but I really want to get an answer from some ...
0
votes
5answers
551 views

should singleton be life-time available or should it be destroyable?

Should the singleton be designed so that it can be created and destroyed at any time in program or should it be created so that it is available in life-time of program. Which one is best practice? ...
2
votes
7answers
1k views

Is there a quick and practical (hands on) way to learn another programming language? [closed]

Due to rather strange circumstances, I only have until Monday to learn (at least) the basics of PHP and .NET programming. I'm already fairly competent (though there is a lot of room for improvement) ...
0
votes
2answers
399 views

What kind of specific projects can I do to master bitwise operations in C++? Also is there a canonical book? [closed]

I don't use C++ or bitwise operations at my current job but I'm thinking of applying to companies where it is a requirement to be fluent with them (on their tests anyway). So my question is: Can ...
2
votes
2answers
122 views

Order of executions in C++ streams

It is obvious that first cout prints 7 7 but why the second one prints 8 8 7 ? Why not 7 8 8? How does such constructions work in c++? int ink(int *x){ *x += 1; return *x; } int main(){ ...
6
votes
3answers
3k views

How do you handle increasingly long compile times when working with templates?

I use Visual Studio 2012 and he have cases where we added templates parameters to a class "just" in order to introduce a "seam point" so that in unit-test we can replace those parts with mock objects. ...
23
votes
2answers
10k views

Will C# merge with native C++ compiler? [closed]

According to this post : http://channel9.msdn.com/Forums/Coffeehouse/MS-working-on-a-same-compiler-for-C-AND-C--Not-in-incubation-but-for-production- How much truth is in this post? Should it be ...
5
votes
3answers
859 views

Tension between the dependency inversion principle and avoiding “new” in C++?

I have seen a lot of advice that it is better to do Type object; than Type* object = new Type(); in C++ whenever possible—i.e., minimize your use of new. I understand the rational behind this and ...
1
vote
1answer
385 views

Where does the “mm” come from in GTKmm, glibmm, etc

I understand that the "mm" suffix [in various GTK-associated C++ binding libraries] means "minus minus," but where exactly does it come from? I understand that there is a programming language called ...
-1
votes
1answer
596 views

How to move a car around an environment with hills in C++?

I don't have any code for this since I don't know how I am meant to do this. I have a car and I am able to move it around on a flat plane and I have that working correctly. However, I want it to also ...
0
votes
1answer
1k views

How can I use UML to model a relationship between two classes, where one has functions exposed as friend to the other?

I have a two classes: ------------ --------------- X Y ------------ --------------- ...
0
votes
1answer
328 views

What are some books that explain low level stuff like com interfaces, dll injection etc? [closed]

What are some books that explain low level stuff like com interfaces, dll injection etc? Basically low level windows programming. Searching on amazon gives me hacking books/10+ year old books which is ...
3
votes
2answers
492 views

How do .so files avoid problems associated with passing header-only templates like MS dll files have?

Based on the discussion around this question. I'd like to know how .so files/the ELF format/the gcc toolchain avoid problems passing classes defined purely in header files (like the std library). ...
21
votes
3answers
4k views

Did C++11 address concerns passing std lib objects between dynamic/shared library boundaries? (ie dlls and so)?

One of my major complaints about C++ is how hard in practice it is to pass std library objects outside of dynamic library (ie dll/so) boundaries. The std library is often header-only. Which is great ...
8
votes
7answers
1k views

Is Java much harder to “tweak” for performance compared with C/C++?

Does the "magic" of the JVM hinder the influence a programmer has over micro-optimisations in Java? I recently read in C++ sometimes the ordering of the data members can provide optimizations ...
-1
votes
1answer
1k views

C++ job interview questions? [closed]

I am expecting a job interview for a C++, what kind of questions should I expect? I have been programming with C for 5 years. I know what OOP is and I have been reading about it for some time. But ...
34
votes
6answers
18k views

Why does Facebook convert PHP code to C++? [closed]

I read that Facebook started out in PHP, and then to gain speed, they now compile PHP as C++ code. If that's the case why don't they: Just program in c++? Surely there must be SOME errors/bugs when ...
8
votes
5answers
1k views

“Programming error” exceptions - Is my approach sound?

I am currently trying to improve my use of exceptions, and found the important distinction between exceptions that signify programming errors (e.g. someone passed null as argument, or called a method ...
3
votes
1answer
600 views

Brief material on C++ object-lifetime management and on passing and returning values/references [closed]

I was wondering if anybody can point to a post, pdf, or excerpt of a book containing the rules for C++ variable life-times and best practices for passing and returning function parameters. Things like ...
1
vote
2answers
312 views

What is a useful pattern to maintaining an object state in a one to many relationship?

I am looking for a design for my application, here are the players(classes) involved. struct Transform { // Uses a matrix to transform the position. // Also acts acts as the state of a ...
11
votes
4answers
8k views

C++ - Constructor or Initialize Method to Startup [duplicate]

Possible Duplicate: Avoid having an initialization method I want to determine when to do non-trivial initialization of a class. I see two times to do initialization: constructor and other ...
4
votes
7answers
2k views

Programming Interview : How to debug a program? [closed]

I was recently asked the following question in an interview : How do you debug a C++ program ? I started by explaining that programs may have syntax and semantic errors. Compiler reports the ...
1
vote
3answers
294 views

Programming C++ using Qt4 [closed]

Hey guys I am really new to the C++ programing I have a little knowledge in C and a bit more in C++, but I do not know them enough to call myself a programmer. I am working as a PHP Web Developer I ...
3
votes
2answers
359 views

Clarification on the Strategy Pattern

I've just been reading through some basic design patterns, Could someone tell me if the term "strategy pattern" only applies if your implementing a completely abstract interface? What about when ...
1
vote
1answer
588 views

How can you become a real programming polyglot? [closed]

I work as a Java programmer, but C and C++ were always my favourite languages during studies. Unfortunatelly I don't have an opportunity to work with them as often as I would like to. As a result I ...
6
votes
2answers
264 views

What would be a non-contrived reason to have an object with Private Copy Constructor as well as Assignment Operator?

Looking for non-conceptual/non-contrived reasons of when one would need to use an object with both a private copy constructor and a private assignment operator? As in what problem does this ...
2
votes
1answer
370 views

Brief explanation for executables in a GNU/Clang Toolchain?

I roughly understand that cc, ld and other parts are called in a certain sequence according to schemes like Makefiles etc. Some of those commands are used to generate those configs and Makefiles. And ...
4
votes
3answers
852 views

Round Table - Minimum Cost Algorithm

Problem Link - http://www.iarcs.org.in/zco2013/index.php/problems/ROUNDTABLE It's dinner time in Castle Camelot, and the fearsome Knights of the Round Table are clamouring for dessert. You, the ...