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

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13
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2answers
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Best overview to modern C++ paradigms? [closed]

I used to write C++ extensively between 8 and 10 years ago. I have since moved on to C# for professional reasons. However, from time to time I see statements like "If you're still manually ...
9
votes
5answers
12k views

Why can you have the method definition inside the header file in C++ when in C you cannot?

In C, you cannot have the function definition/implementation inside the header file. However, in C++ you can have full method implementation inside the header file. Why is the behaviour different?
9
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1answer
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What is “friend” keyword used for?

Can you explain to me why the friend keyword is preferred for giving access rights to private data of class?
21
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6answers
3k views

C++ Renaissance - marketing slogan? [duplicate]

Possible Duplicate: What does the latest “C++ Renaissance” mean? Lately, I hear a lot about C++ Renaissance. What is that? C++ is currently undergoing a renaissance. This means ...
21
votes
11answers
2k 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 "...
16
votes
4answers
11k 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 ...
16
votes
6answers
7k views

The rule of 5 - to use it or not?

The rule of 3 (the rule of 5 in the new c++ standard) states : If you need to explicitly declare either the destructor, copy constructor or copy assignment operator yourself, you probably need to ...
12
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3answers
3k views

Class Versus Struct

In C++ and other influenced languages there is a construct called Structure (struct), and another called the class. Both are capable of holding functions and variables. Some differences are: Class ...
9
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3answers
2k views

Achieving forward compatibility with C++11

I work on a large software application that must run on several platforms. Some of these platforms support some features of C++11 (e.g. MSVS 2010) and some don't support any (e.g. GCC 4.3.x). I ...
8
votes
4answers
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When to import names into the global namespace? (using x::y, from x import y etc.)

I've been programming in various languages for about 10 years now. And I still haven't figured out when it is a good idea to import something into the global namespace (using x::y in C++, from x ...
7
votes
8answers
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What is the use-case to use C++ friend class?

I am trying to understand C++ friend. When is the good use case to use friend? I suppose if we want to let another class have access to another classes attributes, why don't we just make it as public ...
5
votes
6answers
9k views

When is C a better choice than C++? [closed]

I can't imagine that there's any reason not to use the OOP features of C++. It's is just as fast as C, and - what's more important to me - it's transparent, just as C. (I mean "transparent" that I ...
4
votes
4answers
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What are the arguments for/against Code Generation?

I'm in a position where we've got some brittle code that constructs SQL-like queries via text concatenation with parameters for inputs. The data source that it queries is fast and scalable but lacking ...
4
votes
2answers
1k views

How do you usually compile C/C++ source code ? (Large code bases) [closed]

It's been quite some times since I began learning C and C++ but I've been very limited only to the Windows platform and the Visual Studio environment. Recently, I wanted to look into some open source ...
3
votes
2answers
4k views

Storing a pass-by-reference parameter as a pointer - Bad practice?

I recently came across the following pattern in an API I've been forced to use: class SomeObject { public: // Constructor. SomeObject(bool copy = false); // Set a value. void ...
22
votes
10answers
9k views

Do we still have a case against the goto statement? [duplicate]

Possible Duplicate: Is it ever worthwhile using goto? In a recent article, Andrew Koenig writes: When asked why goto statements are harmful, most programmers will say something like "...
20
votes
5answers
6k views

Is it a good idea to “#define me (*this)”?

This macro can be defined in some global header, or better, as a compiler command line parameter: #define me (*this) And some usage example: some_header.h: inline void Update() { /* ... */ } ...
18
votes
8answers
2k views

Why do books say, “the compiler allocates space for variables in memory”?

Why do books say, "the compiler allocates space for variables in memory". Isn't it the executable which does that? I mean, for example, if I write the following program, #include <iostream> ...
18
votes
11answers
2k views

Is pure oop necessary [closed]

Please don't direct me to this post: http://stackoverflow.com/questions/1551/how-to-think-in-oo. I have read it and still have no answer. I have programmed c++ for years and was taught that ...
17
votes
6answers
2k views

Is it a good habit to use C expressions in C++ code?

At school we started learning C this year, despite the fact I'm way ahead of class, and I learned Java, C++ and C while the class is at the base of C. Anyhow, I've been documenting myself, reading ...
14
votes
3answers
25k views

Best practices for constants [closed]

How do you guys handle constants, especially in Java (static final) and C++ (define)? Do you use dedicated headers (C++) or classes (Java) for all constants? Do you turn all literal values into ...
12
votes
4answers
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Object Oriented Programming: getters/setters or logical names

I'm currently thinking about an interface to a class I'm writing. This class contains styles for a character, for example whether the character is bold, italic, underlined, etc. I've been debating ...
10
votes
2answers
599 views

Single-responsibility and custom data types

In the past months I've asked for people here on SE and on other sites offer me some constructive criticism regarding my code. There's one thing that kept popping out almost every time and I still don'...
10
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9answers
489 views

Studies on code documentation productivity gains/losses

After much searching, I have failed to answer a basic question pertaining to an assumed known in the software development world: WHAT IS KNOWN: Enforcing a strict policy on adequate code ...
9
votes
7answers
3k views

What is idiomatic?

I understand an "idiom" to be a common operation or pattern that in a particular language is not simplified by core language syntax, such as integer increment: i = i + 1; In C++, this idiom is ...
8
votes
3answers
6k views

Injecting dependencies (DI) in c++ applications

I am playing with dependency injection, but i am not sure I am doing it right. Especially, I am not sure what should be the correct way to build classes with injected dependencies. Say I have a class ...
7
votes
2answers
5k views

How big a problem is Qt's cross-platform GUI? [closed]

I read something on this site saying that Qt's GUI being a big problem that stop programmers from using Qt. They say the problem is that the GUI don't look native, and they are inconsistent. I ...
6
votes
3answers
4k views

Should I use friend classes in C++ to allow access to hidden members?

Here is my situation (a simple example). Say I have a class called HiddenData Then I have another class called StoreHiddenData And finaly a class called OperateHiddenData Here's the thing, my ...
3
votes
9answers
2k views

C vs C++ for a Java (and possibly python) Programmer [closed]

I am a Hobbyist Java programmer and I would like to further my programming skills by learning C or C++ and Python. I have read many C vs C++ articles but none of them contain the information I'm ...
17
votes
13answers
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Is it an appropriate use of #define to make typing repeated code easier?

Is there any view on whether using the #define to define full lines of code for simplifying coding is good or bad programming practice? For example, if I needed to print a bunch of words together, I'd ...
14
votes
9answers
2k views

Isn't class scope purely for organization? [duplicate]

Isn't scope just a way to organize classes, preventing outside code from accessing certain things you don't want accessed? More specifically, is there any functional gain to having public, protected, ...
8
votes
4answers
1k views

Where does Objective-C come from? C++ or C?

I am very confused about this programming language, Objective-C, which I heard is used to develop iOS applications. I know that it uses the principles of OOP. Would it be easier to learn if I already ...
7
votes
1answer
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Observer pattern; knowing *what* changed?

I've created two abstract classes Subject and Observer that define a classic Observer pattern interface. I derive from them to implement the Observer pattern. An observer might look like this: void ...
7
votes
6answers
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How does const storage work? (Item 2, Scott Myers Effective C++)

In Item2 on page 16, (Prefer consts, enums, and inlines to #defines), Scott says: Also, though good compilers won't set aside storage for const objects of integer types... I don't understand ...
7
votes
7answers
2k views

Ensuring that headers are explicitly included in CPP file

I think it's generally good practice to #include the header for any types used in a CPP file, regardless of what is already included via the HPP file. So I might #include <string> in both my HPP ...
7
votes
9answers
2k views

Is it any good to use binary arithmetic in a C++ code like “C style”?

I like the fact that the C language lets you use binary arithmetic in an explicit way in your code, sometimes the use of the binary arithmetic can also give you a little edge in terms of performance; ...
6
votes
1answer
361 views

Difference between language virtual machine and emulating vm?

I'm having a hard time understanding the difference between an emulation virtual machine and a language vm. I started with the research and implementation of an emulation virtual machine. Primarily ...
6
votes
6answers
1k views

In C++, is it a reflection of poor software design if objects are deleted manually?

With the advent of smart pointers, is it a sign of poor design if I see objects are deleted? I'm seeing some software components in our product that people are still doing this. This practice strikes ...
6
votes
3answers
1k views

Checking preconditions or not

I've been wanting to find a solid answer to the question of whether or not to have runtime checks to validate input for the purposes of ensuring a client has stuck to their end of the agreement in ...
5
votes
6answers
3k views

C++: calling non-member functions with the same syntax of member ones

One thing I'd like to do in C++ is to call non-member functions with the same syntax you call member functions: class A { }; void f( A & this ) { /* ... */ } // ... A a; a.f(); // this is the ...
4
votes
2answers
589 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). ...
4
votes
3answers
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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 ...
4
votes
3answers
3k views

Specific reasons to create own array class over using std::array?

What specific conditions or requirements should you create your own array over using std::array? Here is my background: I'm developing a small simple library that a small group of people will use ...
3
votes
3answers
231 views

Is this a good method to create class hierarchies?

Is it a good design to store the type of the object in the base class as an enum? For example, consider the following hierarchy Expr --Unary --Binary --Const ----Int ----Float How to represent the ...
2
votes
4answers
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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 ...
2
votes
3answers
380 views

To store data or not?

I'd like to ask you about one simple thing. I have class A that do something (for example counts something ). There is also one class B that handle some parameters to this class (class A is member of ...
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vote
2answers
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C++ raw pointers for storage

I'm seeing a lot of people say you should never use raw pointers. What about in the case where you store the raw pointer in a class but how they get populated is from getting the pointer of an object ...
16
votes
6answers
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How to best protect from 0 passed to std::string parameters?

I have just realized something disturbing. Every time I have written a method that accepts a std::string as a paramater, I have opened up myself to undefined behaviour. For example, this... void ...
15
votes
10answers
2k views

What is the best aproach for coding in a slow compilation environment

I used to coding in C# in a TDD style - write/or change a small chunk of code, re-compile in 10 seconds the whole solution, re-run the tests and again. Easy... That development methodology worked ...
12
votes
9answers
1k views

Avoiding Object Oriented Pitfalls, Migrating from C, What Worked for You?

I've been programming in procedural languages for quite some time now, and my first reaction to a problem is to start breaking it down into tasks to perform rather than to consider the different ...