What does your .h file *end* with?  I&#39;m guessing that the end of your class defnition does not have a &quot;;&quot;.  The class is being interpreted as the return type of the first function in your cpp file.

Losing `;` in the end of class declaration could lead to such error.

Is it possible to easily round a figure &lt;b&gt;up&lt;/b&gt; to the nearest 100 (or 1000, 500, 200 etc.) in SQL Server?

So:

720 -&gt; 800&lt;br/&gt;
790 -&gt; 800&lt;br/&gt;
1401 -&gt; 1500&lt;br/&gt;

Round *UP* to the nearest 100 in SQL Server

I have got a text string like this: 

    test1test

I want to check if it contains at least one digit using a regex.

What would this regex look like?

Regex: Check if string contains at least one digit

I am confused I think on C++ class structure.

I have a .h called FxMathFunctions.h and a .cpp called FxMathFunctions.cpp

the .h starts like:

    class  FxMathFunctions
    {
    	public:
    		FxMathFunctions();
    		~FxMathFunctions();


and in the .cpp

I have: 

    #include &quot;FxBasicTypes.h&quot;
    #include &quot;FxMathFunctions.h&quot;

    FxMathFunctions::FxMathFunctions() {}

    FxMathFunctions::~FxMathFunctions() {}

I am getting errors like:

    error: new types may not be defined in a return type
    error: return type specification for constructor invalid

This must be something to do with definition someplace, but I just dont see where this might occur.

new types may not be defined in a return type - C++

I am confused I think on C++ class structure.
I have a .h called FxMathFunctions.h and a .cpp called FxMathFunctions.cpp
the .h starts like:
<pre><code class="hljs language-scss">class FxMathFunctions
{
	public:
		FxMathFunctions();
		~FxMathFunctions();
</code></pre>
and in the .cpp
I have:
<pre><code class="hljs language-arduino">#include "FxBasicTypes.h"
#include "FxMathFunctions.h"

FxMathFunctions::FxMathFunctions() {}

FxMathFunctions::~FxMathFunctions() {}
</code></pre>
I am getting errors like:
<pre><code class="hljs language-go">error: new types may not be defined in a return type
error: return type specification for constructor invalid
</code></pre>
This must be something to do with definition someplace, but I just dont see where this might occur.

I&#39;ve just inherited some C++ code that was written poorly with one cpp file which contained the main and a bunch of other functions. There are also `.h` files that contain classes and their function definitions.

Until now the program was compiled using the command `g++ main.cpp`. Now that I&#39;ve separated the classes to `.h` and `.cpp` files do I need to use a makefile or can I still use the `g++ main.cpp` command?

Using G++ to compile multiple .cpp and .h files

I&#39;m trying to read an entire stream (multiple lines) into a string. 

I&#39;m using this code, and it works, but it&#39;s offending my sense of style... Surely there&#39;s an easier way? Maybe using stringstreams?


    void Obj::loadFromStream(std::istream &amp; stream)
    { 
      std::string s;
    
      std::streampos p = stream.tellg();  // remember where we are
    
      stream.seekg(0, std::ios_base::end); // go to the end
      std::streamoff sz = stream.tellg() - p;  // work out the size
      stream.seekg(p);        // restore the position
    
      s.resize(sz);          // resize the string
      stream.read(&amp;s[0], sz);  // and finally, read in the data.

&lt;hr&gt;
Actually, a `const` reference to a string would do as well, and that may make things easier...

    const std::string &amp;s(... a miracle occurs here...)



How to read entire stream into a std::string?

What is difference between  

    int x=7;

and 

    register int x=7;

?

I am using C++.


Register keyword in C++

Is there a `QString` function which takes an **int** and outputs it as a `QString`?

How to convert int to QString?

Why does C++ have `public` members that anyone can call and `friend` declarations that expose _all_ `private` members to _given_ foreign classes or methods but offer no syntax to expose particular members to given callers?

I want to express interfaces with some routines to be invoked only by known callers without having to give those callers complete access to all privates, which feels like a reasonable thing to want.  The best I could come up with myself (below) and suggestions by others so far revolve around idioms/pattern of varying indirectness, where I really just want a way to have _single_, simple class definitions that explicitly indicate what callers (more granularly than _me_, _my children_, or _absolutely anybody_) can access which members.  What is the best way to express the concept below?

    // Can I grant Y::usesX(...) selective X::restricted(...) access more cleanly?
    void Y::usesX(int n, X *x, int m) {
      X::AttorneyY::restricted(*x, n);
    }

    struct X {
      class AttorneyY;          // Proxies restricted state to part or all of Y.
    private:
      void restricted(int);     // Something preferably selectively available.
      friend class AttorneyY;   // Give trusted member class private access.
      int personal_;            // Truly private state ...
    };

    // Single abstract permission.  Can add more friends or forwards.
    class X::AttorneyY {
      friend void Y::usesX(int, X *, int);
      inline static void restricted(X &amp;x, int n) { x.restricted(n); }
    };

I&#39;m nowhere near being a software organization guru, but it feels like interface simplicity and the principle of least privilege are directly at odds in this aspect of the language.  A clearer example for my desire might be a `Person` class with declared methods like `takePill(Medicine *)` `tellTheTruth()` and `forfeitDollars(unsigned int)` that only `Physician`, `Judge`, or `TaxMan` instances/member methods, respectively, should even consider invoking.  Needing one-time proxy or interface classes for each major interface aspect sits ill with me, but please speak up if you know I&#39;m missing something.

__Answer accepted from [Drew Hall][1]: [Dr Dobbs - Friendship and the Attorney-Client Idiom][2]__

The code above originally called the wrapper class &#39;Proxy&#39; instead of &#39;Attorney&#39; and used pointers instead of references but was otherwise equivalent to what Drew found, which I then deemed the best generally known solution.  (Not to pat myself on the back too hard...)  I also changed the signature of &#39;restricted&#39; to demonstrate parameter forwarding.  The overall cost of this idiom is one class and one friend declaration per permission set, one friend declaration per set approved caller, and one forwarding wrapper per exposed method per permission set.  Most of the better discussion below revolves around the forwarding call boilerplate that a very similar &#39;Key&#39; idiom avoids at the expense of less direct protection.

  [1]: https://stackoverflow.com/users/23934/drew-hall
  [2]: http://www.drdobbs.com/184402053

clean C++ granular friend equivalent? (Answer: Attorney-Client Idiom)

If I create a class MyClass and it has some private member say MyOtherClass, is it better to make MyOtherClass a pointer or not?  What does it mean also to have it as not a pointer in terms of where it is stored in memory? Will the object be created when the class is created?

I noticed that the examples in QT usually declare class members as pointers when they are classes.

Class members that are objects - Pointers or not? C++

I&#39;ve had some really awesome help on my previous questions [for detecting paws][1] and [toes within a paw][2], but all these solutions only work for one measurement at a time.

[Now I have data][3] that consists off:

- about 30 dogs; 
- each has 24 measurements (divided into several subgroups); 
- each measurement has at least 4 contacts (one for each paw) and 
  - each contact is divided into 5 parts and 
  - has several parameters, like contact time, location, total force etc.

![alt text][4]

Obviously sticking everything into one big object isn&#39;t going to cut it, so I figured I needed to use classes instead of the current slew of functions. But even though I&#39;ve read Learning Python&#39;s chapter about classes, I fail to apply it to my own code ([GitHub link][5])

I also feel like it&#39;s rather strange to process all the data *every* time I want to get out some information. Once I know the locations of each paw, there&#39;s no reason for me to calculate this again. Furthermore, I want to compare all the paws of the same dog to determine which contact belongs to which paw (front/hind, left/right). This would become a mess if I continue using only functions.

So now I&#39;m looking for advice on how to create classes that will let me process my data ([link to the zipped data of one dog][6]) in a sensible fashion. 


  [1]: https://stackoverflow.com/questions/4087919
  [2]: https://stackoverflow.com/questions/3684484
  [3]: http://dl.dropbox.com/u/5207386/RAR-collectie.rar
  [4]: http://i.stack.imgur.com/8x2uG.png
  [5]: http://cloud.github.com/downloads/ivoflipse/DogsRus/pressureanalysis.py
  [6]: http://dl.dropbox.com/u/5207386/Krupp_Krulle.rar

How do I design a class in Python?

I&#39;d like to trace some code in GIMP and therefore need GIMP with debug symbols enabled. I don&#39;t remember whether I have enabled them during compilation. How to check that without recompiling the program?

How to check if program was compiled with debug symbols?

I wrote this in scala and it won&#39;t compile:

    class TestDoubleDef{
      def foo(p:List[String]) = {}
      def foo(p:List[Int]) = {}
    }

the compiler notify:

    [error] double definition:
    [error] method foo:(List[String])Unit and
    [error] method foo:(List[Int])Unit at line 120
    [error] have same type after erasure: (List)Unit

I know JVM has no native support for generics so I understand this error.

I could write wrappers for `List[String]` and `List[Int]` but I&#39;m lazy :)

I&#39;m doubtful but, is there another way expressing `List[String]` is not the same type than `List[Int]`?

Thanks.

Scala double definition (2 methods have the same type erasure)

How can I compile/install node.js on Ubuntu? It failed with an error about `cxx compiler`.



How to compile/install node.js(could not configure a cxx compiler!) (Ubuntu). 

This question is perhaps somehow odd, but how can I speed up g++ compile time? My C++ code heavily uses boost and templates. I already moved as much as possible out of the headers files and use the -j option, but still it takes quite a while to compile (and link).

Are there any tools out there which analyse my code and point out bottle-necks for the compiler? Or can one somehow profile the compiler running on my code? This would be really nice, because sometimes I have the impression, that I spent too much time staring at the compiler console log ...


Content Type	Original Author	Original Content on Stackoverflow
Question	jDOG	View Question on Stackoverflow
Solution 1 - C++	Chris Pitman	View Answer on Stackoverflow
Solution 2 - C++	Kirill V. Lyadvinsky	View Answer on Stackoverflow
Solution 3 - C++	tojas	View Answer on Stackoverflow

new types may not be defined in a return type - C++

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Solution 2 - C++

Solution 3 - C++

Regex: Check if string contains at least one digit

Round UP to the nearest 100 in SQL Server

Attributions