Just dynamically link to Qt. If you dynamically link to LGPL libraries, there&#39;s nothing to worry about.

If you statically link to them, you can just distribute your object files (not your source code), and you&#39;ll be fine.

The idea of the LGPL is that the end user has to be able to replace the LGPL library with a version they want. Dynamically linking to the LGPL library lets you do that, as does statically linking and distributing your object files. So long as you do this, you can sell your closed source program all you want.

Of course, there&#39;s more to the LGPL than just this, but that&#39;s the relevant part.

Lets say I have three different MySQL tables:


**Table `products`:** 

    id | name
     1   Product A
     2   Product B



**Table `partners`:** 

    id | name
     1   Partner A
     2   Partner B

**Table `sales`:**

    partners_id | products_id
              1             2
              2             5
              1             5
              1             3
              1             4
              1             5
              2             2
              2             4
              2             3
              1             1

I would like to get a table with partners in the rows and products as columns. So far I was able to get an output like this:

    name      | name      | COUNT( * )
    Partner A   Product A          1
    Partner A   Product B          1
    Partner A   Product C          1
    Partner A   Product D          1
    Partner A   Product E          2
    Partner B   Product B          1
    Partner B   Product C          1
    Partner B   Product D          1
    Partner B   Product E          1
 
Using this query:

    SELECT partners.name, products.name, COUNT( * ) 
    FROM sales
    JOIN products ON sales.products_id = products.id
    JOIN partners ON sales.partners_id = partners.id
    GROUP BY sales.partners_id, sales.products_id
    LIMIT 0 , 30

but I would like to have instead something like:

    partner_name | Product A | Product B | Product C | Product D | Product E
    Partner A              1           1           1           1           2
    Partner B              0           1           1           1           1


The problem is that I cannot tell how many products I will have so the column number needs to change dynamically depending on the rows in the products table. 

This very good answer does not seem to work with mysql: https://stackoverflow.com/questions/2922797/t-sql-pivot-possibility-of-creating-table-columns-from-row-values

MySQL pivot row into dynamic number of columns

How do you fill a spinner from java code programmatically?

I have a spinner in the layout like this:

     &lt;Spinner
         android:id=&quot;@+id/consultation_deseases&quot;
         android:layout_width=&quot;@dimen/bigSpinnerWidth&quot;
         android:layout_height=&quot;@dimen/bigSpinnerHeight&quot;
         android:prompt=&quot;@string/disease_prompt&quot; /&gt;

With java code I need to create the adapter and add the items.


Android : Fill Spinner From Java Code Programmatically

I want to start a cross-platform project. I had my researches and now I am almost certain Qt is the right deal. There is a big obstacle here though: *licensing*.

I want to sell my project and I also don&#39;t want to give out any source related to my work or pay for a license. I checked and noticed Qt offers both commercial and open source solutions. I have heard too many conflicting sayings on Qt licensing which confused me a lot. Some say that even if I use LGPL version of Qt, I still need to submit my code. Is this true?

Can someone give me a simple explanation on Qt licenses and tell me if I can sell my application without any kind of restrictions at all or not? Would anyone tell me any other equivalents to Qt for cross-platform development without any restrictions?


Can I use Qt LGPL license and sell my application without any kind of restrictions?

I want to start a cross-platform project. I had my researches and now I am almost certain Qt is the right deal. There is a big obstacle here though: licensing.
I want to sell my project and I also don't want to give out any source related to my work or pay for a license. I checked and noticed Qt offers both commercial and open source solutions. I have heard too many conflicting sayings on Qt licensing which confused me a lot. Some say that even if I use LGPL version of Qt, I still need to submit my code. Is this true?
Can someone give me a simple explanation on Qt licenses and tell me if I can sell my application without any kind of restrictions at all or not? Would anyone tell me any other equivalents to Qt for cross-platform development without any restrictions?

I wonder why `cbegin` and `cend` were introduced in C++11? 

What are cases when calling these methods makes a difference from const overloads of `begin` and `end`?


What is the reason behind cbegin/cend?

I do not understand the difference between these two statements in my C++ class:

    class MyClass {
      public:
      private:
         static const int var = 0;            // Option 1
         const static int var = 0;            // Option 2
    };

What is the difference b/w Option 1 and Option 2?? They both compile. 


static const vs. const static

I am trying to print a Russian &quot;ф&quot; ([U+0444](http://www.unicode.org/charts/PDF/U0400.pdf) CYRILLIC SMALL LETTER EF) character, which is given a code of decimal [1092][1]. Using C++, how can I print out this character? I would have thought something along the lines of the following would work, yet...

    int main (){
       wchar_t f = &#39;1060&#39;;
       cout &lt;&lt; f &lt;&lt; endl;
    }

  [1]: http://en.wikipedia.org/wiki/%D0%A4

How to print Unicode character in C++?

I&#39;m looking at starting a new project in C++ - just in my own time initially - and I&#39;m investigating the build systems that are available. It would appear that the answer is &quot;Many, and they&#39;re all awful&quot;. 

The features that I specifically need for this are:

1. C++11 support
2. Cross platform (Linux as main target, but able to build on at least Windows as well)
3. Decent unit testing support
4. Support for multiple modules for separating code out
5. Support for code generation (Using asn1c or protobuf - not 100% sure yet)
6. Easy to maintain

Now, I know I can do 1-4 of those using CMake and Autotools easily enough. Probably also with SCons and Waf and the couple of others too. The problem is that I&#39;ve never worked out how to correctly do code generation using them - that is source files that do not exist until the build process is first run, so source files that the build system must be able to convert into executable code but doesn&#39;t actually know about until the build starts... (ASN1C in particular generates dozens of header and source files that must be able to work together, and the actual set of files generates depends on the contents of your asn file) There&#39;s also the fact that none of these are especially easy to maintain - CMake and Autotools have their own huge set of scripts that you need to manage for them to work, and Waf and Scons require that anybody working with them has decent knowledge of python (I don&#39;t) to work with them...

So - what build systems are recommended for something like this? Or will I be stuck with make files and shell scripts for now?

C++ Build Systems - What to use?

According to [C++ primer][1], `&lt;cstdlib&gt;` header defines `NULL`. [cpluspplus][2] says it is defined in `&lt;cstddef&gt;`.

Ultimately, if the right header is not included, I thought `NULL` can&#39;t be referenced. 

From what i can see, however it can be referenced and produce programs and that compile and run without warnings or errors, after including only `&lt;iostream&gt;`

Please help me understand this.


  [1]: http://www.amazon.com/Primer-5th-Edition-Stanley-Lippman/dp/0321714113
  [2]: http://www.cplusplus.com/reference/clibrary/cstddef/NULL/

What header defines NULL in C++?

For example, we have a `QLabel` with MaximumWidth set to 400.&lt;br&gt;
When we try to display some text with pixel width more than 400, it&#39;s shown cut off.&lt;br&gt;
Is there any way to make QLabel display this string in multiple lines without using QFontMetrics or the like?

QLabel auto multiple lines

How do I show a message box with Yes/No buttons in Qt, and how do I check which of them was pressed?

I.e. a message box that looks like this:

![enter image description here][1]

  [1]: http://i.stack.imgur.com/h92PA.png

Yes/No message box using QMessageBox

I have a `QLineEdit` where the user should input only numbers. 

So is there a numbers-only setting for `QLineEdit`?

Set QLineEdit to accept only numbers

I&#39;m having issues with `QByteArray` and `QString`.

I&#39;m reading a file and stores its information in a `QByteArray`. The file is in unicode, so it contains something like: `t\0 e\0 s\0 t\0 \0 \0`

I&#39;m trying to compare this value to my specified value, but it fails, because in the debugger I see it&#39;s not an unicode string.

The code will explain everything:

    QByteArray Data; //contains unicode string &quot;t\0 e\0 s\0 t\0 \0 \0&quot;
    QString myValue = &quot;test&quot;; //value to compare.
    if(Data.contains(myValue))
        //do some stuff.
    else
        //do other stuff.

In the debugger, it shows me that the variable `Data` has the value `&quot;t\0 e\0 s\0 t\0 \0 \0&quot;` and `myValue` has the value `&quot;test&quot;`. How can I fix it?

QByteArray to QString

I wanted to migrate my Qt 4 app to use Qt 5 instead. [These instructions][1] failed, due to some differences with how [MXE][2] builds Qt 5, including the fact that it uses modularised Qt tarballs, instead of one large tarball.


  [1]: https://stackoverflow.com/a/13211922/
  [2]: http://mxe.cc

Building Qt 5 on Linux, for Windows

I have created a simple list `API` in `C` and I want to release it via `Github`.

Is there any way to change the license after the creation of the repository?

How to change the license for a project at Github?

When I created a GitHub project I chose None.

How can I now add a GPL license to my already added project?

[![screenshot][1]][1]

  [1]: http://i.stack.imgur.com/BCJoL.png

How to add license to an existing GitHub project

I have a small node.js project that is company-internal and will not be released publicly or shared with third parties.  It certainly will not be contributed to any public package repositories.

But when I run `npm install` I always get the following error:

    npm WARN package.json &lt;&lt;myproject&gt;&gt;@0.1.0 license should be a valid SPDX license expression

The desired license is: &quot;copyright by us and all rights reserved&quot;.  I could not find anything that looked applicable in the [SPDX license list][1].  The suggestion in [this answer][2] does not work either.  If I simply remove the `license` field from `package.json` the error changes to `no license field`.

How do I get `npm install` to show no errors or warnings without putting a license reference in there that we do not want to use?


  [1]: https://spdx.org/licenses/
  [2]: https://stackoverflow.com/a/30986100/729627

I&#39;m getting the following error when trying to install an android platform on a Cordova project. I&#39;ve been following this guide: https://cordova.apache.org/docs/en/latest/guide/cli/

Error occurs when executing the following: $ cordova platform add android --save

&gt; A problem occurred configuring root project &#39;android&#39;.
&gt; You have not accepted the license agreements of the following SDK components:   [Android SDK Platform 24].

I&#39;ve searched all over for ways to **accept the license agreement of Android SDK Platform 24**, but no real luck. 

Thank you ahead of time.

Content Type	Original Author	Original Content on Stackoverflow
Question	Hossein	View Question on Stackoverflow
Solution 1 - C++	Cornstalks	View Answer on Stackoverflow

Can I use Qt LGPL license and sell my application without any kind of restrictions?

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Android : Fill Spinner From Java Code Programmatically

MySQL pivot row into dynamic number of columns

Attributions