Add the following library to the linker input files:

    legacy_stdio_definitions.lib

VS 2015 now uses inline definitions that call internal functions for many of the `stdio.h` functions.  If an object file (or library member) depends on one of those functions, then the `legacy_stdio_definitions.lib` provides an externally linkable version of the function that can be linked to.

Your other option is to recompile the unit that depends on those functions with VS 2015 (this is probably the preferred option).



I got this error compiling cycling max plugins against version 5 max sdk (pure c api). The legacy library fix didn&#39;t work for me (it should have, and if anyone had any idea why it mightn&#39;t I&#39;d be curious), but I defined _NO_CRT_STDIO_INLINE before stdio was loaded and that did do the trick.

I recently encountered this and was able to add `User32.lib` to Linker &gt; Input &gt; Additional Dependencies.

You could also include `#pragma comment (lib, &quot;User32.lib&quot;)` in your code.

I want to know how to put the `/**/` comments through shortcut. I know the &lt;kbd&gt;Ctrl+K+C&lt;/kbd&gt; shortcut for the `//` comments but it comments the whole line. Sometimes while debugging, I want to do something like &quot;`ref string /* char[] */ lengthValue`&quot; while trying something out.

I want to be able to comment a specific part of a line (not the whole line) through a shortcut e.g in &quot;`string /* char[] */ lengthValue`&quot; i-e comment out only a specific part of a like by shortcut

I am using Visual Studio 2013

Please help

Visual Studio /**/ comment shortcut?

I found this problem in a GitHub front-end interview questions collection:

&gt;     var foo = {n: 1};
&gt;     var bar = foo;
&gt;     foo.x = foo = {n: 2};
&gt;
&gt;Question: What is the value of foo.x?

The answer is `undefined`.

I&#39;ve done some research and what I understand this problem is (correct me if I&#39;m wrong): 

* `var foo = {n: 1};` declares an object `foo` which has property `n` equal to 1.
* `var bar = foo;` declares an object `bar` which refers to the same object as `foo`.
* `foo.x = foo = {n: 2};` which I believe is equal to `foo.x = (foo = {n: 2});`
* And then I got `foo.x` equals to `undefined`. However, the value of `bar.x` is the object `{n:2}`.

If `bar` and `foo` refer to same object, why did `bar.x` get a value while `foo.x` is `undefined`? What is really happening in `foo.x = foo = {n: 2};`?

JavaScript code trick: What&#39;s the value of foo.x

For a research project, I&#39;m writing a C++ add-on to a scientific computing language. Unfortunately the library that allows users to do this is not kept very well up-to-date.

I started the project in XCode, where it built fine. Later I had to move to a PC, so I migrated the code to Visual Studio 2015. Since doing this, I haven&#39;t been able to build due to the following errors:

    LNK2001 : unresolved external symbol _sprintf
    LNK2019 : unresolved external symbol _sscanf referenced in function _GetDDouble
    LNK2019 : unresolved external symbol _sprintf referenced in function _CheckRunningInMainThread

An attempted fix was to add the header `#define _CRT_SECURE_NO_WARNINGS`. However, this a) fixed no errors and b) added the warning `C4005 : &#39;_CRT_SECURE_NO_WARNINGS&#39;: macro redefinition`. I assume the library already defined this macro, anticipating this problem. Regardless, it didn&#39;t solve the problem.

How should I proceed?



C++: Unresolved external symbol _sprintf and _sscanf in Visual Studio 2015

For a research project, I'm writing a C++ add-on to a scientific computing language. Unfortunately the library that allows users to do this is not kept very well up-to-date.
I started the project in XCode, where it built fine. Later I had to move to a PC, so I migrated the code to Visual Studio 2015. Since doing this, I haven't been able to build due to the following errors:
<pre><code class="hljs language-sql">LNK2001 : unresolved external symbol _sprintf
LNK2019 : unresolved external symbol _sscanf referenced in function _GetDDouble
LNK2019 : unresolved external symbol _sprintf referenced in function _CheckRunningInMainThread
</code></pre>
An attempted fix was to add the header <code>#define _CRT_SECURE_NO_WARNINGS</code>. However, this a) fixed no errors and b) added the warning <code>C4005 : '_CRT_SECURE_NO_WARNINGS': macro redefinition</code>. I assume the library already defined this macro, anticipating this problem. Regardless, it didn't solve the problem.
How should I proceed?

I would like to create a custom widget in Qt with the following features:

 - It is a container
 - It may be populated with any Qt layout
 - It may be inside any Qt layout
 - A button allows to collapse/fold vertically the content, so only the button is visible, all the contained layout is invisible.
 - The previous button allows to expand/unfold it again to the size of the layout content.
 - The expanding/collapsing is based on sizes (not on show/hide) to allows animation.
 - Usable in QDesigner

To provide an idea, here is an image of a similar widget (not Qt):
[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/KsVwP.png

I already have a frame that work correctly and is exposed in QDesigner. I need now to make it to extend/collapse, which does not seem so simple.

I tried to play with resize(), sizePolicy(), sizeHint() but that does not work:
When the frame is collapsed I got following values:

    sizeHint: (500,20)
    size    : (500,20)
    closestAcceptableSize: (518,150)
    Painted size: (518, 150)

QLayout::closestAcceptableSize is not part of the widget so I cannot change it.

**Any hint or/and code snippet to achieve that?**

EDITED:
Here a simple example. I removed all except necessary. 

main.cpp example

    #include &lt;QWidget&gt;
    #include &lt;QPushButton&gt;
    #include &lt;QVBoxLayout&gt;
    
    #include &quot;section.hpp&quot;
    
    
    using namespace myWidgets;
    int main(int argc, char *argv[])
    {
    	QApplication a(argc, argv);
    
    
    	// Create the main Window
    	QWidget window;
    	window.resize(500,500);
    	window.setStyleSheet(&quot;QPushButton:{background-color:rgba(128,128,128,192);}&quot;);
    
    	// Create the main window layout
    	QVBoxLayout topLayout(&amp;window);
    	QWidget *w1 = new QWidget();
    	w1-&gt;setStyleSheet(&quot;background-color:rgba(128,128,128,192);&quot;);
    	topLayout.addWidget(w1);
    
    	Section section(&amp;window);
    	topLayout.addWidget(&amp;section);
    
    	QVBoxLayout inLayout(&amp;section);
    	QPushButton *button = new QPushButton();
    	button-&gt;setMinimumHeight(100);
    	inLayout.addWidget(button);
    
    	QWidget *w2 = new QWidget();
    	w2-&gt;setStyleSheet(&quot;background-color:rgba(128,128,128,192);&quot;);
    	topLayout.addWidget(w2);
    
    
    
    	window.show();
    
    	return a.exec();
    }

Section.hpp

    #ifndef SECTION_HPP
    #define SECTION_HPP
    
    #include &lt;QPushButton&gt; //for the expand/collapse button
    #include &lt;QtDesigner/QDesignerExportWidget&gt;
    #include &lt;QLayout&gt;
    #include &lt;QPainter&gt;
    #include &lt;QPaintEvent&gt;
    #include &lt;QDebug&gt;
    
    
    // Compatibility for noexcept, not supported in vsc++
    #ifdef _MSC_VER
    #define noexcept throw()
    #endif
    
    #if defined SECTION_BUILD
    	#define SECTION_BUILD_DLL_SPEC Q_DECL_EXPORT
    #elif defined SECTION_EXEC
    	#define SECTION_BUILD_DLL_SPEC
    #else
    	#define SECTION_BUILD_DLL_SPEC Q_DECL_IMPORT
    #endif
    
    namespace myWidgets
    {
    
    class SECTION_BUILD_DLL_SPEC Section : public QWidget
    {
    	Q_OBJECT
    
    	Q_PROPERTY( bool is_expanded MEMBER isExpanded)
    
    public:
    	// Constructor, standard
    	explicit Section( QWidget *parent=0 ): QWidget(parent),
    		expandButton(this)
    	{
    		expandButton.resize(20,20);
    		expandButton.move(0,0);
    		expandButton.connect(&amp;expandButton, &amp;QPushButton::clicked,
    							 this, &amp;Section::expandCollapseEvent);
    
    		QMargins m= contentsMargins();
    		m.setTop(m.top()+25);
    		setContentsMargins(m);
    		//setSizePolicy(sizePolicy().horizontalPolicy(), QSizePolicy::Minimum);
    
    	}
    
    	virtual void expand( bool expanding ) noexcept
    	{
    		resize(sizeHint());
    		isExpanded = expanding;
    		updateGeometry();
    
    qDebug() &lt;&lt; (isExpanded? &quot;expanded&quot;:&quot;collapsed&quot;) &lt;&lt; sizeHint() &lt;&lt; QWidget::size() &lt;&lt;
    			parentWidget()-&gt;layout()-&gt;closestAcceptableSize(this, size());
    	}
    
    	virtual QSize sizeHint() const noexcept override
    	{
    		if (isExpanded) return QSize(layout()-&gt;contentsRect().width(),
    									 layout()-&gt;contentsRect().height());
    		else return QSize(layout()-&gt;contentsRect().width(), 20);
    	}
    
    	// Implement custom appearance
    	virtual void paintEvent(QPaintEvent *e) noexcept override
    	{
    		(void) e; //TODO: remove
    		QPainter p(this);
    		p.setClipRect(e-&gt;rect());
    		p.setRenderHint(QPainter::Antialiasing );
    		p.fillRect(e-&gt;rect(), QColor(0,0,255,128));
    	}
    
    protected:
    
    	// on click of the expandButton, collapse/expand this widget
    	virtual void expandCollapseEvent() noexcept
    	{
    		expand(!isExpanded);
    	}
    
    
    	bool isExpanded = true; //whenever the section is collapsed(false) or expanded(true)
    	QPushButton expandButton; //the expanding/collapsing button
    };
    
    }
    
    
    #endif // SECTION_HPP

How to make an expandable/collapsable section widget in Qt

I have the following code:

    #include &lt;iostream&gt;
    #include &lt;complex&gt;
    using namespace std;

    int main() {
	    complex&lt;int&gt; delta;
    	complex&lt;int&gt; mc[4] = {0};

    	for(int di = 0; di &lt; 4; di++, delta = mc[di]) {
            cout &lt;&lt; di &lt;&lt; endl;
        }

    	return 0;
    }


I expect it to output &quot;0, 1, 2, 3&quot; and stop, but it outputs an endless series of &quot;0, 1, 2, 3, 4, 5, .....&quot;

It looks like the comparison `di&lt;4` doesn&#39;t work well and always returns true.

If I just comment out `,delta=mc[di]`, I get &quot;0, 1, 2, 3&quot; as normal. What&#39;s the problem with the innocent assignment?

I am using [Ideone.com](http://ideone.com/) g++ C++14 with -O2 option.

C++ compilation bug?

I can see why the `auto` type in C++11 improves correctness and maintainability. I&#39;ve read that it can also improve performance ([Almost Always Auto][1] by Herb Sutter), but I miss a good explanation.

 - How can `auto` improve performance?
 - Can anyone give an example?

  [1]: http://herbsutter.com/2013/08/12/gotw-94-solution-aaa-style-almost-always-auto/


Can the use of C++11&#39;s &#39;auto&#39; improve performance?

Can all 4 languages be used in the same project at all, and if so how?

There are *similar* questions in the flavor: https://stackoverflow.com/questions/24042774/can-i-mix-swift-with-c-like-the-objective-c-mm-files to which the accepted answer is *no*.

Using `Bridging Header` adequately, `.h` that do not contain `C++` statements, `Objective-C` wrappers when `.h` do contain `C++`, `.mm` files to do the actual wrapping of `C++` classes, and `.swift`, can the 4 languages (5 if you include `Objective-C++`) build and link into a single executable?

----

[tag:objective-c++][tag:xcode]

Can I have Swift, Objective-C, C and C++ files in the same Xcode project?

During the installation of `Visual Studio 2015 Community` on `Windows 10` the following error occurred for me:

&gt; A Setup Package is either missing or damaged.


[![enter image description here][1]][1]


Since `vcredist_x86.exe` and `vcredist_x64.exe` files correspond to  [Visual C++ Redistributable Packages for Visual Studio 2013][2], I provided a location to   packages after downloading them (*third option* on the screenshot). After that the installation went smoothly.   



So the question:

are `Visual C++ Redistributable Packages for Visual Studio 2013` required for installing of `Visual Studio 2015`, is there any prerequisites for installing of Visual Studio 2015 on Windows 10, may be i&#39;m missing something obvious?   


  [1]: http://i.stack.imgur.com/8MfI7.png
  [2]: https://www.microsoft.com/en-us/download/details.aspx?id=40784

&quot;A Setup Package is either missing or damaged&quot; error while installing Visual Studio 2015 on Windows 10

When I create a new web project with Visual Studio, I only see the templates in the picture below:
[![missing MVC template][1]][1]


The MVC one is missing and so I can only create empty projects.

I tried with a repair of Visual Studio, but no luck.

Any suggestions?


  [1]: http://i.stack.imgur.com/HrLVZ.jpg

Missing MVC template in Visual Studio 2015

I&#39;m trying make a Visual Studio solution with CMake to compile the latest version of aseprite and CMake keeps giving me the:

    No CMAKE_C_COMPILER could be found.
    No CMAKE_CXX_COMPILER could be found.

I&#39;ve already downloaded GCC, and I&#39;m using [Visual&amp;nbsp;Studio&amp;nbsp;2015][1].

I&#39;m following this tutorial:

https://github.com/aseprite/aseprite/blob/master/INSTALL.md

  [1]: https://en.wikipedia.org/wiki/Microsoft_Visual_Studio#Visual_Studio_2015



CMake error at CMakeLists.txt:30 (project): No CMAKE_C_COMPILER could be found

### Problem

I don&#39;t understand how to make LocalDB show up in the SQL Server Object Explorer. On some VMs, it shows up automatically, on some other VMs, it doesn&#39;t. Still, after googling for hours, I don&#39;t get it.

### Current situation

1. I have a clean VM
1. I installed Visual Studio 2015 Community (all default settings)
1. I let a console application run (Entity Framework 6, code-first, console application) which worked on another VM and created a database automatically which then showed up in the SQL Server Object Explorer; but not this time

The error says:

    System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 52 - Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled.) ---&gt; System.ComponentModel.Win32Exception (0x80004005): The system cannot find the file specified

So, on this VM, no database gets created and nothing shows up in the SQL Server Object Explorer&#39;s `SQL Server` node.

[![Connecting to LocalDB][1]][1]


### What I think to know

- Visual Studio 2015 Community comes with LocalDB; so everything should just work out of the box, but it doesn&#39;t, and I don&#39;t know why
- LocalDB databases are just a pair of files (*.mdf and *.ldf)
- I&#39;ve seen the files being created at the default database location at `C:\Users\&lt;username&gt;\AppData\Local\Microsoft\Microsoft SQL Server Local DB\Instances\MSSQLLocalDB`; but on this VM, there is no such folder
- The `App.config` looked every time like this (and it was automatically created that way when I installed Entity Framework 6 the NuGet Package Manager in Visual Studio):

### App.config

    &lt;configuration&gt;
      &lt;configSections&gt;
        &lt;section name=&quot;entityFramework&quot; type=&quot;System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089&quot; requirePermission=&quot;false&quot; /&gt;
    &lt;/configSections&gt;
      &lt;entityFramework&gt;
        &lt;defaultConnectionFactory type=&quot;System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework&quot;&gt;
          &lt;parameters&gt;
            &lt;parameter value=&quot;mssqllocaldb&quot; /&gt;
          &lt;/parameters&gt;
        &lt;/defaultConnectionFactory&gt;
        &lt;providers&gt;
          &lt;provider invariantName=&quot;System.Data.SqlClient&quot; type=&quot;System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer&quot; /&gt;
        &lt;/providers&gt;
      &lt;/entityFramework&gt;
    &lt;/configuration&gt;

### Other random comments

- Earlier, with SQL Server, it was necessary to open up certain ports, but LocalDB runs, as I understand it, as a separate process on demand when started by Visual Studio.
- I don&#39;t know how to debug the `SQLException`
- Does LocalDB not come packaged with Visual Studio 2015 Community and do I need to install it separately?

  [1]: http://i.stack.imgur.com/NsZiq.png

How to add LocalDB to Visual Studio 2015 Community&#39;s SQL Server Object Explorer?

I just developed my first program in C++ and I wanted to show it with one of my friends. Sadly, when he tries to open the exe it gets an error which says &quot;MSVCP140.dll is missing&quot;. Why is this issue happening and how can he/I fix it?

Content Type	Original Author	Original Content on Stackoverflow
Question	NcAdams	View Question on Stackoverflow
Solution 1 - C++	Michael Burr	View Answer on Stackoverflow
Solution 2 - C++	David Karla	View Answer on Stackoverflow
Solution 3 - C++	TechNobo	View Answer on Stackoverflow

C++: Unresolved external symbol _sprintf and _sscanf in Visual Studio 2015

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Solution 2 - C++

Solution 3 - C++

JavaScript code trick: What's the value of foo.x

Visual Studio /**/ comment shortcut?

Attributions