That&#39;s just less than or equal.  I don&#39;t think C# lambdas work like that.  It&#39;s too early in the morning.  You need coffee.

That&#39;s not a lambda at all. That&#39;s *less than or equal to*

&lt;sub&gt;*[(Except when it&#39;s actually a reverse lambda)](https://gist.github.com/3251441)*&lt;/sub&gt;

It is only used as &#39;less than or equal to&#39; operation, as in:

```cs
if (i &lt;= 5) {
    // ...
}
```

The following code gives me a segmentation fault when run on a 2Gb machine, but works on a 4GB machine.


    int main()
    {
       int c[1000000];
       cout &lt;&lt; &quot;done\n&quot;;
       return 0;
    }

The size of the array is just 4Mb. Is there a limit on the size of an array that can be used in c++?



Segmentation fault on large array sizes

I have a library that I distribute using maven 2.  The typical user of this library doesn&#39;t use maven to build their applications, but is likely somewhat familiar with maven and probably has it installed.

I&#39;d like to document a &quot;simple&quot; one line command they can use to download my library&#39;s artifacts to their local `~/.m2/repository` without requiring that they set up a pom.xml to do it.

I thought there was a way to do this, but I can&#39;t seem to find it after looking through the `install:install-file` and `dependency` plugin documentation.  I tried things like:

    mvn install:install-file -DrepositoryId=java.net -Durl=http://download.java.net/maven/2/ -Dfile=robo-guice-0.4-20091121.174618-1.jar -DpomFile=robo-guice-0.4-20091121.174618-1.pom -DgroupId=robo-guice -DartifactId=robo-guice -Dversion=0.4-SNAPSHOT -Dpackaging=jar

but I think I&#39;m barking up the wrong tree since it appears that the install plugin is used to copy locally built files into the local repository, rather than download remote artifacts into the local repository.

This is the artifact I&#39;d like to install: [http://download.java.net/maven/2/robo-guice/robo-guice/0.4-SNAPSHOT/][1]

Is this possible using maven?


  [1]: http://download.java.net/maven/2/robo-guice/robo-guice/0.4-SNAPSHOT/


A simple command line to download a remote maven2 artifact to the local repository?

I have seen some code which uses the `&lt;=` operator. Can you explain what is the use of having lambda in reverse direction?

C# lambda expression reverse direction &lt;=

<p>I have seen some code which uses the <code>&#x3C;=</code> operator. Can you explain what is the use of having lambda in reverse direction?</p>


How to determine if object is of type IEnumerable &amp;lt;T&amp;gt;?

Code:

    namespace NS {
    	class Program {
    		static IEnumerable&lt;int&gt; GetInts() {
    			yield return 1;
    		}
    		static void Main() {
    			var i = GetInts();
    			var type = i.GetType();
    			Console.WriteLine(type.ToString());
    		}
    	}
    }

Output:

    NS.1.Program+&lt;GetInts&gt;d__0

If I change GetInts to return IList&lt;int&gt;, everything is OK 
the output is:

     System.Collections.Generic.List`1[System.Int32]

And this returns false:

    namespace NS {
    	class Program {
    		static IEnumerable&lt;int&gt; GetInts() {
    			yield return 1;
    		}
    		static void Main() {
    			var i = GetInts();
    			var type = i.GetType();
    			Console.WriteLine(type.Equals(typeof(IEnumerable&lt;int&gt;)));
    		}
    	}
    }



Determine if collection is of type IEnumerable&lt;T&gt;

I&#39;m not even sure how to do this without using some horrible for loop/counter type solution.  Here&#39;s the problem:

I&#39;m given two dates, a start date and an end date and on a specified interval I need to take some action. For example: for every date between 3/10/2009 on every third day until 3/26/2009 I need to create an entry in a List. So my inputs would be:

    DateTime StartDate = &quot;3/10/2009&quot;;
    DateTime EndDate = &quot;3/26/2009&quot;;
    int DayInterval = 3;

and my output would be a list that has the following dates:

3/13/2009
3/16/2009
3/19/2009
3/22/2009
3/25/2009

So how the heck would I do something like this? I thought about using a for loop that would iterate between every day in the range with a separate counter like so:

    int count = 0;
    
    for(int i = 0; i &lt; n; i++)
    {
         count++;
         if(count &gt;= DayInterval)
         {
              //take action
              count = 0;
         }
    
    }

But it seems like there could be a better way?


How do I loop through a date range?

In C# you can put a constraint on a generic method like:

    public class A {
        
        public static void Method&lt;T&gt; (T a) where T : new() {
            //...do something...
        }
        
    }

Where you specify that `T` should have a constructor that requires no parameters. I&#39;m wondering whether there is a way to add a constraint like &quot;*there exists a constructor with a `float[,]` parameter?*&quot;

The following code doesn&#39;t compile:

    public class A {
        
        public static void Method&lt;T&gt; (T a) where T : new(float[,] u) {
            //...do something...
        }
        
    }

A workaround is also useful?

Is there a generic constructor with parameter constraint in C#?

Is there any way to override a non-virtual method? or something that gives similar results (other than creating a new method to call the desired method)?

I would like to override a method from `Microsoft.Xna.Framework.Graphics.GraphicsDevice` with unit testing in mind.



Is it possible to override a non-virtual method?

 - Why can&#39;t I use a constraint of
   `where T : System.ValueType`?  
 - Why does Microsoft prevent this type
   from being a constraint?

----------

**Example:**

Why can&#39;t I do the following?

    // Defined in a .Net class
    public void bar&lt;T&gt;(T a) where T : ValueType {...}

    // Defined in my class
    public void foo&lt;T&gt;(T a) where T : ValueType 
    { bar&lt;T&gt;(a); }


What is the difference in using struct over ValueType?

    // Defined in my class
    public void foo&lt;T&gt;(T a) where T : struct 
    { bar&lt;T&gt;(a); }



Why can&#39;t I use System.ValueType as a generics constraint?

I have a collection of integer values in a List&lt;long&gt; collection.
I want to call a function for each value in the collection where one of the function&#39;s argument is a collection value. 
Without doing this in a foreach loop... is there a way to accomplish this with a lambda/linq expression?

something like... `myList.Where(p =&gt; myFunc(p.Value));` ?

thanks in advance,
-s

call a function for each value in a generic c# collection

The lambda anonymous function is part of PHP 5.3. What use does it have? Is there anything that one can only do with lambda? Is lambda better for certain tasks? 

I&#39;ve seen the Fibonacci example, and I really don&#39;t need to write Fibonacci sequences, so I&#39;m still not sure if it&#39;s that useful for the kinds of tasks I encounter in writing webbish applications. So what does one do with it in &quot;real life&quot;?

What use is lambda in PHP?

I have a foreach loop reading a list of objects of one type and producing a list of objects of a different type. I was told that a lambda expression can achieve the same result.

    var origList = List&lt;OrigType&gt;(); // assume populated
    var targetList = List&lt;TargetType&gt;(); 
    
    foreach(OrigType a in origList) {
        targetList.Add(new TargetType() {SomeValue = a.SomeValue});
    }

Any help would be appreciated- i&#39;m new to lambda and linq 
thanks,
s

convert a list of objects from one type to another using lambda expression

I have a question about which style is preferred: std::bind Vs lambda in C++0x. I know that they serve -somehow- different purposes but lets take an example of intersecting functionality.

Using `lambda`:

    uniform_int&lt;&gt; distribution(1, 6);
    mt19937 engine;
    // lambda style
    auto dice = [&amp;]() { return distribution(engine); };
Using `bind`:

    uniform_int&lt;&gt; distribution(1, 6);
    mt19937 engine;
    // bind style
    auto dice = bind(distribution, engine);

Which one should we prefer? why? assuming more complex situations compared to the mentioned example. i.e. What are the advantages/disadvantages of one over the other?

Bind Vs Lambda?

I am using Entity Framework in my C# based code.  I am running into an unexpected weirdness and am looking for suggestions.

Case 1, 2, 3, 4...
Projects:  
RivWorks.dll  
RivWorks.Service.dll  
RivWorks.Alpha.dll  

Samples (all of these work):&lt;br/&gt;
**RivWorks.Alpha.dll:**

    public static bool EndNegotitation(long ProductID)
    {
        var product = (from a in _dbFeed.AutoWithImage 
                       where a.AutoID == ProductID select a).FirstOrDefault();
    ...
    }

**RivWorks.Service.dll**

    public static RivWorks.Model.NegotiationAutos.AutoWithImage 
        GetProductById(long productId)
    {
        var myProduct = from a in _dbFeed.AutoWithImage 
                        where a.AutoID == productId select a;

        return myProduct.FirstOrDefault();
    }
    public static List&lt;RivWorks.Model.NegotiationAutos.AutoWithImage&gt; 
        GetProductByCompany(Guid companyId)
    {
        var myProduct = from a in _dbFeed.AutoWithImage 
                        where a.CompanyID == companyId select a;

        return myProduct.ToList();
    }

etc

Case &quot;weirdness&quot;:  
RivWorks.Web.Service.dll (WCF project)  
Contains the same references as the other projects.

    public NegotiateSetup GetSetup(string method, string jsonInput)
    {
        ...
        long.TryParse(ProductID, out result);
        var product = (from a in _dbFeed.AutoWithImage 
                       where a.AutoID == result select a).FirstOrDefault();
        ...
    }

I am getting this compile time error (the word &quot;where&quot; is highlighted in my editor):&lt;br/&gt;
*Cannot convert lambda expression to type &#39;string&#39; because it is not a delegate type*&lt;br/&gt;

Any ideas what would cause this?


Entity Framework - Cannot convert lambda expression to type &#39;string&#39; because it is not a delegate type

Can I define in C++ an array operator that takes multiple arguments? I tried it like this:

	const T&amp; operator[](const int i, const int j, const int k) const{ 
		return m_cells[k*m_resSqr+j*m_res+i];
	}

	T&amp; operator[](const int i, const int j, const int k){ 
		return m_cells[k*m_resSqr+j*m_res+i];		
	}

But I&#39;m getting this error:

    error C2804 binary operator &#39;[&#39; has too many parameters


C++ [] array operator with multiple arguments?

I am a C guy and I&#39;m trying to understand some C++ code. I have the following function declaration:

    int foo(const string &amp;myname) {
      cout &lt;&lt; &quot;called foo for: &quot; &lt;&lt; myname &lt;&lt; endl;
      return 0;
    }

How does the function signature differ from the equivalent C:

    int foo(const char *myname)

Is there a difference between using `string *myname` vs `string &amp;myname`? What is the difference between `&amp;` in C++ and `*` in C to indicate pointers?

Similarly:

    const string &amp;GetMethodName() { ... }

What is the `&amp;` doing here? Is there some website that explains how `&amp;` is used differently in C vs C++?

What does &#39;&amp;&#39; do in a C++ declaration?

What function does the `^` (caret) operator serve in Java?

When I try this:

    int a = 5^n;

...it gives me:
&gt; for n = 5, returns 0  
&gt; for n = 4, returns 1  
&gt; for n = 6, returns 3  

...so I guess it doesn&#39;t perform exponentiation. But what is it then?

What does the ^ operator do in Java?

What is the difference between `=`, `==`, and `===`?

I think using one equal sign is to declare a variable while two equal signs are for a comparison condition and lastly three equal signs are for comparing values of declared variables.


The 3 different equals

What&#39;s the difference between the `or` and `||` operators in Ruby? Or is it just preference?

Content Type	Original Author	Original Content on Stackoverflow
Question	user215675	View Question on Stackoverflow
Solution 1 - C#	Dave Markle	View Answer on Stackoverflow
Solution 2 - C#	David Hedlund	View Answer on Stackoverflow
Solution 3 - C#	Razzie	View Answer on Stackoverflow

C# lambda expression reverse direction <=

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

A simple command line to download a remote maven2 artifact to the local repository?

Segmentation fault on large array sizes

Attributions