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Negative weights using Dijkstra's Algorithm
... thus fails to accurately compute distances in some cases. Moreover, even if you were to store back pointers saying how to get from each node to the start node A, you'd end taking the wrong path back from C to A.
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Can you resolve an angularjs promise before you return it?
...ways be a promise so always declare it.
var deferred = $q.defer();
if (Cache[id]) {
// Resolve the deferred $q object before returning the promise
deferred.resolve(Cache[id]);
return deferred.promise;
}
// else- not in cache
$http.get('/someUrl', {id:id...
How Python web frameworks, WSGI and CGI fit together
... every request, and subprocess must exit or close stdout and stderr to signify end of response.
WSGI is an interface that is based on the CGI design pattern. It is not necessarily CGI -- it does not have to fork a subprocess for each request. It can be CGI, but it doesn't have to be.
WSGI adds t...
How is std::function implemented?
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The implementation of std::function can differ from one implementation to another, but the core idea is that it uses type-erasure. While there are multiple ways of doing it, you can imagine a trivial (not optimal) solution could be like this (simplified for the spec...
Get login username in java
...inst Java's philosophy of write once, run anywhere (introduction of OS specific code), and secondly, it creates a dependency on Sun's implementation of Java.
– Jin Kim
May 19 '09 at 16:28
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Gets byte array from a ByteBuffer in java
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Depends what you want to do.
If what you want is to retrieve the bytes that are remaining (between position and limit), then what you have will work. You could also just do:
ByteBuffer bb =..
byte[] b = new byte[bb.remaining()];
bb.get(b);
which is equ...
How do I implement IEnumerable
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If you choose to use a generic collection, such as List<MyObject> instead of ArrayList, you'll find that the List<MyObject> will provide both generic and non-generic enumerators that you can use.
using System.Col...
Most efficient way to cast List to List
... List<SubClass> will expect every item in the list to be a SubClass. If another part of code referred to the list as a List<BaseClass>, the compiler will not complain when a BaseClass or AnotherSubClass is inserted. But this will cause a ClassCastException for the first piece of code, wh...
Add a default value to a column through a migration
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If you need reversible migrations, put this in an up block rather than a change block. You can leave the down block empty. It won't revert the table to the original condition but the migration can be rolled back.
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Trim last character from a string
... definition removing only last character from string is bad solution.
So if we want to "Trim last character from string" we should do something like this
Example as extension method:
public static class MyExtensions
{
public static string TrimLastCharacter(this String str)
{
if(String....