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What is the use of ObservableCollection in .net?
...ect sender, NotifyCollectionChangedEventArgs e)
{
foreach (var m>x m> in e.NewItems)
{
// do something
}
foreach (var y in e.OldItems)
{
//do something
}
if (e.Action == NotifyCollectionChangedAction.Move)
{
...
std::function vs template
...er it can get when memory allocation is involved, I've changed the lambda em>x m>pression to capture three floats. This makes the callable object too big to apply the small object optimization:
float a, b, c; // never mind the values
// ...
calc2([a,b,c](float arg){ return arg * 0.5f; });
For this ver...
For i = 0, why is (i += i++) equal to 0?
...ersimplification):
int i = 0;
i = i + i; // i=0 because the ++ is a postfim>x m> operator and hasn't been em>x m>ecuted
i + 1; // Note that you are discarding the calculation result
What actually happens is more involved than that - take a look at MSDN, 7.5.9 Postfim>x m> increment and decrement operators:
...
Version number comparison in Python
...
def mycmp(version1, version2):
def normalize(v):
return [int(m>x m>) for m>x m> in re.sub(r'(\.0+)*$','', v).split(".")]
return cmp(normalize(version1), normalize(version2))
This is the same approach as Pär Wieslander, but a bit more compact:
Here are some tests, thanks to "How to compar...
how to em>x m>clude null values in array_agg like in string_agg using postgres?
...s a null value, that null is also taken as a name in the aggregate. For em>x m>ample :
8 Answers
...
Error handling in C code
...ef'ed enum and use it in your lib. Don't just return ints or even worse, mim>x m> ints or different enumerations with return-codes.
provide a function that converts errors into something human readable. Can be simple. Just error-enum in, const char* out.
I know this idea makes multithreaded use a bit di...
node.js global variables?
...e? Is it a good pattern to follow? As in should I do this or should I use em>x m>press set? Thanks
– Harry
Mar 28 '11 at 3:34
4
...
How can I truncate a double to only two decimal places in Java?
For em>x m>ample I have the variable 3.545555555, which I would want to truncate to just 3.54.
15 Answers
...
How to em>x m>plicitly discard an out argument?
...hem.
public void PrintCoordinates(Point p)
{
p.GetCoordinates(out int m>x m>, out int y);
WriteLine($"({m>x m>}, {y})");
}
public void Printm>X m>Coordinate(Point p)
{
p.GetCoordinates(out int m>x m>, out _); // I only care about m>x m>
WriteLine($"{m>x m>}");
}
Source: https://blogs.msdn.microsoft.com/dotnet...
Properly removing an Integer from a List
...
Java always calls the method that best suits your argument. Auto bom>x m>ing and implicit upcasting is only performed if there's no method which can be called without casting / auto bom>x m>ing.
The List interface specifies two remove methods (please note the naming of the arguments):
remove(Object...