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Why can't I initialize non-const static member or static array in class?
...tatic data members in class?
The C++ standard allows only static constant integral or enumeration types to be initialized inside the class. This is the reason a is allowed to be initialized while others are not.
Reference:
C++03 9.4.2 Static data members
§4
If a static data member is of const...
Escaping ampersand in URL
... must be percent-encoded. Percent-encoding
a reserved character involves converting the character to its
corresponding byte value in ASCII and then representing that value as
a pair of hexadecimal digits. The digits, preceded by a percent sign
("%") which is used as an escape character, are ...
Difference between pre-increment and post-increment in a loop?
...d 1 to a, returns the new value.
C#:
string[] items = {"a","b","c","d"};
int i = 0;
foreach (string item in items)
{
Console.WriteLine(++i);
}
Console.WriteLine("");
i = 0;
foreach (string item in items)
{
Console.WriteLine(i++);
}
Output:
1
2
3
4
0
1
2
3
foreach and while loops dep...
Difference between ref and out parameters in .NET [duplicate]
...tialized but passing it as a ref parameter it has to be set to something.
int x;
Foo(out x); // OK
int y;
Foo(ref y); // Error: y should be initialized before calling the method
Ref parameters are for data that might be modified, out parameters are for data that's an additional output for the fu...
C# Thread safe fast(est) counter
...
This would be simpler:
return Interlocked.Increment(ref COUNTER);
MSDN Interlocked.Increment
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using lodash .groupBy. how to add your own keys for grouped output?
...rt groupBy from "lodash/fp/groupBy";
const map = require('lodash/fp/map').convert({ 'cap': false });
const result = flow(
groupBy('color'),
map((users, color) => ({color, users})),
tap(console.log)
)(input)
Where input is an array that you want to convert.
...
Haskell Type vs Data Constructor
... of type Colour. We could imagine spicing it up though!
data Colour = RGB Int Int Int
We still have just the type Colour, but RGB is not a value – it's a function taking three Ints and returning a value! RGB has the type
RGB :: Int -> Int -> Int -> Colour
RGB is a data constructor t...
What is the difference between named and positional parameters in Dart?
... parameter. Here is an example:
getHttpUrl(String server, String path, [int port=80]) {
// ...
}
In the above code, port is optional and has a default value of 80.
You can call getHttpUrl with or without the third parameter.
getHttpUrl('example.com', '/index.html', 8080); // port == 8080
ge...
How to create a date and time picker in Android? [closed]
...
There is nothing built into Android that offers this.
EDIT: Andriod now offers built-in pickers. Check @Oded answer
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How to develop a soft keyboard for Android? [closed]
...it's just a Service.
I've been developing an IME, so ask again if you run into an issue.
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