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What are all the uses of an underscore in Scala?
...st(1, 2, 3) map (_ + 2)
Method values
List(1, 2, 3) foreach println _
Converting call-by-name parameters to functions
def toFunction(callByName: => Int): () => Int = callByName _
Default initializer
var x: String = _ // unloved syntax may be eliminated
There may be others I have f...
Copy constructor for a class with unique_ptr
... unique_ptr can not be shared, you need to either deep-copy its content or convert the unique_ptr to a shared_ptr.
class A
{
std::unique_ptr< int > up_;
public:
A( int i ) : up_( new int( i ) ) {}
A( const A& a ) : up_( new int( *a.up_ ) ) {}
};
int main()
{
A a( 42 );
A ...
Print a string as hex bytes?
...s hex doesn't really make sense; you'll want to print bytes object as hex (convert str to bytes by calling .encode()).
– mic_e
May 8 '15 at 12:53
...
numpy: most efficient frequency counts for unique values in an array
...
@YohanObadia - depending on the size f the array, first converting it to a series has made the final operation faster for me. I would guess at the mark of around 50,000 values.
– n1k31t4
Oct 30 '18 at 11:50
...
android get real path by Uri.getPath()
...
Sorry and If I want to convert this image to file , without getting the real path how to do it ?
– Chlebta
Nov 24 '14 at 10:44
9...
Shell command to sum integers, one per line?
...Paste typically merges lines of multiple files, but it can also be used to convert individual lines of a file into a single line. The delimiter flag allows you to pass a x+x type equation to bc.
paste -s -d+ infile | bc
Alternatively, when piping from stdin,
<commands> | paste -s -d+ - | ...
How do I translate an ISO 8601 datetime string into a Python datetime object? [duplicate]
...453-0400 or 2008-09-03T20:56:35.450686+05:00 use the following. These will convert all variations into something without variable delimiters like 20080903T205635.450686+0500 making it more consistent/easier to parse.
import re
# This regex removes all colons and all
# dashes EXCEPT for the dash ind...
What is the Scala identifier “implicitly”?
...ontain a member selection that is applicable to args (even after trying to convert args with Implicit Views). In this case, the compiler looks for implicit members, locally defined in the current or enclosing scopes, inherited, or imported, that are either Functions from the type of that the.prefix ...
Generate an integer that is not among four billion given ones
...lize hardware-supported vector instructions. I think gcc can automatically convert code to using vector operations in some cases though.
– Brian Gordon
Aug 23 '11 at 15:57
3
...
Why does int num = Integer.getInteger(“123”) throw NullPointerException?
... is not the name of any system property, as discussed here.
If you want to convert this String to int, then use the method as
int num = Integer.parseInt("123").
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