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Fastest way to determine if an integer's square root is an integer
...04040 computed below
{
for (int i=0; i<64; ++i) goodMask |= Long.MIN_VALUE >>> (i*i);
}
public boolean isSquare(long x) {
// This tests if the 6 least significant bits are right.
// Moving the to be tested bit to the highest position saves us masking.
if (goodMask <&l...
How to write log to file
...the past, but this works for me:
f, err := os.OpenFile("testlogfile", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.Open() can't work f...
Is there a way to delete a line in Visual Studio without cutting it?
...
@nathan_hc, that actually performs a cut, which pollutes the clipboard. (Try it yourself and paste after using CTRL-L)
– Kirk Woll
Sep 17 '10 at 2:39
...
Coding in Other (Spoken) Languages
...nce I don't speak a word of that language, stuff could have been called var_123, var_562 or func_333 as well (and probably it would have been easier for me to remember the names or at least to have a chance of spelling them right without copying and pasting). Since this was a short, self-contained s...
SHA-1 fingerprint of keystore certificate
...-keypass android
for Release mode:
keytool -list -v -keystore {keystore_name} -alias {alias_name}
example:
keytool -list -v -keystore C:\Users\MG\Desktop\test.jks -alias test
On windows, when keytool command is not found, Go to your installed JDK Directory e.g. <YourJDKPath>\Java\j...
How to find the type of an object in Go?
...that you can get rid of variable t, so t := v.(type) becomes v.(type), and _ = t is no longer needed.
– Akavall
Feb 28 '17 at 6:21
...
How to “grep” for a filename instead of the contents of a file?
...
@alpha_989, I said grep supports it, which it does: gnu.org/software/grep/manual/html_node/… point is piping to grep is only needed if you need pcre. whereswalden has the right answer
– Dan
...
How to set focus on input field?
...on($timeout) {
return {
restrict: 'AC',
link: function(_scope, _element) {
$timeout(function(){
_element[0].focus();
}, 0);
}
};
});
usage is
<input name="theInput" auto-focus>
We use the timeout to let things in the...
Can a C# class inherit attributes from its interface?
...donly ConcurrentDictionary<MemberInfo, IReadOnlyCollection<T>> _cache =
// new ConcurrentDictionary<MemberInfo, IReadOnlyCollection<T>>();
//
// public static IReadOnlyCollection<T> Get(MemberInfo member)
// {
// return _cache.GetOrAdd(member, GetImp...
How do you use variables in a simple PostgreSQL script?
...e (http://www.postgresql.org/docs/9.1/static/sql-do.html )
DO $$
DECLARE v_List TEXT;
BEGIN
v_List := 'foobar' ;
SELECT *
FROM dbo.PubLists
WHERE Name = v_List;
-- ...
END $$;
Also you can get the last insert id:
DO $$
DECLARE lastid bigint;
BEGIN
INSERT INTO test (name) VALUES ('...