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Difference between this and self in self-type annotations?
...
All three forms are valid, and have the effect that B is assumed as the type of this in class A.
The first two variants
trait A { self: B => ... }
trait A { foo: B => ... }
introduce self (respectively, foo) as an alias for ...
Quick Way to Implement Dictionary in C
...t's the most convenient way to implement one in C? I am not looking for performance, but ease of coding it from scratch. I don't want it to be generic either -- something like string->int will do. But I do want it to be able to store an arbitrary number of items.
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How can I define a composite primary key in SQL?
... MemberID are not separate primary keys but rather the combination of them form a unique pair/tuple.
– Peter
Jul 10 '09 at 15:47
5
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Why is there no String.Empty in Java?
...ngs are immutable, it's not like you can first get an empty String, and perform some operations on it - best to use a StringBuilder (or StringBuffer if you want to be thread-safe) and turn that into a String.
Update
From your comment to the question:
What inspired this is actually
TextBox.set...
Inline instantiation of a constant List
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SVN encrypted password store
... most companies have subversion setup using their domain password or some form of SSO password. By encrypting the password, you would at least mask someone from accessing a users other accounts.
I would still be concerned about the encryption strength. If the subversion password is linked to oth...
Excluding directories in os.walk
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... an alternative form of @unutbu's excellent answer that reads a little more directly, given that the intent is to exclude directories, at the cost of O(n**2) vs O(n) time.
(Making a copy of the dirs list with list(dirs) is required for cor...
Virtual member call in a constructor
... in C#, that object exists in a fully initialized (just not "constructed") form, as its fully derived type.
namespace Demo
{
class A
{
public A()
{
System.Console.WriteLine("This is a {0},", this.GetType());
}
}
class B : A
{
}
// . . ....
How to change owner of PostgreSql database?
...db
old_name_db=# REASSIGN OWNED BY old_name TO new_name;
This must be performed on each DB owned by 'old_name'. The command will update ownership of all tables in the DB.
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Running a cron job at 2:30 AM everyday
...:
crontab -e
Add this command line:
30 2 * * * /your/command
Crontab Format:
MIN HOUR DOM MON DOW CMD
Format Meanings and Allowed Value:
MIN Minute field 0 to 59
HOUR Hour field 0 to 23
DOM Day of Month 1-31
MON Month field 1-12
DOW Day Of Week 0-6
CM...