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Is there a simple, elegant way to define singletons? [duplicate]
...he Metaclass approach.
class Singleton(type):
def __init__(cls, name, bases, dict):
super(Singleton, cls).__init__(name, bases, dict)
cls.instance = None
def __call__(cls,*args,**kw):
if cls.instance is None:
cls.instance = super(Singleton, cls).__call_...
How to test if a string is basically an integer in quotes using Ruby
...ll do it the right way. That said, my solution above doesn't deal with non-base-10 integers. So here's the way to do with without resorting to exceptions:
class String
def integer?
[ # In descending order of likeliness:
/^[-+]?[1-9]([0-9]*)?$/, # decima...
How to style dt and dd so they are on the same line?
...ock;
min-width: 100px;
}
Update - 3rd Jan 2017: I have added flex-box based solution for the problem. Check that in the linked codepen & refine it as per needs. Thanks!
dl.inline-flex {
display: flex;
flex-flow: row;
flex-wrap: wrap;
width: 300px; /* set the container width*/
...
D Programming Language in the real world? [closed]
...f computer graphics. I and others have had papers published in our fields based on work done using D. I think it's definitely ready for use on small to medium sized research projects where performance matters. It's a nice fit for research work because often you're starting from scratch anyway, so...
What is LDAP used for?
... for static page viewing, you will probably need to interact with your database to validate the user ID and its digital signature for this login session. Obviously, the query to your database for user-validation will become your bottleneck. By using LDAP, you can easily offload the user validation a...
How to create relationships in MySQL
In class, we are all 'studying' databases, and everyone is using Access. Bored with this, I am trying to do what the rest of the class is doing, but with raw SQL commands with MySQL instead of using Access.
...
Is inject the same thing as reduce in ruby?
...
i like to separate them based on how it's used, obviously just for semantics. if its a proc (&:+), reduce, if it's a block, inject
– TheRealMrCrowley
Jan 8 '18 at 20:12
...
How to pass prepareForSegue: an object
...egueWithIdentifier:sender: method to activate the transition to a new view based on a selection or button press.
For instance, consider I had two view controllers. The first contains three buttons and the second needs to know which of those buttons has been pressed before the transition. You co...
ASP.NET Repeater bind List
...
A more complete example based on the LINQ provided by @RobertoBr:
In code behind:
List<string> notes = new List<string>();
notes.Add("Value1")
notes.Add("Value2")
repeaterControl1.DataSource = from c in notes select new {NAME = c};
re...
How do I clone a GitHub wiki?
...
Yes. You can set them to have read access based on whether they're a collaborator, but push permissions require them to be a collaborator. github.com/blog/774-git-powered-wikis-improved
– joseph.hainline
Nov 12 '13 at 20:27
...