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My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())
... has taught me is what is known as the "most vexing parse", which is classically demonstrated with a line such as
5 Answers...
How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searc
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We will look at how the contents of this array are constructed and can be manipulated to affect where the Perl interpreter will find the module files.
Default @INC
Perl interpreter is compiled with a specific @INC default value. To find out this value, run env -i perl -V command (env -i i...
When should I use jQuery deferred's “then” method and when should I use the “pipe” method?
jQuery's Deferred has two functions which can be used to implement asynchronous chaining of functions:
3 Answers
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Updating packages in Emacs
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In order to automatically update the list of packages, only if there is no package list already, use the following:
(when (not package-archive-contents)
(package-refresh-contents))
In order to update all installed packages, type package-l...
Clustered vs Non-Clustered
...ed vs. non-clustered index is that the clustered index determines the physical order of the rows in the database. In other words, applying the clustered index to PersonId means that the rows will be physically sorted by PersonId in the table, allowing an index search on this to go straight to the ro...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
Following on from this question , can someone explain the following in Scala:
4 Answers
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How to add a local repo and treat it as a remote repo
I'm trying to make a local repo act as a remote with the name bak for another local repo on my PC, using the following:
4...
Difference between Repository and Service Layer?
... bool Delete(int id);
T Get(int id);
bool SaveChanges();
}
and call Get(id). Repository layer exposes basic CRUD operations.
Service layer exposes business logic, which uses repository. Example service could look like:
public interface IUserService
{
User GetByUserName(string userN...
How to implement has_many :through relationships with Mongoid and mongodb?
...through or an equivalent feature. It would not be so useful with MongoDB because it does not support join queries so even if you could reference a related collection via another it would still require multiple queries.
https://github.com/mongoid/mongoid/issues/544
Normally if you have a many-many ...
Covariance, Invariance and Contravariance explained in plain English?
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will.
Another example where the subtype relation matters is a method invocation expression:
result = method(a);
Informally speaking, this statement is evaluated by assigning the value of a to the method's first parameter, then executing the body of the method, and then assigning the methods ret...