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Optimizing away a “while(1);” in C++0x
...theory is required to prove termination, in the latter case, we need
to know something about the possible values of j to do so. Wrap-around
for unsigned integers may complicate some of this reasoning further.)
This issue seems to apply to almost all loop restructuring
transformations, inc...
How does deriving work in Haskell?
...Generic Classes, but it was rarely used, as it was somewhat weak.
That has now been taken out, and work is ongoing to integrate a new generic deriving mechanism as described in this paper: http://www.dreixel.net/research/pdf/gdmh.pdf
For more on this, see:
GHC wiki: http://hackage.haskell.org/tra...
RabbitMQ and relationship between channel and connection
...
I think this reference to the Java Client API is now outdated and in fact today's reference directly contradicts the quote in this answer. Today's reference says "Channel instances must not be shared between threads".
– Edwin Dalorzo
J...
How does having a dynamic variable affect performance?
... that represents "there's going to be a dynamic call to Foo here".
OK, so now that you've got the call site, how does the invocation work?
The call site is part of the Dynamic Language Runtime. The DLR says "hmm, someone is attempting to do a dynamic invocation of a method foo on this here object....
Java 8 Streams: multiple filters vs. complex condition
...aryStatistics{count=100, sum=10320, min=82, average=103.200000, max=127}
now the code:
enum Gender {
FEMALE,
MALE
}
static class User {
Gender gender;
int age;
public User(Gender gender, int age){
this.gender = gender;
this.age = age;
}
public Gender...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...e theory behind cursors and how JDBC should be used. If you don't need to know the background, you can skip this and go straight to 'Eliminating Leaks'.
What is a cursor?
A cursor is a resource on the database that holds the state of a query, specifically the position where a reader is in a Result...
How do I plot in real-time in a while loop using matplotlib?
...
This answer requires a-priori knowledge of the x/y data... which is not needed: I prefer 1. don't call plt.axis() but instead create two lists x and y and call plt.plot(x,y) 2. in your loop, append new data values to the two lists 3. call plt.gca().lines[0...
Why is list initialization (using curly braces) better than the alternatives?
...an call completely different functions, and this is an important thing to know. It can even result in calls that seem unintuitive. Saying that you should prefer {} by default will lead to people misunderstanding what's going on. This isn't your fault, though. I personally think it's an extremely poo...
C++ templates that accept only certain types
...would only match myBaseType exactly. Before dismissing Boost, you should know that most of it is header-only template code -- so there's no memory or time cost at runtime for things you don't use. Also the particular things you'd be using here (BOOST_STATIC_ASSERT() and is_base_of<>) can be ...
Java EE web development, where do I start and what skills do I need? [closed]
...re JSF libraries via Maven? and How to install and use CDI on Tomcat?
I know there is Hibernate for an ORM.
Previously, during the J2EE era, when JPA didn't exist and EJB2 was terrible, Hibernate was a standalone framework and often used in combination with Spring to supplant EJB. Since the intro...