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Qt events and signal/slots
...ass (have a look at your moc_classname.cpp file for more), but most of the interclass communication that you will produce will probably use signals and slots. Signals can get delivered immediately or deferred via a queue (if you are using threads).
A signal can be generated.
...
Why is the .bss segment required?
...he "copy-down" can be run sequentially, hence faster. If it were not split into the two segments then the initialisation would have to skip the RAM spots belonging to the uninitialised variables, so wasting time.
– CL22
May 15 '13 at 16:29
...
Do fragments really need an empty constructor?
...guments (bundle)
For example:
public static final MyFragment newInstance(int title, String message) {
MyFragment f = new MyFragment();
Bundle bdl = new Bundle(2);
bdl.putInt(EXTRA_TITLE, title);
bdl.putString(EXTRA_MESSAGE, message);
f.setArguments(bdl);
return f;
}
And o...
Why must jUnit's fixtureSetup be static?
... @BeforeClass
public static void beforeClass() {
System.out.println("beforeClass");
}
@AfterClass
public static void afterClass() {
System.out.println("afterClass");
}
@Before
public void before() {
System.out.println(this + "\tbefore");
}
...
FixedThreadPool vs CachedThreadPool: the lesser of two evils
...ll time, and queue type.
public static ExecutorService newFixedThreadPool(int nThreads) {
return new ThreadPoolExecutor(nThreads, nThreads,
0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<Runnable>());
}
public st...
MySQL stored procedure vs function, which would I use when?
...and then execute them). (Dynamic SQL in MySQL stored routines)
Some more interesting differences between FUNCTION and STORED PROCEDURE:
(This point is copied from a blogpost.)
Stored procedure is precompiled execution plan where as functions are not. Function Parsed and compiled at runtime. Stor...
How to get the input from the Tkinter Text Widget?
How to get Tkinter input from the Text widget?
7 Answers
7
...
Why are joins bad when considering scalability?
...mpared to not joining them, because it's work you need to do live at the point where the user requests it.
But remember the alternative is no longer having two separate pieces of data at all; you have to put the two disparate data points in the same record. You can't combine two different pieces of ...
Difference between a “coroutine” and a “thread”?
... is the difference?
Concurrency is the separation of tasks to provide interleaved
execution. Parallelism is the simultaneous execution of multiple
pieces of work in order to increase speed. —https://github.com/servo/servo/wiki/Design
Short answer: With threads, the operating system swit...
Evaluating a mathematical expression in a string
...ws how to parse basic arithmetic expressions. Below, I've rewrapped fourFn into a numeric parser class for easier reuse.
from __future__ import division
from pyparsing import (Literal, CaselessLiteral, Word, Combine, Group, Optional,
ZeroOrMore, Forward, nums, alphas, oneOf)...