Tutorial by Examples: v

This example uses Icarus and GTKWave. Installation instructions for those tools on OSx are provided elsewhere on this page. Lets begin with the module design. This module is a BCD to 7 segment display. I have coded the design in an obtuse way simply to give us something that is easily broken and...

One time definition of a generic base class with recursive type specifier. Each node has one parent and multiple children. /// <summary> /// Generic base class for a tree structure /// </summary> /// <typeparam name="T">The node type of the tree</typeparam> pub...

A Java 8 compatibility kit for Scala. Most examples are copied from Readme Converters between scala.FunctionN and java.util.function import java.util.function._ import scala.compat.java8.FunctionConverters._ val foo: Int => Boolean = i => i > 7 def testBig(ip: IntPredicate) = ip.tes...

The vertical layout set up the object inside it vertically. #include "mainwindow.h" #include <QApplication> #include <QMainWindow> #include <QWidget> #include <QVBoxLayout> #include <QPushButton> int main(int argc, char *argv[]) { QApplication...

/*! * \class MainMenuListView * \brief The MainMenuListView class is a QListView with a header displayed * on top. */ class MainMenuListView : public QListView { Q_OBJECT /*! * \class Header * \brief The header class is a nested class used to display the hea...

QSize MainMenuListView::Header::sizeHint() const { // fontmetrics() allows to get the default font size for the widget. return QSize(menu->headerAreaWidth(), fontMetrics().height()); } void MainMenuListView::Header::paintEvent(QPaintEvent* event) { // Catches the paint event ...

$> perl -MFoo::Bar\ 9999 $> Foo::Bar version 9999 required--this is only version 1.1.

There are some situations where you won't be sure what type a variable is when it is returned from a function. You can always check a variable's type by using var.(type) if you are unsure what type it is: x := someFunction() // Some value of an unknown type is stored in x now switch x := x.(type...

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First, I will place my date into a Macro Variable. NOTE: I find that date9. works great with IBM® Netezza® SQL and Transact-SQL. Use whichever format that works for the type of SQL you're executing. data _null_; call symput('testDate',COMPRESS(put(today(),date9.))); ;RUN; %PUT ...

Here follows a example of what can be done with nested StackViews, giving the user the impression of a continuous scrolling experience using complex user interface elements or alignments.

A frequent question about StackViews inside Scrollviews comes from ambiguous with/heigh alerts on interface builder. As this answer explained, it is necessary to: Add in the UIScrollView a UIView (the contentScrollView); In this contentScrollView, set top, bottom, left and right margins to 0 Se...

The big gotcha about scrolling is to determine the offset necessary to present (for instance) a Textfield inside a StackView with is inside the ScrollView. If you try to get the position of Textfield.frame.minY can be 0, because the minY frame is only considering the distance between the element an...

Sometimes Android's logcat is running infinitely with errors coming from some process not own by you, draining battery or just making it hard to debug your code. A convenient way to fix the problem without restarting the device is to locate and kill the process causing the problem. From Logcat 03...

You can asynchronously return a value for each processed message if you send an AsyncReplyChannel<'a> as part of the message. type MessageWithResponse = Message of InputData * AsyncReplyChannel<OutputData> Then the mailbox processor can use this channel when processing the message to...

Blocking Operation Example let loop = (i, max) => { while (i < max) i++ return i } // This operation will block Node.js // Because, it's CPU-bound // You should be careful about this kind of code loop(0, 1e+12) Non-Blocking IO Operation Example let i = 0 const step = max =...

In the last example, you can see that EF figures out which column is the foreign key and where should it point to. How? By using conventions. Having a property of type Person that is named Person with a PersonId property leads EF to conclude that PersonId is a foreign key, and it points to the prima...

As an example we want to set all string properties of a sample class class TestClass { val readOnlyProperty: String get() = "Read only!" var readWriteString = "asd" var readWriteInt = 23 var readWriteBackedStringProperty: String = "" ...

Let's define a grammar enabling us to perform additions, multiplications with the usage of parenthesis. To add more value to this example, we are going to compute the result of the arithmetic expression. Summary of the grammar: expression → times expression → times '+' expression times → elemen...

Step 1 – Install LAMP To start with Laravel, we first need to set up a running LAMP server. If you have already running LAMP stack skip this step else use followings commands to set up lamp on Ubuntu system. Install PHP 5.6 $ sudo apt-get install python-software-properties $ sudo add-apt-reposit...