Tutorial by Examples: l

Polymorphism is the ability to present the same interface for different underlying implementations. The ability to implement interfaces allows completely decoupling the application logic from the UI, or from the database, or from this or that worksheet. Say you have an ISomeView interface that the...

Swift let bundleIdentifier = NSBundle.mainBundle().bundleIdentifier() NSUserDefaults.standardUserDefaults().removePersistentDomainForName(bundleIdentifier) Objective-C NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier]; [[NSUserDefaults standardUserDefaults] removePersi...

This example splits cubic and bezier curves in two. The function splitCurveAt splits the curve at position where 0.0 = start, 0.5 = middle, and 1 = end. It can split quadratic and cubic curves. The curve type is determined by the last x argument x4. If not undefined or null then it assumes the curv...

This is a basic Hello World program in NASM assembly for 32-bit x86 Linux, using system calls directly (without any libc function calls). It's a lot to take in, but over time it will become understandable. Lines starting with a semicolon(;) are comments. If you don't already know low-level Unix sy...

Detailed instructions on getting deep-learning framework set up or installed. Most frameworks supports interfaces in several languages: Caffe (C++, Python, Matlab) Tensorflow (C++, Python) Theano, Theano wrappers (Keras, Lasagne) (Python) Torch (Lua) Matconvnet (Matlab) Every framework i...

git clean -i Will print out items to be removed and ask for a confirmation via commands like the follow: Would remove the following items: folder/file1.py folder/file2.py *** Commands *** 1: clean 2: filter by pattern 3: select by numbers 4: ask each 5: quit...

After installing a Java SDK, it is advisable to check that it is ready to use. You can do this by running these two commands, using your normal user account: $ java -version $ javac -version These commands print out the version information for the JRE and JDK (respectively) that are on your sh...

>>> import os >>> os.stat(path_to_file).st_size == 0 or >>> import os >>> os.path.getsize(path_to_file) > 0 However, both will throw an exception if the file does not exist. To avoid having to catch such an error, do this: import os def is_empty_...

A commonly used utility library is Lodash. To install it into your Aurelia CLI driven application first you need to install it using Npm. npm install lodash --save Now in your preferred IDE/code editor open up the following file in your project directory: aurelia_project/aurelia.json and scroll do...

boost::program_options::notify can be used to report any errors in the paramters passing #include <boost/program_options.hpp> #include <string> #include <iostream> int main(int argc, char** argv) { namespace po = boost::program_options; po::variables_map vm; po::op...

A default valued command line argument can be specified easily: // declare options desc.add_options() ("name", po::value<std::string>()->required(), "Type your name to be greeted!") ("rank", po::value<std::string>()->default_value("Dark Kn...

Introduction: Swagger is a set of rules/specifications for a format describing REST APIs. It provides a powerful and actively developed ecosystem of tools around this formal specification like code generators and editors. The best part of Swagger is that the documentation of methods, parameters, an...

print "Hello World" import clr from System import Console Console.WriteLine("Hello World")

If you're using an icon to add some extra decoration or branding, it does not need to be announced to users as they are navigating your site or app aurally. Additionally, if you're using an icon to visually re-emphasize or add styling to content already present in your HTML, it does not need to be r...

Rather than use clearRect which makes all pixels transparent you may want a background. To clear with a gradient // create the background gradient once var bgGrad = ctx.createLinearGradient(0,0,0,canvas.height); bgGrad.addColorStop(0,"#0FF"); bgGrad.addColorStop(1,"#08F"); ...

Given the 4 points of a cubic Bezier curve the following function returns its length. Method: The length of a cubic Bezier curve does not have a direct mathematical calculation. This "brute force" method finds a sampling of points along the curve and calculates the total distance spanne...

PM> uninstall-Package EntityFramework -Version 6.1.2

When writing wrappers for unmanaged resources, you should subclass SafeHandle rather than trying to implement IDisposable and a finalizer yourself. Your SafeHandle subclass should be as small and simple as possible to minimize the chance of a handle leak. This likely means that your SafeHandle imple...

A type qualifier; when applied to a type, produces the volatile-qualified version of the type. Volatile qualification plays the same role as const qualification in the type system, but volatile does not prevent objects from being modified; instead, it forces the compiler to treat all accesses to suc...

Value-type fields only C++ declaration typedef union { char c; int i; } CharOrInt; C# declaration [StructLayout(LayoutKind.Explicit)] public struct CharOrInt { [FieldOffset(0)] public byte c; [FieldOffset(0)] public int i; } Mixing value-type and reference...