Tutorial by Topics: de

Separates the construction of a complex object from its representation so that the same construction process can create different representations. Separate the logic from representation. Reuse logic to work with different set of data.

What is undefined behavior (UB)? According to the ISO C++ Standard (§1.3.24, N4296), it is "behavior for which this International Standard imposes no requirements." This means that when a program encounters UB, it is allowed to do whatever it wants. This often means a crash, but it may si...

<pre>Formatted text</pre> <code>Inline Code</code> The code element should be used for any kind of "string that a computer would recognize" (HTML5), for example: source code terms from markup/programming languages (element names, function names, etc.) ...

DEX means Android app's (APK) executable bytecode files in the form of Dalvik Executable (DEX) files, which contain the compiled code used to run your app. The Dalvik Executable specification limits the total number of methods that can be referenced within a single DEX file to 65,536 (64K)—includin...

The Pandas datareader is a sub package that allows one to create a dataframe from various internet datasources, currently including: Yahoo! Finance Google Finance St.Louis FED (FRED) Kenneth French’s data library World Bank Google Analytics For more information, see here.

Code contracts allow for compile or runtime analysis of pre/post conditions of methods and invariant conditions for objects. These conditions may be used to ensure callers and return value match valid states for application processing. Other uses for Code Contracts include documentation generati...

Aspnet core is built with Dependency Injection as one of its key core concepts. It introduces one conforming container abstraction so you can replace the builtin one with a third-party container of your choice. IServiceCollection.Add(ServiceDescriptor item); IServiceCollection.AddScoped(Type ...

There will come a time where your CakePHP application will need to query more than one database. The method for requesting Models from non-default databases is not present in the official documentation.

dq = deque() # Creates an empty deque dq = deque(iterable) # Creates a deque with some elements dq.append(object) # Adds object to the right of the deque dq.appendleft(object) # Adds object to the left of the deque dq.pop() -> object # Removes and returns the righ...

You will need the Qt SQL plugin corresponding to the type given to QSqlDatabase::addDatabase If you don't have the required SQL plugin, Qt will warn you that it can't find the requested driver If you don't have the required SQL plugin you will have to compile them from the Qt source

An error 1009 is a general error that arises when you are trying to receive a value out of a variable or property that has a value of null. The examples provided expose various cases where this error arises, together with some recommendations on how to mitigate the error. The dreaded and often ask...