Qt → Qt/C++ - Tutorial 083. Creating a dynamic library and connecting it to another project

Qt, DLL, dll, Windows, dynamic

The forum raised the question of how to create a dynamic library and correctly connect it to a third-party project. Periodically, such questions arise, so consider one option of creating a dynamic dll for Windows using the standard wizards in …

Design Patterns → Structural Design Patterns - Adapt

шаблоны проектирования, приспособленец, flyweight

Goals

• Using sharing to effectively use a large number of objects.
• Motif's GUI strategy to replace heavyweight widgets with lightweight widgets.

Problems

Designing objects down to the lowest levels of system "granularity" provides optimal flexibility, but can be prohibitively expensive …

Design Patterns → Structural Design Patterns - Facade

шаблоны проектирования

Goals

• Provide a unified interface for a set of interfaces in a subsystem. A facade defines a higher-level interface that makes the subsystem easier to use.
• Wrap a complex subsystem with a simpler interface.

Problems

The client access segment requires …

Python → Example - Object Pool in Python

python, pool, пул, шаблоны проектирования

Example of the design pattern An object pool in the Python programming language.

"""
Offer a significant performance boost; it is most effective in
situations where the cost of initializing a class instance is high, the
rate of instantiation of …

Java → Example - Object Pool in Java

Java, пул, шаблоны проектирования

Example of the design pattern An object pool in the Java programming language.

// ObjectPool Class

public abstract class ObjectPool<T> {
  private long expirationTime;

  private Hashtable<T, Long> locked, unlocked;

  public ObjectPool() {
    expirationTime = 30000; // 30 seconds
    locked = …

C++ → Example - Object Pool in C++

шаблоны проектирования, пул, C++

Example of the design pattern An object pool in the C ++ programming language.

#include <string>
#include <iostream>
#include <list>
class Resource
{
    int value;
    public:
        Resource()
        {
            value = 0;
        }
        void reset()
        {
            value = 0;
        }
        int …

Design Patterns → Structural Design Patterns - Decorator

шаблоны проектирования, decorator, декоратор

Goals

• Add additional features and functionality to the object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
• Client-specified decoration of the interface of the main object by recursively wrapping it.
• Wrap the gift, put it in the …

PHP → Example - Factory method in PHP

шаблоны проектирования, factory, method, PHP

In the Factory Method Pattern, a factory method defines what functions must be available in the non-abstract or concrete factory. These functions must be able to create objects that are extensions of a specific class. Which exact subclass is created …

Delphi → Example - Factory method in Delphi

Delphi, шаблоны проектирования, factory, method

This pattern is useful when you want to encapsulate the construction of a class and isolate knowledge of the concrete class from the client application through an abstract interface.

Один из примеров этого может возникнуть, если у вас есть объектно-ориентированное …

Design Patterns → Structural Design Patterns - Composite

шаблоны проектирования, composite, компоновщик

Goals

• Arrange objects into tree structures to represent entire parts of the hierarchy. The linker allows clients to treat individual objects and compositions of objects in the same way.
• Recursive composition
• "Directories contain entries, each of which can be a …