Archive for category: Patterns

Broker

Broker

April 11, 2023

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The Broker Pattern structures distributed software systems that interact with remote service invocations.…

PipesAndFilter

Pipes-and-Filters

April 2, 2023

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The Pipes-and-Filters architecture pattern describes the structure of systems that process data streams. The…

Layers

Layers

March 26, 2023

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The layers pattern splits a task into horizontal layers. Each layer has a specific responsibility and…

Layers

Architectural Patterns

March 19, 2023

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Architectural patterns describe the fundamental structure of a software system and are often based on…

QualitätsmerkmaleFokusWartbarkeit EN

How can you recognise a good software architecture?

March 6, 2023

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I'm happy to present today a guest post from Alexander Eisenhuth. Alexander will write about his passion:…

IdiomsPolymorphismTemplates

Idioms for Polymorphism and Templates

March 5, 2023

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This post is unique because I have written about all the topics mentioned in this post already. Therefore,…

ClassIdioms

Covariant Return Type

February 26, 2023

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The Covariant Return Type of a member function allows an overriding member function to return a narrower…

ClassIdioms

The Iterator Protocol

February 19, 2023

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When you want to use a user-defined type in a range-based for-loop, your user-defined type has to implement…

ClassIdioms

The Null Object Pattern

February 12, 2023

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A Null Object encapsulates a do nothing behavior inside an object. It is often pretty comfortable to…

ClassIdioms

Value Objects

February 5, 2023

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A value object is a small object whose equality is based on state, but not identity. Typical value objects…

Latest news

std::executionNovember 18, 2024 - 9:03 am
std::execution, previously known as executors or Senders/Receivers, provides “a Standard C++ framework for managing asynchronous execution on generic execution resources“. (P2300R10) Side Note Change of plans. My original plan was to present the C++26 library after the core language. However, the implementation status of the library is not good enough. Therefore, I decided to continue […]
C++26 Core Language: Small ImprovementsNovember 4, 2024 - 8:34 am
There are more small improvements in the C++26 language, which you should know. static_assert extension First, here’s the syntax of static_assert in C++11: static_assert(compile time predicate, unevaluated string) With C++26, the string can be a user-defined type having the following properties: static_assert can now be used with a format string. Here’s a nice example from […]
Placeholders and Extended Character SetOctober 28, 2024 - 10:19 am
Placeholders are a nice way to highlight variables that are no longer needed. Additionally, the character set of C++26 will be extended. Placeholders Structured bindings are a C++17 feature that allows you to bind multiple variables to the elements of a structured object. The following program demonstrates using tuples and structured bindings to return and […]
Contracts in C++26October 21, 2024 - 9:54 am
Contracts allow you to specify preconditions, postconditions, and invariants for functions. Contracts should already be part of C++20 but were removed in the standard meeting in Cologne. Here is what Herb Sutter said about contracts on Sutter’s Mill: “contracts is the most impactful feature of C++20 so far, and arguably the most impactful feature we […]
Reflection in C++26: Determine the LayoutOctober 14, 2024 - 9:42 am
Thanks to reflection, you can determine the layout of types. My examples are based on the reflection proposal P2996R5. Class Layout The following program determines the class layout of a few members. // classLayout.cpp #include <experimental/meta> #include <iostream> #include <utility> #include <vector> #include <array> struct member_descriptor { std::size_t offset; std::size_t size; bool operator==(member_descriptor const&) const […]
Reflection in C++26: Metafunctions for Enums and ClassesOctober 7, 2024 - 1:53 pm
Today, I continue my journey through reflection in C++26 and play with enums and classes. The names of the metafunctions to access an Enum or a Class member are often identical. Access the Members of an Enum The following program is based on one by Daveed Vandevoorde. Daveed is one of the fathers of reflection, […]