Archive for category: C++ Core Guidelines

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C++ Core Guidelines: std::array and std::vector are your Friends

May 24, 2019

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In 99 % of your use cases for a sequential container, you are outstanding with a std::array or a std::vector.…

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C++ Core Guidelines: The Standard Library

May 16, 2019

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The rules to the C++ standard library are mainly about containers, strings, and iostreams. Curiously,…

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More Details to Modules

May 5, 2019

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My last post gave you an introduction to modules in C++20. This post shows how to use existing…

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Modules

April 29, 2019

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Modules are one of the five prominent features of C++20. Modules will overcome the restrictions of header…

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C++ Core Guidelines: The Remaining Rules about Source Files

April 25, 2019

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Today, I complet the rules of the C++ core guidelines to source files. They are about header files and…

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C++ Core Guidelines: Source Files

April 16, 2019

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The organization of source files is a topic quite seldom addressed in C++. With C++20, we will get modules,…

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C++ Core Guidelines: Mixing C with C++

March 8, 2019

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Due to the same history of C and C++, both languages are closely related. Because neither of them is…

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Types-, Non-Types, and Templates as Template Parameters

February 27, 2019

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I assume you saw the additional keywords typename or template used before a name in a template. Me too.…

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Templates: Misconceptions and Surprises

February 22, 2019

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I often teach the basics of templates. Templates are special. Therefore, I encounter many misconceptions…

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C++ Core Guidelines: Surprise included with the Specialisation of Function Templates

February 15, 2019

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Today, I finish the C++ core guidelines rules to templates with a big surprise for many C++ developers.…

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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, […]