Archive for category: C++20

Feature Testing Macros

August 5, 2024

The feature testing macros is a relatively unknown feature in C + + 20. They give you the definitive…

Cooperative Interruption of a Thread in C++20: Callbacks

July 15, 2024

I introduced in my last post "Cooperative Interruption of a Thread in C++20" callbacks. Today, I dive…

TimelineCpp20Interruption

Cooperative Interruption of a Thread in C++20

July 1, 2024

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A typical question in my C++ seminars is: Can a thread be killed? Before C++20, my answer is no. With…

Chrono: Input

June 24, 2024

You can also apply the format specifier for formatted input. This post is the eleventh in my…

Chrono I/O: Unformatted and Formatted

June 17, 2024

Chrono I/O consists of reading and writing chrono types. The various chrono types support unformatted…

Chrono I/O

May 20, 2024

Chrono I/O consists of reading and writing chrono types. The various chrono types support unformatted…

Time Zones: Online Classes

May 13, 2024

Today, I will continue to present the functionality of the time zones of the C++20 chrono extension. This…

TimelineCpp20CoreLanguage

Time Zones: Details

May 6, 2024

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Today, I present the time-zones functionality of the C++20 extension. This post is the seventh…

C++20: Query Calendar Dates and Ordinal Dates

April 22, 2024

The extended chrono library makes it relatively easy to ask for the time duration between calendar dates. This…

C++20: Displaying and Checking Calendar Dates

April 15, 2024

I created calendar dates in my last post, "C++20: Creating Calendar Dates," and I will display and check…

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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, […]
Reflection in C++26: MetafunctionsSeptember 30, 2024 - 10:14 am
Reflection offers many metafunctions that run at compile time. The metafunctions are declared as consteval. consteval creates a so-called immediate function. Each invocation of an immediate function creates a compile-time constant. To say it more directly. A consteval (immediate) function is executed at compile-time. Read more about consteval and constinit in my previous post: Two […]