Archive for category: C++20

TimelineCpp20Interruption

Cooperative Interruption of a Thread in C++20

February 4, 2021

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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…

TimelineCpp20

Barriers and Atomic Smart Pointers in C++20

January 29, 2021

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In my last post, I introduced latches in C++20. A latch enables its threads to wait until a counter becomes…

TimelineCpp20

Latches in C++20

January 18, 2021

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Latches and barriers are coordination types that enable some threads to wait until a counter becomes…

TimelineCpp20

Semaphores in C++20

January 14, 2021

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Semaphores are a synchronization mechanism used to control concurrent access to a shared resource. They…

TimelineCpp20CoreLanguage

Performance Comparison of Condition Variables and Atomics in C++20

December 19, 2020

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After the introduction to std::atomic_flag in my last post, Synchronization with Atomics in C++20, I…

TimelineCpp20CoreLanguage

Synchronization with Atomics in C++20

December 12, 2020

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Sender/receiver workflows are pretty common for threads. In such a workflow, the receiver is waiting…

TimelineCpp20CoreLanguage

Atomic References with C++20

December 8, 2020

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Atomics receives a few essential extensions in C++20. Today, I start with the new data type std::atomic_ref. The…

TimelineCpp20CoreLanguage2

Bit Manipulation with C++20

December 3, 2020

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This post concludes my presentation of library features in C++20. Today I am writing about the class…

TimelineCpp20CoreLanguage

Feature Testing with C++20

November 27, 2020

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When your program's compilation broke with a brand-new C++20 feature, you often end with a few questions:…

TimelineCpp20CoreLanguage

Safe Comparisons of Integrals with C++20

November 17, 2020

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When you compare signed and unsigned integers, you may not get the result you expect. Thanks to…

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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 […]