Archive for category: C++20

C++20 Modules: Private Module Fragment and Header Units

September 2, 2021

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In the last weeks, I learned something new about modules in C++20: private modules fragments and header…

Automatically Resuming a Job with Coroutines on a Separate Thread

March 9, 2021

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In my last post "Starting Jobs with Coroutines", I applied co_await to start a job. In this post, I improve…

Starting Jobs with Coroutines

March 7, 2021

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C++20 has three new keywords to make a coroutine out of a function: co_return, co_yield, and co_await.…

A Generic Data Stream with Coroutines in C++20

March 7, 2021

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In my last post in this mini-series on coroutines from the practical perspective, I presented the workflow…

An Infinite Data Stream with Coroutines in C++20

March 6, 2021

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In this post, I analyze the new keyword co_yield. Thanks to co_yield, you can create an infinite data…

Executing a Future in a Separate Thread with Coroutines

March 6, 2021

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This post concludes my posts about co_return in C++20. I started with an eager future, and continued…

Lazy Futures with Coroutines

March 4, 2021

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Based on the coroutines-based implementation of a simple future in my last post "Implementing Simple…

Implementing Simple Futures with Coroutines

February 22, 2021

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Instead of return, a coroutine uses co_return returning its result. In this post, I want to implement…

TimelineCpp20

Synchronized Output Streams with C++20

February 18, 2021

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What happens when you write without synchronization to std::cout? You get a mess. With C++20, this should…

TimelineCpp20

An Improved Thread with C++20

February 12, 2021

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std::jthread stands for joining thread. In addition to std::thread (C++11), std::jthread automatically…

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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 […]