Tag Archive for: Tasks

Posts

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…

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…

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The End of my Detour: Unified Futures

June 15, 2018

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After the last post to executors, I can finally write about the unified futures. I write in the post…

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C++ Core Guidelines: More Rules about Concurrency and Parallelism

April 27, 2018

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Writing multithreading programs is hard, even harder if the program should be correct. The rules of the…

async

std::future Extensions

February 24, 2017

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Tasks in the form of promises and futures have in C++11 an ambivalent reputation. On the one hand, they…

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Multithreaded: Summation with Minimal Synchronization

September 7, 2016

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Until now, I've used two strategies to summate a std::vector. First, I did the whole math in one thread…

ConditionVariableVersusTask

Thread Synchronization with Condition Variables or Tasks

June 11, 2016

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In case you use promise and future to synchronize threads, they have much in common with condition variables.…

async

The Special Futures

June 6, 2016

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The parent of a thread has to take care of their child. The parent can wait until his child is done or…

Latest news

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 […]