https://klemens.dev/ Recent content on Klemens Hugo en Fri, 15 Nov 2024 00:00:00 +0000 https://klemens.dev/about/ Fri, 15 Nov 2024 00:00:00 +0000 https://klemens.dev/about/ I am a professional software engineer with twelve years of experience. My favorite language is C++, mostly used for systems and Embedded programming. I am the author of boost.process & boost.cobalt and contributor to multiple other libraries, among them boost.asio. I work as an independent software consultant and am generally available for remote contracting. https://klemens.dev/portfolio/cobalt/ Thu, 16 Nov 2023 00:00:00 +0000 https://klemens.dev/portfolio/cobalt/ Boost.cobalt provides easy to use & high performances coroutines for single threaded applications. https://klemens.dev/posts/03_coroutines/ Thu, 27 Jul 2023 00:00:00 +0000 https://klemens.dev/posts/03_coroutines/ This is the first post in a series explaining C++20 coroutines by example. Goal The goal for this article is to create a simple non-recursive stream serializer, that can be used like this: stream::serializer serialize_ints(std::vector<int> data) { for (auto idx = 0u; idx < data.size(); idx++) { if (idx != 0) co_yield ','; co_yield std::to_string(data[idx]); } } int main(int argc, char *argv[]) { auto s = serialize_ints({1,2,3,4,5,6,7,8,9,10}); std::string buffer; buffer.resize(10); using std::operator""sv; assert(s. https://klemens.dev/posts/02_asio_timeout/ Mon, 02 Jan 2023 00:00:00 +0000 https://klemens.dev/posts/02_asio_timeout/ Since asio added and beast implemented per-operation cancellation, the way timeouts can be implemented in asio code has changed significantly. In this article, we’ll go from simple timeouts to building our own timeout completion token helper. Cancellation A timeout is a defined interval after which a cancellation will be triggered, if an action didn’t complete by then. Timeouts can be a way of handling runtime errors, but one should generally be prudent about their usage. https://klemens.dev/posts/01_asio_deferred/ Sun, 11 Dec 2022 00:00:00 +0000 https://klemens.dev/posts/01_asio_deferred/ Asio deferred Aysnc operations Asio introduced the concept of an async_operation, which describes a primary expression that can be invoked with a completion token. In C++20 this is also a language concept. asio::io_context ctx; asio::async_operation auto post_op = [&](auto && token){return asio::post(ctx, std::move(token));}; auto f = post_op(asio::use_future); ctx.run(); f.get(); // void Async operations can be used in parallel_group and directly co_awaited in C++20. asio::deferred as a completion token Using asio::deferred as a completion token, will give you a lazy async_operation as the result value. https://klemens.dev/portfolio/metal-test/ Mon, 16 Nov 2020 00:00:00 +0000 https://klemens.dev/portfolio/metal-test/ An open-source toolchain for testing on embedded devices using gdb & serial ports. https://klemens.dev/portfolio/process/ Wed, 16 Nov 2016 00:00:00 +0000 https://klemens.dev/portfolio/process/ Boost.process is a library for managing sub-processes on linux, windows, Osx and BSD.