{"id":5872,"date":"2020-04-03T06:31:15","date_gmt":"2020-04-03T06:31:15","guid":{"rendered":"https:\/\/www.modernescpp.com\/index.php\/c-20-an-infinite-data-stream-with-coroutines\/"},"modified":"2023-09-28T07:44:45","modified_gmt":"2023-09-28T07:44:45","slug":"c-20-an-infinite-data-stream-with-coroutines","status":"publish","type":"post","link":"https:\/\/www.modernescpp.com\/index.php\/c-20-an-infinite-data-stream-with-coroutines\/","title":{"rendered":"C++20: An Infinite Data Stream with Coroutines"},"content":{"rendered":"

My story to coroutines in C++20 goes on. Today I dive deep into the coroutines framework to create an infinite data stream. You have to read the two previous posts, “C++20: Coroutines – A First Overview<\/a>“, and “C++20: More Details to Coroutines<\/a>” to be prepared.<\/p>\n

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The framework for writing coroutines consists of more than 20 functions that you partially have\u00a0to implement and partially could overwrite. Therefore, you can tailor the coroutine to your needs. In the end, you can, for example, create a generator Generator<int><\/span> for an infinite data stream such as the following one:<\/p>\n

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Generator<<\/span>int<\/span>><\/span> getNext(int<\/span> start =<\/span> 0<\/span>, int<\/span> step =<\/span> 1<\/span>) {\n    auto<\/span> value =<\/span> start;\n    for<\/span> (int<\/span> i =<\/span> 0<\/span>;; ++<\/span>i) {\n        co_yield value;\n        value +=<\/span> step;\n    }\n}\n<\/pre>\n<\/div>\n
Now, we know the destiny of our job. Let’s start.<\/p>\n
The Framework<\/h2>\n
A coroutine comprises three parts: the promise object, the coroutine handle, and the frame.<\/p>\n