Introduction (required): Title and brief overview of what the poster reports on. Title: Pipeline architectures in C++: overloaded pipe operator | std::expected and its monadic operations Brief programmers. One of its most characteristic patterns is composition of functions in the form of a pipeline pattern. Since C++20 we can use the ranges library with its characteristic function composition abilities thanks to the overloaded pipe operator. In this poster I show how to implement a custom pipeline framework that employs std::expected, available since C++23. An overloaded custom pipe operator

49Fern! 50 manya227 June 2024 Pipeline pipeline({ vadd(a, b, len, out_1), vadd(out_1, c, len, out_2), }); pipeline.constructPipeline(); pipeline = pipeline.finalize(); void my_fused_impl(const size;Fern! 50 manya227 June 2024 Pipeline pipeline({ vadd(a, b, len, out_1), vadd(out_1, c, len, out_2), }); pipeline.constructPipeline(); pipeline = pipeline.finalize(); void my_fused_impl(const len1); for(int64 t x2 = out 2 idx; x2 < out 2 idx + out 2 size;Fern! 50 pipeline.constructPipeline(); pipeline = pipeline.finalize(); void my_fused_impl(const Array a, const Array b

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.7 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 definition (which is included some paragraphs above). 2.1.3 Write a pipeline to store the items extracted Now let’s write an Item Pipeline that serializes and stores the extracted item into a file using pickle: Built-in support for exporting data in multiple formats, including XML, CSV and JSON • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support

in an interactive environment. Item Loaders Populate your items with the extracted data. Item Pipeline Post-process and store your scraped data. Built-in services Logging Understand the simple logging class definition (which is included some paragraphs above). Write a pipeline to store the items extracted Now let’s write an Item Pipeline that serializes and stores the extracted item into a file using pickle sources Built-in support for exporting data in multiple formats, including XML, CSV and JSON A media pipeline for automatically downloading images (or any other media) associated with the scraped items Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 for example) or the storage backend (FTP or Amazon S3, for example). You can also write an item pipeline to store the items in a database very easily. 2.1.5 Review scraped data If you check the scraped_data S3, local filesystem) 2.1. Scrapy at a glance 7 Scrapy Documentation, Release 0.12.0 • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support

in an interactive environment. Item Loaders Populate your items with the extracted data. Item Pipeline Post-process and store your scraped data. Feed exports Output your scraped data using different backend (FTP or Amazon S3 [http://aws.amazon.com/s3/], for example). You can also write an item pipeline to store the items in a database very easily. Review scraped data If you check the scraped_data formats (JSON, CSV, XML) and storing them in multiple backends (FTP, S3, local filesystem) A media pipeline for automatically downloading images (or any other media) associated with the scraped items Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 for example) or the storage backend (FTP or Amazon S3, for example). You can also write an item pipeline to store the items in a database very easily. 2.1.5 Review scraped data If you check the scraped_data S3, local filesystem) 2.1. Scrapy at a glance 7 Scrapy Documentation, Release 0.18.4 • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 for example) or the storage backend (FTP or Amazon S3, for example). You can also write an item pipeline to store the items in a database very easily. 2.1.5 Review scraped data If you check the scraped_data S3, local filesystem) 2.1. Scrapy at a glance 7 Scrapy Documentation, Release 0.16.5 • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 for example) or the storage backend (FTP or Amazon S3, for example). You can also write an item pipeline to store the items in a database very easily. 2.1.5 Review scraped data If you check the scraped_data S3, local filesystem) 2.1. Scrapy at a glance 7 Scrapy Documentation, Release 0.14.4 • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 for example) or the storage backend (FTP or Amazon S3, for example). You can also write an item pipeline to store the items in a database very easily. 2.1.5 Review scraped data If you check the scraped_data S3, local filesystem) 2.1. Scrapy at a glance 7 Scrapy Documentation, Release 0.20.2 • A media pipeline for automatically downloading images (or any other media) associated with the scraped items • Support