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= Existing Boost Libraries
:navtitle: Existing Boost Libraries

== FAQ

. *What are the biggest pain points that developers are running into, that are not addressed by current Boost libraries?*
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Some Boost libraries have a steep learning curve, especially for newcomers to pass:[C++]. Simplifying the API design, providing  extensive documentation, and offering beginner-friendly tutorials helps lower the barrier to entry and make your library more accessible to a wider audience. Other pain points include support for modern language features, working with concurrency and parallelism, providing a seamless experience across different platforms, and providing optimal performance.

. *For reference, what libraries are good examples of ones that are easy to learn?*
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One library known for its relatively straightforward API and ease of learning compared to some others is boost:filesystem[]. 
This library provides portable facilities to work with files and directories, offering an intuitive interface for common file system operations such as file creation, deletion, copying, moving, and directory traversal. Its design is user-friendly and follows familiar patterns. boost:filesystem[] documentation is comprehensive and well-structured. Overall, boost:filesystem[] is often recommended as a starting point for those looking to dip their toes into Boost libraries due to its simplicity, practicality, and broad applicability across various projects.
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Other libraries that are known for their shallow learning curve include boost:optional[] which is particularly useful for handling functions that may return an optional value or dealing with nullable data types in a safe and clear manner. boost:any[] allows developers to store objects of different types in a single container and retrieve them without typecasting. boost:type-index[]  provides facilities for obtaining type information at runtime, making it easy to work with types dynamically.

. *What libraries have the steepest learning curve?*
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While all Boost libraries have their complexities, some are known to have steeper learning curves due to their advanced nature or the intricacies of the domain they address. boost:spirit[] is a parsing and generation library that uses a domain-specific embedded language (DSEL) implemented as pass:[C++] template metaprograms. It allows developers to define parsers and generators directly within code using EBNF-like syntax. However, the template-based approach and the metaprogramming techniques used can make it challenging for newcomers to grasp, especially those unfamiliar with advanced template programming or parsing theory.
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boost:mp11[] (Meta-Programming Library) is a powerful library for metaprogramming, providing tools for compile-time computation, type manipulation, and template metaprogramming. It allows developers to perform complex compile-time computations and transformations using a functional programming style. However, the functional programming paradigm and the intricacies of template metaprogramming can be daunting for beginners and require a solid understanding of pass:[C++] templates and meta-programming concepts.

. *What libraries were the most ambitious in what they attempted to achieve?*
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The many notable examples include:
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* boost:graph[] provides a generic and efficient framework for working with graphs, making it suitable for a variety of applications in areas such as network analysis, optimization, and data visualization.
* boost:compute[] provides abstractions for memory management, kernel execution, and data parallelism, enabling developers to harness the computational power of modern hardware for tasks such as numerical simulations, image processing, and machine learning.
* boost:spirit[] is ambitious in its goal of providing a high-level and composable framework for parsing complex data formats and domain-specific languages entirely within pass:[C++] code, without the need for external tools or preprocessors.
* boost:hana[] aims to simplify and modernize metaprogramming in pass:[C++], making it more accessible and powerful for developing generic libraries and applications.

. *What libraries were the least ambitious technically?*
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The useful utilities such as boost:any[], boost:variant[], and boost:optional[] offer relatively simple functionality. Another simpler library is boost:bimap[] which provides a container for maintaining one-to-one mappings between keys and values. While bidirectional maps are a useful data structure, the functionality provided is relatively straightforward and focused on this specific use case.


== See Also


* xref:contributors-faq.adoc[]

