gtl

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  "desc": "Greg\u0027s Template Library of useful classes",
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  "github_readme_excerpt": "\n\u003cimg src=\"https://github.com/greg7mdp/gtl/blob/main/html/img/phash.png?raw=true\" width=\"120\" align=\"middle\"\u003e\n\n# Greg\u0027s Template Library of useful classes.\n\n  [![License: Apache-2.0](https://img.shields.io/badge/License-Apache-yellow.svg)](https://opensource.org/licenses/Apache-2.0) [![Linux](https://github.com/greg7mdp/gtl/actions/workflows/linux.yml/badge.svg)](https://github.com/greg7mdp/gtl/actions/workflows/linux.yml)  [![MacOS](https://github.com/greg7mdp/gtl/actions/workflows/macos.yml/badge.svg)](https://github.com/greg7mdp/gtl/actions/workflows/macos.yml) [![Windows](https://github.com/greg7mdp/gtl/actions/workflows/windows.yml/badge.svg)](https://github.com/greg7mdp/gtl/actions/workflows/windows.yml)\n\n## Overview\n\nThis repository aims to provide many classes that are commonly needed in substantial C++ projects, but that are either not available in the C++ standard library, or have a specification which makes them slower than they could be. In some cases, the C++ standard requirements prevents from providing faster alternatives (for example the  pointer stability requirement for unordered maps or sets prevents providing implementations using open addressing).\n\nAmong the many classes offered by [gtl](https://github.com/greg7mdp/gtl), we have a set of excellent **hash map** implementations, as well as a **btree** alternative to `std::map` and `std::set`. These are *drop-in replacements* for the standard C++ classes and provide the same API, but are significantly faster and use less memory.\n\nWe also have a fast `bit_vector` implementation, which is an alternative to `std::vector\u003cbool\u003e` or `std::bitset`, providing both dynamic resizing and a good assortment of bit manipulation primitives, as well as a novel `bit_view` class allowing to operate on subsets of the `bit_vector`.\n\nWe have `lru_cache` and `memoize` classes, both with very fast multi-thread versions relying of the mutex sharding of the parallel hashmap classes.\n\nWe also offer an `intrusive_ptr` class,",
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    "bit-vector",
    "bit-vectors",
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    "hash",
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