gtl | Greg 's Template Library of useful classes

gtl is a C++ library. gtl has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This 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). Among the many classes offered by 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. We also have a fast bit_vector implementation, which is an alternative to std::vector 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. We have lru_cache and memoize classes, both with very fast multi-thread versions relying of the mutex sharding of the parallel hashmap classes. We also offer an intrusive_ptr class, which uses less memory than std::shared_ptr, and is simpler to construct. We are happy to integrate new classes into gtl, provided the license is compatible with ours, and we feel they will be useful to most users. Often, when integrating classes from other sources, we are able to improve their performance both in time and space by using other classes already available in gtl (such as hash maps, btree, bit_vector, etc...) instead of the spandard ones. gtl requires a C++20 compiler. We currently support: Visual Studio 2019 +, gcc 8 +, and clang 10 + (or Xcode 12 + on MacOS). Because gtl is a header only library, installation is trivial, just copy the include/gtl directory to your project somewhere in your include path and you are good to go. We also support common package managers such as Conan (package name greg7mdp-gtl) and vcpkg.