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Update README.md to state differences between phmap and gtl. #260

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Update README.md to state differences between phmap and gtl. #260

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6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -34,6 +34,12 @@ This repository aims to provide a set of excellent **hash map** implementations,
@byronhe kindly provided this [Chinese translation](https://byronhe.com/post/2020/11/10/parallel-hashmap-btree-fast-multi-thread-intro/) of the README.md.


## Parallel-hashmap or GTL?

The observant among us may have noticed that I have two github repos, [parallel-hashmap](https://github.com/greg7mdp/parallel-hashmap) and [gtl](https://github.com/greg7mdp/gtl), which both provide very similar functionality. Indeed the hash tables in both are equivalent and the code mostly the same. The main difference is that [parallel-hashmap](https://github.com/greg7mdp/parallel-hashmap) only requires a C++11 compiler, while [gtl](https://github.com/greg7mdp/gtl) requires a C++20 compiler.

My recommendation would be to use [gtl](https://github.com/greg7mdp/gtl) if you are compiling with C++20 or higher, and [parallel-hashmap](https://github.com/greg7mdp/parallel-hashmap) otherwise. While the included hash maps are equivalent, [gtl](https://github.com/greg7mdp/gtl) is where new development occurs, and it will include useful new classes.

## Fast *and* memory friendly

Click here [For a full writeup explaining the design and benefits of the Parallel Hashmap](https://greg7mdp.github.io/parallel-hashmap/).
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