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parallel-hashmap
A family of header-only, very fast and memory-friendly hashmap and btree containers.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
As for performance, set is slow, too; unordered_set is likely to perform better, as long as you don't actually need ordering. Any third-party set/unordered_set is going to outperform both. I'd recommend looking into this if you're not opposed to using third-party libs.
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