STD::__IS_FAST_HASH(3)

✨ NAME ✨

std::__is_fast_hash< _Hash > — bestie's lil' hint-o-meter about how speedy your hash functions are 💅

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🌸 SYNOPSIS 🌸

#include <functional>

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💖 Detailed Description 💖

okay so picture this: a template that's literally just vibes-checking your hasher 👑

template<typename _Hash>
struct std::__is_fast_hash< _Hash >

It's giving "Hint about performance of hash functions." No cap — that's the whole job description.

Here's the tea, fr fr: if a hash function object is not fast, the hash-based containers will cache the hash code. That's the whole reason this trait exists. 🫶

And the default behavior? It considers hashers fast unless you say otherwise. Like, it just assumes the best in everyone until proven wrong, which honestly? main character energy. 🌈

Now the part where you get to customize things: users can specialize this for their own hash functions in order to force caching of hash codes in unordered containers. Slay, you do you boo. ✨

⚠️ BUT — and this is the important bit, don't skip it — specializing this trait affects the ABI of the unordered containers, so use it carefully. Like, carefully carefully. This isn't a "yolo, ship it" situation, it's a "read the room and maybe the ABI docs" situation. 💀 Use it carefully!!

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🎀 Author 🎀

Generated automatically by Doxygen for libstdc++ from the source code. Not a human typing this out by hand, just the machine doing its lil' thing. 🤖💜

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and that's the whole page bestie — this one came to you straight from libstdc++, the manual page std::__is_...h< _Hash >(3), no date attached, just pure library-function-manual goodness 🦋 mwah, go forth and specialize responsibly 💖✨