From a141c401f78467bc15f62882fca5d55a007cacbb Mon Sep 17 00:00:00 2001
From: Steven Le Rouzic <steven.lerouzic@gmail.com>
Date: Mon, 17 Feb 2025 00:21:48 +0100
Subject: Reorganize everything

---
 asl/hash.hpp | 138 -----------------------------------------------------------
 1 file changed, 138 deletions(-)
 delete mode 100644 asl/hash.hpp

(limited to 'asl/hash.hpp')

diff --git a/asl/hash.hpp b/asl/hash.hpp
deleted file mode 100644
index 9539755..0000000
--- a/asl/hash.hpp
+++ /dev/null
@@ -1,138 +0,0 @@
-#pragma once
-
-#include "asl/integers.hpp"
-#include "asl/meta.hpp"
-#include "asl/span.hpp"
-#include "asl/utility.hpp"
-
-namespace asl::city_hash
-{
-
-// Hash function for a byte array.
-uint64_t CityHash64(const char *s, size_t len);
-
-// Hash function for a byte array.  For convenience, a 64-bit seed is also
-// hashed into the result.
-uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed);
-
-// Hash function for a byte array.  For convenience, two seeds are also
-// hashed into the result.
-uint64_t CityHash64WithSeeds(const char *s, size_t len,
-                           uint64_t seed0, uint64_t seed1);
-
-// Hash function for a byte array.
-uint128_t CityHash128(const char *s, size_t len);
-
-// Hash function for a byte array.  For convenience, a 128-bit seed is also
-// hashed into the result.
-uint128_t CityHash128WithSeed(const char *s, size_t len, uint128_t seed);
-
-// Hash function for a byte array.  Most useful in 32-bit binaries.
-uint32_t CityHash32(const char *s, size_t len);
-
-// Hash 128 input bits down to 64 bits of output.
-// This is intended to be a reasonably good hash function.
-constexpr uint64_t Hash128to64(uint64_t high, uint64_t low)
-{
-  // Murmur-inspired hashing.
-  const uint64_t kMul = 0x9ddfea08eb382d69ULL;
-  uint64_t a = (low ^ high) * kMul;
-  a ^= (a >> 47);
-  uint64_t b = (high ^ a) * kMul;
-  b ^= (b >> 47);
-  b *= kMul;
-  return b;
-}
-
-// Hash 128 input bits down to 64 bits of output.
-// This is intended to be a reasonably good hash function.
-constexpr uint64_t Hash128to64(const uint128_t& x)
-{
-  return Hash128to64(x.high, x.low);
-}
-
-} // namespace asl::city_hash
-
-namespace asl
-{
-
-template<typename T, typename H>
-concept hashable_generic = requires(const T& value, H h)
-{
-    { AslHashValue(h, value) } -> same_as<H>;
-};
-
-struct HashState
-{
-    uint128_t state{};
-
-    constexpr HashState() = default;
-    explicit constexpr HashState(uint128_t s) : state{s} {}
-
-    template<typename T>
-    static HashState combine_contiguous(HashState h, span<const T> s)
-    {
-        if constexpr (uniquely_represented<T>)
-        {
-            auto bytes = as_bytes(s);
-            auto hashed = city_hash::CityHash128WithSeed(
-                reinterpret_cast<const char*>(bytes.data()),
-                static_cast<size_t>(bytes.size()),
-                h.state);
-            return HashState{hashed};
-        }
-        else
-        {
-            for (const auto& value: s)
-            {
-                h = AslHashValue(ASL_MOVE(h), value);
-            }
-            return h;
-        }
-    }
-
-    static constexpr HashState combine(HashState h)
-    {
-        return h;
-    }
-
-    template<hashable_generic<HashState> Arg, hashable_generic<HashState>... Remaining>
-    static constexpr HashState combine(HashState h, const Arg& arg, const Remaining&... remaining)
-    {
-        return combine(AslHashValue(ASL_MOVE(h), arg), remaining...);
-    }
-};
-
-template<typename T>
-concept hashable = hashable_generic<T, HashState>;
-
-template<typename H, uniquely_represented T>
-constexpr H AslHashValue(H h, const T& value)
-{
-    return H::combine_contiguous(ASL_MOVE(h), span<const T>{&value, 1});
-}
-
-template<typename H>
-constexpr H AslHashValue(H h, bool value)
-{
-    return AslHashValue(ASL_MOVE(h), value ? 1 : 0);
-}
-
-template<typename H, typename T>
-constexpr void AslHashValue(H h, T*); // Don't hash pointers
-
-template<typename H, hashable T>
-constexpr H AslHashValue(H h, const span<T>& s)
-{
-    return H::combine_contiguous(ASL_MOVE(h), span<const T>{s.data(), s.size()});
-}
-
-template<hashable T>
-constexpr uint64_t hash_value(const T& value)
-{
-    auto result = AslHashValue(HashState{}, value).state;
-    return city_hash::Hash128to64(result);
-}
-
-} // namespace asl
-
-- 
cgit