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Diffstat (limited to 'third_party/abseil_cpp/absl/hash/internal/city.h')
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city.h | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/third_party/abseil_cpp/absl/hash/internal/city.h b/third_party/abseil_cpp/absl/hash/internal/city.h deleted file mode 100644 index 393da0b95d9f..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city.h +++ /dev/null @@ -1,78 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// https://code.google.com/p/cityhash/ -// -// This file provides a few functions for hashing strings. All of them are -// high-quality functions in the sense that they pass standard tests such -// as Austin Appleby's SMHasher. They are also fast. -// -// For 64-bit x86 code, on short strings, we don't know of anything faster than -// CityHash64 that is of comparable quality. We believe our nearest competitor -// is Murmur3. For 64-bit x86 code, CityHash64 is an excellent choice for hash -// tables and most other hashing (excluding cryptography). -// -// For 32-bit x86 code, we don't know of anything faster than CityHash32 that -// is of comparable quality. We believe our nearest competitor is Murmur3A. -// (On 64-bit CPUs, it is typically faster to use the other CityHash variants.) -// -// Functions in the CityHash family are not suitable for cryptography. -// -// Please see CityHash's README file for more details on our performance -// measurements and so on. -// -// WARNING: This code has been only lightly tested on big-endian platforms! -// It is known to work well on little-endian platforms that have a small penalty -// for unaligned reads, such as current Intel and AMD moderate-to-high-end CPUs. -// It should work on all 32-bit and 64-bit platforms that allow unaligned reads; -// bug reports are welcome. -// -// By the way, for some hash functions, given strings a and b, the hash -// of a+b is easily derived from the hashes of a and b. This property -// doesn't hold for any hash functions in this file. - -#ifndef ABSL_HASH_INTERNAL_CITY_H_ -#define ABSL_HASH_INTERNAL_CITY_H_ - -#include <stdint.h> -#include <stdlib.h> // for size_t. - -#include <utility> - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -// 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. Most useful in 32-bit binaries. -uint32_t CityHash32(const char *s, size_t len); - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_INTERNAL_CITY_H_ |