diff options
| -rw-r--r-- | include/o3tl/hash_combine.hxx | 29 | ||||
| -rw-r--r-- | o3tl/qa/test-lru_map.cxx | 6 |
2 files changed, 32 insertions, 3 deletions
diff --git a/include/o3tl/hash_combine.hxx b/include/o3tl/hash_combine.hxx new file mode 100644 index 000000000000..17419b3e2c0f --- /dev/null +++ b/include/o3tl/hash_combine.hxx @@ -0,0 +1,29 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#pragma once + +namespace o3tl +{ +template <typename T, typename N, std::enable_if_t<(sizeof(N) == 4), bool> = false> +inline void hash_combine(N& nSeed, T const& nValue) +{ + static_assert(sizeof(nSeed) == 4); + nSeed ^= std::hash<T>{}(nValue) + 0x9E3779B9u + (nSeed << 6) + (nSeed >> 2); +} + +template <typename T, typename N, std::enable_if_t<(sizeof(N) == 8), bool> = false> +inline void hash_combine(N& nSeed, T const& nValue) +{ + static_assert(sizeof(nSeed) == 8); + nSeed ^= std::hash<T>{}(nValue) + 0x9E3779B97F4A7C15llu + (nSeed << 12) + (nSeed >> 4); +} +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ diff --git a/o3tl/qa/test-lru_map.cxx b/o3tl/qa/test-lru_map.cxx index ba9ee71835ce..ef46f44d17b9 100644 --- a/o3tl/qa/test-lru_map.cxx +++ b/o3tl/qa/test-lru_map.cxx @@ -15,7 +15,7 @@ #include <o3tl/lru_map.hxx> -#include <boost/functional/hash.hpp> +#include <o3tl/hash_combine.hxx> using namespace ::o3tl; @@ -202,8 +202,8 @@ struct TestClassKeyHashFunction std::size_t operator()(TestClassKey const& aKey) const { std::size_t seed = 0; - boost::hash_combine(seed, aKey.mA); - boost::hash_combine(seed, aKey.mB); + o3tl::hash_combine(seed, aKey.mA); + o3tl::hash_combine(seed, aKey.mB); return seed; } }; |