[Libreoffice-commits] core.git: include/o3tl o3tl/qa

[Tomaž Vajngerl (via logerrit)]

 include/o3tl/hash_combine.hxx |   29 +++++++++++++++++++++++++++++
 o3tl/qa/test-lru_map.cxx      |    6 +++---
 2 files changed, 32 insertions(+), 3 deletions(-)

New commits:
commit e6c0c282be59a5198932604d6c40de837b7cb548
Author:     Tomaž Vajngerl <tomaz.vajngerl at collabora.co.uk>
AuthorDate: Wed May 27 12:49:05 2020 +0200
Commit:     Tomaž Vajngerl <quikee at gmail.com>
CommitDate: Tue May 11 12:23:48 2021 +0200

    add o3tl version of hash_combine to not depend on boost for this
    
    Change-Id: I081f8d116ef811baa8aa5de35a6cb51fa4de7d56
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114983
    Tested-by: Tomaž Vajngerl <quikee at gmail.com>
    Reviewed-by: Tomaž Vajngerl <quikee at gmail.com>

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;
     }
 };