From 0eada2ae939a023cc53c2cb45c1d3a48bc5bda22 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Mon, 30 May 2022 02:26:12 +0300
Subject: [PATCH] Revert hash_combine for floats

---
 include/boost/container_hash/hash.hpp | 12 ++++++------
 test/hash_complex_test.cpp            |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/boost/container_hash/hash.hpp b/include/boost/container_hash/hash.hpp
index eeaca31..7c6223d 100644
--- a/include/boost/container_hash/hash.hpp
+++ b/include/boost/container_hash/hash.hpp
@@ -204,8 +204,8 @@ namespace boost
 
                 std::size_t seed = 0;
 
-                boost::hash_combine( seed, w[ 0 ] );
-                boost::hash_combine( seed, w[ 1 ] );
+                seed ^= static_cast<std::size_t>( w[0] ) + ( seed << 6 ) + ( seed >> 2 );
+                seed ^= static_cast<std::size_t>( w[1] ) + ( seed << 6 ) + ( seed >> 2 );
 
                 return seed;
             }
@@ -221,8 +221,8 @@ namespace boost
 
                 std::size_t seed = 0;
 
-                boost::hash_combine( seed, w[ 0 ] );
-                boost::hash_combine( seed, w[ 1 ] );
+                seed ^= static_cast<std::size_t>( w[0] ) + ( seed << 6 ) + ( seed >> 2 );
+                seed ^= static_cast<std::size_t>( w[1] ) + ( seed << 6 ) + ( seed >> 2 );
 
                 return seed;
             }
@@ -238,8 +238,8 @@ namespace boost
 
                 std::size_t seed = 0;
 
-                boost::hash_combine( seed, w[ 0 ] );
-                boost::hash_combine( seed, w[ 1 ] );
+                seed ^= static_cast<std::size_t>( w[0] ) + ( seed << 6 ) + ( seed >> 2 );
+                seed ^= static_cast<std::size_t>( w[1] ) + ( seed << 6 ) + ( seed >> 2 );
 
                 return seed;
             }
diff --git a/test/hash_complex_test.cpp b/test/hash_complex_test.cpp
index 2435ab4..73f43de 100644
--- a/test/hash_complex_test.cpp
+++ b/test/hash_complex_test.cpp
@@ -123,7 +123,7 @@ int main()
     complex_grid_test<int>( 16 );
     complex_grid_test<float>( 7 );
     complex_grid_test<double>( 16 );
-    complex_grid_test<long double>( 16 );
+    complex_grid_test<long double>( 15 );
 
     return boost::report_errors();
 }