Update revision history

.drone.jsonnet

@@ -102,7 +102,6 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         "cppalliance/droneubuntu1404:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.7', CXXSTD: '0x', ADDRMD: '32,64' },
         "g++-4.7-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
@@ -112,11 +111,10 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 14.04 GCC 4.9 32/64",
-        "cppalliance/droneubuntu1404:1",
+        "Linux 16.04 GCC 4.9 32/64",
+        "cppalliance/droneubuntu1604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '11', ADDRMD: '32,64' },
         "g++-4.9-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
     ),
 
     linux_pipeline(
@@ -214,19 +212,26 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 25.10 GCC 15 UBSAN",
-        "cppalliance/droneubuntu2510:1",
+        "Linux 26.04 GCC 15 UBSAN",
+        "cppalliance/droneubuntu2604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-15', CXXSTD: '11,14,17,20,23,2c' } + ubsan,
         "g++-15-multilib",
     ),
 
     linux_pipeline(
-        "Linux 25.10 GCC 15 ASAN",
-        "cppalliance/droneubuntu2510:1",
+        "Linux 26.04 GCC 15 ASAN",
+        "cppalliance/droneubuntu2604:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-15', CXXSTD: '11,14,17,20,23,2c' } + asan,
         "g++-15-multilib",
     ),
 
+    linux_pipeline(
+        "Linux 26.04 GCC 16",
+        "cppalliance/droneubuntu2604:1",
+        { TOOLSET: 'gcc', COMPILER: 'g++-16', CXXSTD: '11,14,17,20,23,2c' },
+        "g++-16-multilib",
+    ),
+
     linux_pipeline(
         "Linux 16.04 Clang 3.5",
         "cppalliance/droneubuntu1604:1",
@@ -389,12 +394,19 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 25.10 Clang 21",
-        "cppalliance/droneubuntu2510:1",
+        "Linux 26.04 Clang 21",
+        "cppalliance/droneubuntu2604:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-21', CXXSTD: '11,14,17,20,23,2c' },
         "clang-21",
     ),
 
+    linux_pipeline(
+        "Linux 26.04 Clang 22",
+        "cppalliance/droneubuntu2604:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-22', CXXSTD: '11,14,17,20,23,2c' },
+        "clang-22",
+    ),
+
     macos_pipeline(
         "MacOS 10.15 Xcode 12.2 UBSAN",
         { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,17,2a' } + ubsan,

.github/workflows/ci.yml

@@ -67,10 +67,16 @@ jobs:
             address-model: 32,64
           - toolset: gcc-15
             cxxstd: "11,14,17,20,23,2c"
-            container: ubuntu:25.10
+            container: ubuntu:26.04
             os: ubuntu-latest
             install: g++-15-multilib
             address-model: 32,64
+          - toolset: gcc-16
+            cxxstd: "11,14,17,20,23,2c"
+            container: ubuntu:26.04
+            os: ubuntu-latest
+            install: g++-16-multilib
+            address-model: 32,64
           - toolset: clang
             compiler: clang++-6.0
             cxxstd: "11,14,17"
@@ -164,9 +170,15 @@ jobs:
           - toolset: clang
             compiler: clang++-21
             cxxstd: "11,14,17,20,23,2c"
-            container: ubuntu:25.10
+            container: ubuntu:26.04
             os: ubuntu-latest
             install: clang-21
+          - toolset: clang
+            compiler: clang++-22
+            cxxstd: "11,14,17,20,23,2c"
+            container: ubuntu:26.04
+            os: ubuntu-latest
+            install: clang-22
           - toolset: clang
             cxxstd: "11,14,17,20,2b"
             os: macos-14
@@ -178,12 +190,7 @@ jobs:
             os: macos-26
 
     runs-on: ${{matrix.os}}
-
-    container:
-      image: ${{matrix.container}}
-      volumes:
-        - /node20217:/node20217:rw,rshared
-        - ${{ startsWith(matrix.container, 'ubuntu:1') && '/node20217:/__e/node20:ro,rshared' || ' ' }}
+    container: ${{matrix.container}}
 
     defaults:
       run:
@@ -247,14 +254,18 @@ jobs:
             cxxstd: "14,17,20,latest"
             addrmd: 32,64
             os: windows-2022
+          - toolset: msvc-14.5
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2025-vs2026
           - toolset: clang-win
             cxxstd: "14,17,20,latest"
             addrmd: 32,64
-            os: windows-2022
+            os: windows-2025
           - toolset: gcc
             cxxstd: "11,14,17,2a"
             addrmd: 64
-            os: windows-2022
+            os: windows-2025
 
     runs-on: ${{matrix.os}}
 

doc/hash/recent.adoc

@@ -8,6 +8,10 @@ https://www.boost.org/LICENSE_1_0.txt
 = Recent Changes
 :idprefix: recent_
 
+== Boost 1.92.0
+
+* Hashing a valueless `std::variant` instance no longer throws.
+
 == Boost 1.89.0
 
 * Added the `hash_is_avalanching` trait class.

include/boost/container_hash/hash.hpp

@@ -455,7 +455,11 @@ namespace boost
         std::size_t seed = 0;
 
         hash_combine( seed, v.index() );
-        std::visit( [&seed](auto&& x) { hash_combine(seed, x); }, v );
+
+        if( !v.valueless_by_exception() )
+        {
+            std::visit( [&seed](auto&& x) { hash_combine(seed, x); }, v );
+        }
 
         return seed;
     }

test/Jamfile.v2

@@ -135,3 +135,5 @@ run hash_tuple_like_test2.cpp
 
 run is_range_test4.cpp ;
 run hash_container_test2.cpp ;
+
+run hash_variant_test2.cpp ;

test/hash_variant_test2.cpp

@@ -0,0 +1,58 @@
+// Copyright 2026 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/container_hash/hash.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX17_HDR_VARIANT)
+
+BOOST_PRAGMA_MESSAGE( "Skipping test because BOOST_NO_CXX17_HDR_VARIANT is defined" )
+int main() {}
+
+#elif defined(BOOST_CLANG_VERSION) && BOOST_CLANG_VERSION < 70100
+
+BOOST_PRAGMA_MESSAGE( "Skipping test because BOOST_CLANG_VERSION < 70100" )
+int main() {}
+
+#else
+
+#include <boost/core/lightweight_test.hpp>
+#include <variant>
+#include <set>
+
+struct X
+{
+    operator std::set<float>() const { throw 5; }
+};
+
+using V = std::variant<std::set<int>, std::set<float>>;
+
+V make_valueless_variant()
+{
+    V v;
+
+    try
+    {
+        v.emplace<1>( X() );
+    }
+    catch( int )
+    {
+    }
+
+    BOOST_TEST( v.valueless_by_exception() );
+
+    return v;
+}
+
+int main()
+{
+    V v1, v2 = make_valueless_variant();
+
+    BOOST_TEST_NE( (boost::hash<V>()( v1 )), (boost::hash<V>()( v2 )) );
+
+    return boost::report_errors();
+}
+
+#endif