Fix is_tuple_like for cv-qualified types under old compilers

.github/workflows/ci.yml

@@ -124,24 +124,33 @@ jobs:
           - toolset: clang
             compiler: clang++-13
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-22.04
+            container: ubuntu:22.04
+            os: ubuntu-latest
             install: clang-13
           - toolset: clang
             compiler: clang++-14
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-22.04
+            container: ubuntu:22.04
+            os: ubuntu-latest
             install: clang-14
           - toolset: clang
             compiler: clang++-15
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-22.04
+            container: ubuntu:22.04
+            os: ubuntu-latest
             install: clang-15
           - toolset: clang
             compiler: clang++-16
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-latest
             container: ubuntu:23.04
+            os: ubuntu-latest
             install: clang-16
+          - toolset: clang
+            compiler: clang++-17
+            cxxstd: "11,14,17,20,2b"
+            container: ubuntu:23.10
+            os: ubuntu-latest
+            install: clang-17
           - toolset: clang
             cxxstd: "11,14,17,2a"
             os: macos-11

include/boost/container_hash/is_tuple_like.hpp

@@ -26,7 +26,7 @@ template<class T> struct is_tuple_like_<T, std::integral_constant<bool, std::tup
 namespace container_hash
 {
 
-template<class T> struct is_tuple_like: hash_detail::is_tuple_like_<T>
+template<class T> struct is_tuple_like: hash_detail::is_tuple_like_< typename std::remove_cv<T>::type >
 {
 };
 

test/is_tuple_like_test.cpp

@@ -70,20 +70,36 @@ int main()
     using boost::container_hash::is_tuple_like;
 
     BOOST_TEST_TRAIT_FALSE((is_tuple_like<void>));
+    BOOST_TEST_TRAIT_FALSE((is_tuple_like<void const>));
+
     BOOST_TEST_TRAIT_FALSE((is_tuple_like<int>));
+    BOOST_TEST_TRAIT_FALSE((is_tuple_like<int const>));
+
     BOOST_TEST_TRAIT_FALSE((is_tuple_like<X>));
+    BOOST_TEST_TRAIT_FALSE((is_tuple_like<X const>));
+
     BOOST_TEST_TRAIT_FALSE((is_tuple_like<int[2]>));
+    BOOST_TEST_TRAIT_FALSE((is_tuple_like<int const [2]>));
 
 #if !defined(BOOST_NO_CXX11_HDR_TUPLE) && !BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
 
     BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::pair<int, X> >));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::pair<int, X> const>));
 
     BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<> >));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<> const>));
+
     BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X> >));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X> const>));
+
     BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X, X> >));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X, X> const>));
+
     BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X, X, X> >));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like< std::tuple<X, X, X> const>));
 
     BOOST_TEST_TRAIT_TRUE((is_tuple_like<user::Y>));
+    BOOST_TEST_TRAIT_TRUE((is_tuple_like<user::Y const>));
 
 #endif