Fix regression in GCC 11

.github/workflows/bvt-clang.yml

@@ -0,0 +1,75 @@
+on:
+  workflow_call:
+    inputs:
+      branch:
+        type: string
+        required: false
+
+jobs:
+  bvt-clang:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ inputs.branch }}
+
+    - name: install clang
+      run: |
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main" -y
+        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main" -y
+        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main" -y
+        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main" -y
+        sudo apt update
+        sudo apt install -y clang-15 clang-16 clang-17 clang-18
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/clang-15 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/clang++-15 1
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/clang-16 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/clang++-16 1
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/clang-17 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/clang++-17 1
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/clang-18 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/clang++-18 1
+
+    - name: check compiler versions
+      run: |
+        clang++-15 --version
+        clang++-16 --version
+        clang++-17 --version
+        clang++-18 --version
+
+    - name: build and run test with clang 15
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/clang-15
+        sudo update-alternatives --set g++ /usr/bin/clang++-15
+        cmake . -B build-clang-15
+        cmake --build ./build-clang-15 -j8
+        cd ./build-clang-15
+        ctest -j8
+
+    - name: build and run test with clang 16
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/clang-16
+        sudo update-alternatives --set g++ /usr/bin/clang++-16
+        cmake . -B build-clang-16
+        cmake --build ./build-clang-16 -j8
+        cd ./build-clang-16
+        ctest -j8
+
+    - name: build and run test with clang 17
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/clang-17
+        sudo update-alternatives --set g++ /usr/bin/clang++-17
+        cmake . -B build-clang-17
+        cmake --build ./build-clang-17 -j8
+        cd ./build-clang-17
+        ctest -j8
+
+    - name: build and run test with clang 18
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/clang-18
+        sudo update-alternatives --set g++ /usr/bin/clang++-18
+        cmake . -B build-clang-18
+        cmake --build ./build-clang-18 -j8
+        cd ./build-clang-18
+        ctest -j8

.github/workflows/bvt-gcc.yml

@@ -0,0 +1,58 @@
+on:
+  workflow_call:
+    inputs:
+      branch:
+        type: string
+        required: false
+
+jobs:
+  bvt-gcc:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ inputs.branch }}
+
+    - name: install gcc
+      run: |
+        sudo apt update
+        sudo apt install -y gcc-11 g++-11 gcc-12 g++-12 gcc-13 g++-13
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-11 1
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 1
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 1
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 1
+
+    - name: check compiler versions
+      run: |
+        g++-11 --version
+        g++-12 --version
+        g++-13 --version
+
+    - name: build and run test with gcc 11
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/gcc-11
+        sudo update-alternatives --set g++ /usr/bin/g++-11
+        cmake . -B build-gcc-11
+        cmake --build ./build-gcc-11 -j8
+        cd ./build-gcc-11
+        ctest -j8
+
+    - name: build and run test with gcc 12
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/gcc-12
+        sudo update-alternatives --set g++ /usr/bin/g++-12
+        cmake . -B build-gcc-12
+        cmake --build ./build-gcc-12 -j8
+        cd ./build-gcc-12
+        ctest -j8
+
+    - name: build and run test with gcc 13
+      run: |
+        sudo update-alternatives --set gcc /usr/bin/gcc-13
+        sudo update-alternatives --set g++ /usr/bin/g++-13
+        cmake . -B build-gcc-13
+        cmake --build ./build-gcc-13 -j8
+        cd ./build-gcc-13
+        ctest -j8

.github/workflows/bvt-msvc14.yml → .github/workflows/bvt-msvc.yml

@@ -6,7 +6,7 @@ on:
         required: false
 
 jobs:
-  bvt-msvc14:
+  bvt-msvc:
     runs-on: windows-2022
     steps:
     - uses: actions/checkout@v3

.github/workflows/pipeline-ci.yml

@@ -11,14 +11,14 @@ env:
   BUILD_TYPE: Release
 
 jobs:
-  run-bvt-gcc13:
-    uses: ./.github/workflows/bvt-gcc13.yml
-    name: run bvt with g++ 13
+  run-bvt-gcc:
+    uses: ./.github/workflows/bvt-gcc.yml
+    name: run bvt with g++
 
-  run-bvt-clang15:
-    uses: ./.github/workflows/bvt-clang15.yml
-    name: run bvt with clang 15
+  run-bvt-clang:
+    uses: ./.github/workflows/bvt-clang.yml
+    name: run bvt with clang
 
-  run-bvt-msvc14:
-    uses: ./.github/workflows/bvt-msvc14.yml
-    name: run bvt with msvc14 (vs2022)
+  run-bvt-msvc:
+    uses: ./.github/workflows/bvt-msvc.yml
+    name: run bvt with msvc

.github/workflows/pipeline-release.yml

@@ -37,30 +37,30 @@ jobs:
         git push origin release/${{ github.event.inputs.version }}
         git push origin ${{ github.event.inputs.version }}
 
-  run-bvt-gcc13:
+  run-bvt-gcc:
     needs: prepare-release
-    name: run bvt with g++ 13
-    uses: ./.github/workflows/bvt-gcc13.yml
+    name: run bvt with g++
+    uses: ./.github/workflows/bvt-gcc.yml
     with:
       branch: release/${{ github.event.inputs.version }}
 
-  run-bvt-clang15:
+  run-bvt-clang:
     needs: prepare-release
-    name: run bvt with clang 15
-    uses: ./.github/workflows/bvt-clang15.yml
+    name: run bvt with clang
+    uses: ./.github/workflows/bvt-clang.yml
     with:
       branch: release/${{ github.event.inputs.version }}
 
-  run-bvt-msvc14:
+  run-bvt-msvc:
     needs: prepare-release
-    name: run bvt with msvc14 (vs2022)
-    uses: ./.github/workflows/bvt-msvc14.yml
+    name: run bvt with msvc
+    uses: ./.github/workflows/bvt-msvc.yml
     with:
       branch: release/${{ github.event.inputs.version }}
 
   draft-release:
     runs-on: windows-latest
-    needs: [run-bvt-gcc11, run-bvt-clang14, run-bvt-msvc14]
+    needs: [run-bvt-gcc, run-bvt-clang, run-bvt-msvc]
     steps:
     - uses: actions/checkout@v3
       with:

proxy.h

@@ -52,14 +52,16 @@ template <class Expr>
 consteval bool is_consteval(Expr)
     { return requires { typename std::bool_constant<(Expr{}(), false)>; }; }
 
+template <class T, std::size_t I>
+concept has_tuple_element = requires { typename std::tuple_element_t<I, T>; };
 template <class T>
 consteval bool is_tuple_like_well_formed() {
   if constexpr (requires { { std::tuple_size<T>::value } ->
       std::same_as<const std::size_t&>; }) {
     if constexpr (is_consteval([] { return std::tuple_size<T>::value; })) {
       return []<std::size_t... I>(std::index_sequence<I...>) {
-            return (requires { typename std::tuple_element_t<I, T>; } && ...);
-          }(std::make_index_sequence<std::tuple_size_v<T>>{});
+        return (has_tuple_element<T, I> && ...);
+      }(std::make_index_sequence<std::tuple_size_v<T>>{});
     }
   }
   return false;