Prefer static operator() if available

.github/workflows/bvt-appleclang.yml

@@ -20,7 +20,7 @@ jobs:
 
     - name: build and run test with AppleClang
       run: |
-        cmake -B build -DCMAKE_BUILD_TYPE=Release
+        cmake -B build -DCMAKE_CXX_STANDARD=23 -DCMAKE_BUILD_TYPE=Release
         cmake --build build -j
         ctest --test-dir build -j
 

.github/workflows/bvt-clang.yml

@@ -15,39 +15,25 @@ jobs:
 
     - name: install clang
       run: |
-        sudo apt install -y clang-16 clang-17 clang-18 libc++-18-dev
+        sudo apt install -y clang-19 libc++-19-dev
 
-    - name: check compiler versions
+    - name: check compiler version
       run: |
-        clang++-16 --version
-        clang++-17 --version
-        clang++-18 --version
+        clang++-19 --version
 
-    - name: build and run test with clang 16
+    - name: build and run test with clang 19
       run: |
-        cmake -B build-clang-16 -DCMAKE_C_COMPILER=clang-16 -DCMAKE_CXX_COMPILER=clang++-16 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-clang-16 -j
-        ctest --test-dir build-clang-16 -j
-
-    - name: build and run test with clang 17
-      run: |
-        cmake -B build-clang-17 -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-clang-17 -j
-        ctest --test-dir build-clang-17 -j
-
-    - name: build and run test with clang 18
-      run: |
-        cmake -B build-clang-18 -DCMAKE_C_COMPILER=clang-18 -DCMAKE_CXX_COMPILER=clang++-18 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-clang-18 -j
-        ctest --test-dir build-clang-18 -j
+        cmake -B build -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_CXX_STANDARD=23 -DCMAKE_BUILD_TYPE=Release
+        cmake --build build -j
+        ctest --test-dir build -j
 
     - name: run benchmarks
       run: |
-        cd build-clang-18/benchmarks
+        cd build/benchmarks
         ./msft_proxy_benchmarks --benchmark_min_warmup_time=0.1 --benchmark_min_time=0.1s --benchmark_repetitions=30 --benchmark_enable_random_interleaving=true --benchmark_report_aggregates_only=true --benchmark_format=json > benchmarking-results.json
 
     - name: archive benchmarking results
       uses: actions/upload-artifact@v4
       with:
         name: benchmarking-results-clang
-        path: build-clang-18/benchmarks/benchmarking-results.json
+        path: build/benchmarks/benchmarking-results.json

.github/workflows/bvt-compatibility.yml

@@ -0,0 +1,64 @@
+on:
+  workflow_call:
+    inputs:
+      branch:
+        type: string
+        required: false
+
+jobs:
+  bvt-compatibility:
+    runs-on: ubuntu-24.04
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ inputs.branch }}
+
+    - name: install compilers
+      run: |
+        sudo apt install -y gcc-13 g++-13 gcc-14 g++-14 clang-16 clang-17 clang-18 clang-19 libc++-19-dev
+
+    - name: check compiler versions
+      run: |
+        g++-13 --version
+        g++-14 --version
+        clang++-16 --version
+        clang++-17 --version
+        clang++-18 --version
+        clang++-19 --version
+
+    - name: build and run test with gcc 13
+      run: |
+        cmake -B build-gcc-13 -DCMAKE_C_COMPILER=gcc-13 -DCMAKE_CXX_COMPILER=g++-13 -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-gcc-13 -j
+        ctest --test-dir build-gcc-13 -j
+
+    - name: build and run test with gcc 14
+      run: |
+        cmake -B build-gcc-14 -DCMAKE_C_COMPILER=gcc-14 -DCMAKE_CXX_COMPILER=g++-14 -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-gcc-14 -j
+        ctest --test-dir build-gcc-14 -j
+
+    # Note that libc++ in Clang 19 is not compatible with Clang 16. Therefore, we fallback to libstdc++.
+    - name: build and run test with clang 16
+      run: |
+        cmake -B build-clang-16 -DCMAKE_C_COMPILER=clang-16 -DCMAKE_CXX_COMPILER=clang++-16 -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-clang-16 -j
+        ctest --test-dir build-clang-16 -j
+
+    - name: build and run test with clang 17
+      run: |
+        cmake -B build-clang-17 -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-clang-17 -j
+        ctest --test-dir build-clang-17 -j
+
+    - name: build and run test with clang 18
+      run: |
+        cmake -B build-clang-18 -DCMAKE_C_COMPILER=clang-18 -DCMAKE_CXX_COMPILER=clang++-18 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-clang-18 -j
+        ctest --test-dir build-clang-18 -j
+
+    - name: build and run test with clang 19
+      run: |
+        cmake -B build-clang-19 -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_BUILD_TYPE=Release
+        cmake --build build-clang-19 -j
+        ctest --test-dir build-clang-19 -j

.github/workflows/bvt-gcc.yml

@@ -15,32 +15,25 @@ jobs:
 
     - name: install gcc
       run: |
-        sudo apt install -y gcc-13 g++-13 gcc-14 g++-14
+        sudo apt install -y gcc-14 g++-14
 
-    - name: check compiler versions
+    - name: check compiler version
       run: |
-        g++-13 --version
         g++-14 --version
 
-    - name: build and run test with gcc 13
-      run: |
-        cmake -B build-gcc-13 -DCMAKE_C_COMPILER=gcc-13 -DCMAKE_CXX_COMPILER=g++-13 -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-gcc-13 -j
-        ctest --test-dir build-gcc-13 -j
-
     - name: build and run test with gcc 14
       run: |
-        cmake -B build-gcc-14 -DCMAKE_C_COMPILER=gcc-14 -DCMAKE_CXX_COMPILER=g++-14 -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-gcc-14 -j
-        ctest --test-dir build-gcc-14 -j
+        cmake -B build -DCMAKE_C_COMPILER=gcc-14 -DCMAKE_CXX_COMPILER=g++-14 -DCMAKE_CXX_STANDARD=23 -DCMAKE_BUILD_TYPE=Release
+        cmake --build build -j
+        ctest --test-dir build -j
 
     - name: run benchmarks
       run: |
-        cd build-gcc-14/benchmarks
+        cd build/benchmarks
         ./msft_proxy_benchmarks --benchmark_min_warmup_time=0.1 --benchmark_min_time=0.1s --benchmark_repetitions=30 --benchmark_enable_random_interleaving=true --benchmark_report_aggregates_only=true --benchmark_format=json > benchmarking-results.json
 
     - name: archive benchmarking results
       uses: actions/upload-artifact@v4
       with:
         name: benchmarking-results-gcc
-        path: build-gcc-14/benchmarks/benchmarking-results.json
+        path: build/benchmarks/benchmarking-results.json

.github/workflows/bvt-msvc.yml

@@ -7,15 +7,15 @@ on:
 
 jobs:
   bvt-msvc:
-    runs-on: windows-2022
+    runs-on: windows-2025
     steps:
     - uses: actions/checkout@v4
       with:
         ref: ${{ inputs.branch }}
 
     - name: build and run test with MSVC
       run: |
-        cmake -B build
+        cmake -B build -DCMAKE_CXX_STANDARD=23
         cmake --build build --config Release -j
         ctest --test-dir build -j
 

.github/workflows/bvt-nvhpc.yml

@@ -23,17 +23,17 @@ jobs:
     - name: build and run test with NVHPC 24.9
       run: |
         PATH=/opt/nvidia/hpc_sdk/Linux_x86_64/24.9/compilers/bin:$PATH; export PATH
-        cmake -B build-nv -DCMAKE_C_COMPILER=nvc -DCMAKE_CXX_COMPILER=nvc++ -DCMAKE_BUILD_TYPE=Release
-        cmake --build build-nv -j
-        ctest --test-dir build-nv -j
+        cmake -B build -DCMAKE_C_COMPILER=nvc -DCMAKE_CXX_COMPILER=nvc++ -DCMAKE_BUILD_TYPE=Release
+        cmake --build build -j
+        ctest --test-dir build -j
 
     - name: run benchmarks
       run: |
-        cd build-nv/benchmarks
+        cd build/benchmarks
         ./msft_proxy_benchmarks --benchmark_min_warmup_time=0.1 --benchmark_min_time=0.1s --benchmark_repetitions=30 --benchmark_enable_random_interleaving=true --benchmark_report_aggregates_only=true --benchmark_format=json > benchmarking-results.json
 
     - name: archive benchmarking results
       uses: actions/upload-artifact@v4
       with:
         name: benchmarking-results-nvhpc
-        path: build-nv/benchmarks/benchmarking-results.json
+        path: build/benchmarks/benchmarking-results.json

.github/workflows/pipeline-ci.yml

@@ -28,6 +28,10 @@ jobs:
     uses: ./.github/workflows/bvt-nvhpc.yml
     name: Run BVT with NVHPC
 
+  run-bvt-compatibility:
+    uses: ./.github/workflows/bvt-compatibility.yml
+    name: Run BVT for compatibility
+
   report:
     uses: ./.github/workflows/bvt-report.yml
     name: Generate report

benchmarks/CMakeLists.txt

@@ -26,6 +26,8 @@ target_link_libraries(msft_proxy_benchmarks PRIVATE msft_proxy benchmark::benchm
 
 if (MSVC)
   target_compile_options(msft_proxy_benchmarks PRIVATE /W4)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  target_compile_options(msft_proxy_benchmarks PRIVATE -Wall -Wextra -Wpedantic -Wno-c++2b-extensions)
 else()
   target_compile_options(msft_proxy_benchmarks PRIVATE -Wall -Wextra -Wpedantic)
 endif()