llvm 18 update (#59)

Update vcpkg

.github/workflows/build.yml

@@ -53,10 +53,10 @@ jobs:
         run: |
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
-          sudo ./llvm.sh 17
-          sudo apt install libc++-17-dev
-          echo "CC=clang-17" >> $GITHUB_ENV
-          echo "CXX=clang++-17" >> $GITHUB_ENV
+          sudo ./llvm.sh 18
+          sudo apt install libc++-18-dev
+          echo "CC=clang-18" >> $GITHUB_ENV
+          echo "CXX=clang++-18" >> $GITHUB_ENV
         shell: bash
         if: matrix.platform == 'ubuntu-latest' && matrix.compiler == 'llvm'
 

src/ftrees.h

@@ -141,9 +141,6 @@ class FTrees {
       : ftrees_(CreateFTreeArray(std::move(block), std::make_index_sequence<kSizeBuckets.size()>{})) {}
 
   size_t size() const {
-    // TODO: llvm fold support
-    // return *std::ranges::fold_right_last(
-    // ftrees_ | std::views::transform([](const FTree& ftree) { return ftree.size(); }), std::plus<>());
     return std::accumulate(ftrees_.begin(), ftrees_.end(), size_t{0},
                            [](auto acc, const FTree& ftree) { return acc + ftree.size(); });
   }