build: add libcpp tests (#45)

* Adding libcpp tests

* fix

Author: lemire

.github/workflows/ci.yml

@@ -70,6 +70,21 @@ jobs:
 
       - run: cargo fmt --all -- --check
 
+  libcpp:
+    name: libc++
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows-latest
+          - os: ubuntu-latest
+          - os: macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - run: cargo test --features=libcpp
+
   lint:
     name: Clippy
     runs-on: ubuntu-latest