Move to clang-format-16 (#908)

Fixes #848

.githooks/pre-commit

@@ -4,7 +4,21 @@ exec 1>&2
 
 # paths to check and re-format
 sources="src unittests"
-formatter="clang-format-11 -i"
+formatter="clang-format -i"
+version=$($formatter --version | awk -F'[[:space:]]' '{print $4}')
+
+if [[ "16.0.0" > "$version" ]]; then
+    cat <<\EOF
+
+                                    ERROR
+-----------------------------------------------------------------------------
+            A minimum of version 16 of `clang-format` is required. 
+            Please fix paths and run again. 
+-----------------------------------------------------------------------------
+
+EOF
+    exit 2
+fi
 
 first=$(git diff $sources)
 find $sources -type f \( -name '*.cpp' -o -name '*.h' -o -name '*.ipp' \) -print0 | xargs -0 $formatter