diff options
Diffstat (limited to 'src/ContractionState.cxx')
| -rw-r--r-- | src/ContractionState.cxx | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ContractionState.cxx b/src/ContractionState.cxx index af1c88bb7..551879c0c 100644 --- a/src/ContractionState.cxx +++ b/src/ContractionState.cxx @@ -12,6 +12,7 @@ #include <stdexcept> #include <string_view> #include <vector> +#include <optional> #include <algorithm> #include <memory> |