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-rw-r--r--utility/stream_support.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/utility/stream_support.hpp b/utility/stream_support.hpp
index 7e070b0..d40313d 100644
--- a/utility/stream_support.hpp
+++ b/utility/stream_support.hpp
@@ -30,7 +30,7 @@ namespace std {
return s;
}
- std::ostream &
+ inline std::ostream &
operator<<(std::ostream & s, const Arc & arc)
{
return s << arc.first << " ↺ " << arc.second;