Performance: Replace string by special single-copy YulString class.

1 files changed, 2 insertions, 2 deletions

diff --git a/libyul/optimiser/VarDeclPropagator.h b/libyul/optimiser/VarDeclPropagator.h
index 8cba8649..4522d23a 100644
--- a/libyul/optimiser/VarDeclPropagator.h
+++ b/libyul/optimiser/VarDeclPropagator.h
@@ -53,10 +53,10 @@ private:
 
 private:
 	/// Holds a list of variables from current Block that have no value assigned yet.
-	std::map<std::string, TypedName> m_emptyVarDecls;
+	std::map<YulString, TypedName> m_emptyVarDecls;
 
 	/// Holds a list variables (and their TypedName) within the current block.
-	std::map<std::string, TypedName> m_lazyInitializedVarDecls;
+	std::map<YulString, TypedName> m_lazyInitializedVarDecls;
 };
 
 }