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-rw-r--r--src/libstore/store-api.hh6
1 files changed, 2 insertions, 4 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index ea259f07e8ab..6ee2d550679b 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -355,14 +355,12 @@ public:
 
     /* Asynchronous version of queryPathInfo(). */
     void queryPathInfo(const Path & path,
-        std::function<void(ref<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure);
+        Callback<ref<ValidPathInfo>> callback);
 
 protected:
 
     virtual void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) = 0;
+        Callback<std::shared_ptr<ValidPathInfo>> callback) = 0;
 
 public: