Get rid of std::shared_ptr<std::string> and ref<std::string>

These were needed back in the pre-C++11 era because we didn't have
move semantics. But now we do.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/binary-cache-store.hh
index 9815af591..46ff67c77 100644
--- a/src/libstore/binary-cache-store.hh
+++ b/src/libstore/binary-cache-store.hh
@@ -62,10 +62,11 @@ public:
 
     /* Fetch the specified file and call the specified callback with
        the result. A subclass may implement this asynchronously. */
-    virtual void getFile(const std::string & path,
-        Callback<std::shared_ptr<std::string>> callback) noexcept;
+    virtual void getFile(
+        const std::string & path,
+        Callback<std::optional<std::string>> callback) noexcept;
 
-    std::shared_ptr<std::string> getFile(const std::string & path);
+    std::optional<std::string> getFile(const std::string & path);
 
 public:
 
@@ -117,7 +118,7 @@ public:
 
     void addSignatures(const StorePath & storePath, const StringSet & sigs) override;
 
-    std::shared_ptr<std::string> getBuildLog(const StorePath & path) override;
+    std::optional<std::string> getBuildLog(const StorePath & path) override;
 
 };