From 51d8d16114a99aa95dd95664a4ea13a93bad69fd Mon Sep 17 00:00:00 2001
From: Teon Banek <teon.banek@memgraph.io>
Date: Mon, 9 Sep 2019 15:07:52 +0200
Subject: [PATCH] Add utils::BasicResult specialization for `void`

Reviewers: mferencevic, ipaljak

Reviewed By: mferencevic

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D2365
---
 src/utils/result.hpp | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/utils/result.hpp b/src/utils/result.hpp
index 375407ece..e7316388c 100644
--- a/src/utils/result.hpp
+++ b/src/utils/result.hpp
@@ -93,4 +93,37 @@ class [[nodiscard]] BasicResult final {
   std::optional<TError> error_;
 };
 
+template <class TError>
+class [[nodiscard]] BasicResult<TError, void> final {
+ public:
+  BasicResult() = default;
+  BasicResult(const TError &error) : error_(error) {}
+  BasicResult(TError &&error) noexcept : error_(std::move(error)) {}
+
+  bool HasError() const { return error_.has_value(); }
+
+  TError &GetError() & {
+    CHECK(error_) << "The storage result is a value!";
+    return *error_;
+  }
+
+  TError &&GetError() && {
+    CHECK(error_) << "The storage result is a value!";
+    return std::move(*error_);
+  }
+
+  const TError &GetError() const & {
+    CHECK(error_) << "The storage result is a value!";
+    return *error_;
+  }
+
+  const TError &&GetError() const && {
+    CHECK(error_) << "The storage result is a value!";
+    return std::move(*error_);
+  }
+
+ private:
+  std::optional<TError> error_;
+};
+
 }  // namespace utils