kstd: extract result helper alias

1 files changed, 35 insertions, 0 deletions

diff --git a/libs/kstd/kstd/result.hpp b/libs/kstd/kstd/result.hpp
new file mode 100644
index 00000000..7b027a8d
--- /dev/null
+++ b/libs/kstd/kstd/result.hpp
@@ -0,0 +1,35 @@
+#ifndef KSTD_RESULT_HPP
+#define KSTD_RESULT_HPP
+
+#include <kstd/system_error.hpp>
+
+#include <expected>
+#include <type_traits>
+#include <utility>
+
+namespace kstd
+{
+
+  template<typename SuccessType>
+  using result = std::expected<SuccessType, error_code>;
+
+  template<typename SuccessType>
+    requires(!std::is_void_v<SuccessType>)
+  constexpr auto inline success(SuccessType && value) -> result<std::remove_cvref_t<SuccessType>>
+  {
+    return result<std::remove_cvref_t<SuccessType>>{std::in_place, std::forward<SuccessType>(value)};
+  }
+
+  constexpr auto inline success() -> result<void>
+  {
+    return result<void>{std::in_place};
+  }
+
+  constexpr auto inline failure(error_code error) -> std::unexpected<error_code>
+  {
+    return std::unexpected(error);
+  }
+
+}  // namespace kstd
+
+#endif
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