Use std::byte* instead of void* for allocators.

1 files changed, 11 insertions, 1 deletions

diff --git a/include/fud_drain.hpp b/include/fud_drain.hpp
index 5b78b10..d630bc7 100644
--- a/include/fud_drain.hpp
+++ b/include/fud_drain.hpp
@@ -26,8 +26,18 @@
 namespace fud {
 
 struct DrainResult {
-    size_t bytesWritten;
+    size_t bytesDrained;
     FudStatus status;
+    [[nodiscard]] constexpr bool isOkay()
+    {
+        return status == FudStatus::Success;
+    }
+};
+
+template <typename Sink, typename Source>
+concept Drainable = requires (Sink sink, Source source)
+{
+    { sink.drain(source) } -> std::same_as<DrainResult>;
 };
 
 } // namespace fud