From e6f0464651ff52f3f4243352b4382625076bdc8c Mon Sep 17 00:00:00 2001
From: Kefu Chai <tchaikov@gmail.com>
Date: Wed, 2 Mar 2022 00:06:07 +0800
Subject: [PATCH] crimson/common/interruptible_future: ensure
 seastar::AllAreFutures<> is happy

if compiled with C++20, C++ concept is enabled. to ensure the
constraints required by when_all_impl() is fulfilled, we need to
specialize is_tuple_of_futures<> for interruptible_future.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>
---
 src/crimson/common/interruptible_future.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/crimson/common/interruptible_future.h b/src/crimson/common/interruptible_future.h
index f5b73a35cf654..d7f09b6dfa086 100644
--- a/src/crimson/common/interruptible_future.h
+++ b/src/crimson/common/interruptible_future.h
@@ -64,6 +64,18 @@ namespace seastar::internal {
   {};
 }
 
+SEASTAR_CONCEPT(
+namespace crimson::interruptible {
+  template<typename InterruptCond, typename FutureType>
+  class interruptible_future_detail;
+}
+namespace seastar::impl {
+  template <typename InterruptCond, typename FutureType, typename... Rest>
+  struct is_tuple_of_futures<std::tuple<crimson::interruptible::interruptible_future_detail<InterruptCond, FutureType>, Rest...>>
+    : is_tuple_of_futures<std::tuple<Rest...>> {};
+}
+)
+
 namespace crimson::interruptible {
 
 struct ready_future_marker {};
-- 
2.39.5