From e4fcf82f70518e29061df51e9e9108a72fe117a0 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Tue, 6 Jun 2023 13:21:30 +0300
Subject: [PATCH] Support fmap over a tuple

---
 libs/util/include/psemek/util/fmap.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libs/util/include/psemek/util/fmap.hpp b/libs/util/include/psemek/util/fmap.hpp
index ba26114b..10396f8f 100644
--- a/libs/util/include/psemek/util/fmap.hpp
+++ b/libs/util/include/psemek/util/fmap.hpp
@@ -3,6 +3,7 @@
 #include <psemek/util/range.hpp>
 
 #include <optional>
+#include <tuple>
 
 namespace psemek::util
 {
@@ -25,6 +26,16 @@ namespace psemek::util
 				else
 					return std::optional<R>();
 			}
+
+			template <typename ... Ts>
+			auto operator()(std::tuple<Ts...> && x)
+			{
+				return [&]<std::size_t ... I>(std::index_sequence<I...>){
+					return std::tuple{
+						f(std::get<I>(x))...
+					};
+				}(std::make_index_sequence<sizeof...(Ts)>{});
+			}
 		};
 
 	}