From fb1f1c763055abea556959b42a2f1d5e548c1452 Mon Sep 17 00:00:00 2001
From: Patrick Palka <ppalka@redhat.com>
Date: Thu, 19 Dec 2024 11:31:06 -0500
Subject: [PATCH] libstdc++: Define P1206R7 range-key-type and
 range-mapped-type aliases

libstdc++-v3/ChangeLog:

	* include/bits/ranges_base.h (__detail::__range_key_type):
	Define as per P1206R7.
	(__detail::__range_mapped_type): Likewise.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
---
 libstdc++-v3/include/bits/ranges_base.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libstdc++-v3/include/bits/ranges_base.h b/libstdc++-v3/include/bits/ranges_base.h
index a2c743ff56bc..c8cd4e87b12c 100644
--- a/libstdc++-v3/include/bits/ranges_base.h
+++ b/libstdc++-v3/include/bits/ranges_base.h
@@ -1087,6 +1087,14 @@ namespace __detail
     concept __container_compatible_range
       = ranges::input_range<_Rg>
 	  && convertible_to<ranges::range_reference_t<_Rg>, _Tp>;
+
+  template<ranges::input_range _Range>
+    using __range_key_type
+      = remove_const_t<typename ranges::range_value_t<_Range>::first_type>;
+
+  template<ranges::input_range _Range>
+    using __range_mapped_type
+      = typename ranges::range_value_t<_Range>::second_type;
 }
 /// @endcond
 #endif
-- 
2.47.3