From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 21 Mar 2023 19:33:37 +0000 (-0600)
Subject: Use assignable_from instead of convertible_to concepts in parallel.h.
X-Git-Tag: v9.5.0-rc1~437^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14933%2Fhead;p=dealii.git

Use assignable_from instead of convertible_to concepts in parallel.h.
---

diff --git a/include/deal.II/base/parallel.h b/include/deal.II/base/parallel.h
index 106493dfe0..4da420b7eb 100644
--- a/include/deal.II/base/parallel.h
+++ b/include/deal.II/base/parallel.h
@@ -135,8 +135,8 @@ namespace parallel
   template <typename InputIterator, typename OutputIterator, typename Function>
   DEAL_II_CXX20_REQUIRES(
     (std::invocable<Function, InputIterator> &&
-     std::convertible_to<std::invoke_result_t<Function, InputIterator>,
-                         decltype(*std::declval<OutputIterator>())>))
+     std::assignable_from<decltype(*std::declval<OutputIterator>()),
+                          std::invoke_result_t<Function, InputIterator>>))
   void transform(const InputIterator &begin_in,
                  const InputIterator &end_in,
                  OutputIterator       out,
@@ -197,9 +197,9 @@ namespace parallel
             typename Function>
   DEAL_II_CXX20_REQUIRES(
     (std::invocable<Function, InputIterator1, InputIterator2> &&
-     std::convertible_to<
-       std::invoke_result_t<Function, InputIterator1, InputIterator2>,
-       decltype(*std::declval<OutputIterator>())>))
+     std::assignable_from<
+       decltype(*std::declval<OutputIterator>()),
+       std::invoke_result_t<Function, InputIterator1, InputIterator2>>))
   void transform(const InputIterator1 &begin_in1,
                  const InputIterator1 &end_in1,
                  InputIterator2        in2,
@@ -263,11 +263,11 @@ namespace parallel
             typename Function>
   DEAL_II_CXX20_REQUIRES(
     (std::invocable<Function, InputIterator1, InputIterator2, InputIterator3> &&
-     std::convertible_to<std::invoke_result_t<Function,
-                                              InputIterator1,
-                                              InputIterator2,
-                                              InputIterator3>,
-                         decltype(*std::declval<OutputIterator>())>))
+     std::assignable_from<decltype(*std::declval<OutputIterator>()),
+                          std::invoke_result_t<Function,
+                                               InputIterator1,
+                                               InputIterator2,
+                                               InputIterator3>>))
   void transform(const InputIterator1 &begin_in1,
                  const InputIterator1 &end_in1,
                  InputIterator2        in2,