From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 21 Aug 2024 22:19:46 +0000 (-0600)
Subject: Add TaskResult::emplace_object().
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15aad27f7fee2fcccb8bdb2ca1f70312de4882ab;p=dealii.git

Add TaskResult::emplace_object().
---

diff --git a/include/deal.II/base/task_result.h b/include/deal.II/base/task_result.h
index f00fc958f8..ce2cce7d89 100644
--- a/include/deal.II/base/task_result.h
+++ b/include/deal.II/base/task_result.h
@@ -320,6 +320,34 @@ namespace Threads
     try_emplace_task(const Callable &creator) const
       DEAL_II_CXX20_REQUIRES((std::is_invocable_r_v<T, Callable>));
 
+    /**
+     * Instead of letting a task compute the object stored by this
+     * instance of Lazy, just copy the object passed as an argument
+     * and use it instead.
+     *
+     * As for several other member functions, this function can only be called
+     * if there is not currently a running task whose result is supposed to
+     * be used.
+     */
+    void
+    emplace_object(const T &t)
+      DEAL_II_CXX20_REQUIRES((std::is_copy_constructible_v<T> ||
+                              std::is_copy_assignable_v<T>));
+
+    /**
+     * Instead of letting a task compute the object stored by this
+     * instance of Lazy, just move the object passed as an argument
+     * and use it instead.
+     *
+     * As for several other member functions, this function can only be called
+     * if there is not currently a running task whose result is supposed to
+     * be used.
+     */
+    void
+    emplace_object(T &&t)
+      DEAL_II_CXX20_REQUIRES((std::is_copy_constructible_v<T> ||
+                              std::is_copy_assignable_v<T>));
+
     /**
      * Reset the current object to a state as if it had been
      * default-constructed. For the same reasons as outlined
@@ -499,6 +527,30 @@ namespace Threads
 
 
 
+  template <typename T>
+  inline void
+  TaskResult<T>::emplace_object(const T &t)
+    DEAL_II_CXX20_REQUIRES((std::is_copy_constructible_v<T> ||
+                            std::is_copy_assignable_v<T>))
+  {
+    clear();
+    task_result         = t;
+    result_is_available = true;
+  }
+
+
+  template <typename T>
+  inline void
+  TaskResult<T>::emplace_object(T &&t)
+    DEAL_II_CXX20_REQUIRES((std::is_copy_constructible_v<T> ||
+                            std::is_copy_assignable_v<T>))
+  {
+    clear();
+    task_result         = std::move(t);
+    result_is_available = true;
+  }
+
+
   template <typename T>
   inline void
   TaskResult<T>::clear()