From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Sun, 21 Jul 2024 23:23:37 +0000 (-0600)
Subject: Use TaskResult::empty().
X-Git-Tag: v9.6.0-rc1~11^2~2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77c481f1bef45ae9bd70312b542843f5faff5c0d;p=dealii.git

Use TaskResult::empty().
---

diff --git a/include/deal.II/base/task_result.h b/include/deal.II/base/task_result.h
index abbc6f8ade..52fc11edc8 100644
--- a/include/deal.II/base/task_result.h
+++ b/include/deal.II/base/task_result.h
@@ -483,6 +483,10 @@ namespace Threads
   inline void
   TaskResult<T>::join() const
   {
+    Assert(empty() == false,
+           ExcMessage("You can't join a TaskResult object that has not "
+                      "been associated with a task."));
+
     // If we have waited before, then return immediately:
     if (result_is_available)
       return;
@@ -546,6 +550,11 @@ namespace Threads
   inline const T &
   TaskResult<T>::value() const
   {
+    Assert(empty() == false,
+           ExcMessage(
+             "You can't ask for the result of a TaskResult object that "
+             "has not been associated with a task."));
+
     if (!result_is_available)
       join();
     return task_result.value();