tst_qpromise: build fix

The test use aggregate initialization on some classes which however
are no longer aggregates in C++20 (the rules changed again; in C++20
having a user-*declared* constructor makes a class not an aggregate).

Just add a constructor so the code keeps compiling in both 17 and 20.

Fixes: QTBUG-92963
Pick-to: 6.0 6.1
Change-Id: I52371c5ee34c84358987b5ae8bee9ab9c49c8eab
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 4 insertions, 4 deletions

diff --git a/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp b/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
index b956619e11..8321b4126f 100644
--- a/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
+++ b/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
@@ -78,21 +78,21 @@ private slots:
 struct TrivialType { int field = 0; };
 struct CopyOnlyType {
     Q_DISABLE_MOVE(CopyOnlyType)
-    CopyOnlyType() = default;
+    constexpr CopyOnlyType(int field = 0) noexcept : field(field) {}
     CopyOnlyType(const CopyOnlyType &) = default;
     CopyOnlyType& operator=(const CopyOnlyType &) = default;
     ~CopyOnlyType() = default;
 
-    int field = 0;
+    int field;
 };
 struct MoveOnlyType {
     Q_DISABLE_COPY(MoveOnlyType)
-    MoveOnlyType() = default;
+    constexpr MoveOnlyType(int field = 0) noexcept : field(field) {}
     MoveOnlyType(MoveOnlyType &&) = default;
     MoveOnlyType& operator=(MoveOnlyType &&) = default;
     ~MoveOnlyType() = default;
 
-    int field = 0;
+    int field;
 };
 bool operator==(const CopyOnlyType &a, const CopyOnlyType &b) { return a.field == b.field; }
 bool operator==(const MoveOnlyType &a, const MoveOnlyType &b) { return a.field == b.field; }