From 8ad9e81694fda39fbecebb9f97491004e9ac8c41 Mon Sep 17 00:00:00 2001
From: Lars Knoll <lars.knoll@qt.io>
Date: Mon, 6 Jul 2020 13:08:40 +0200
Subject: Constrain the debug stream operators for containers

Check that we can successfully instantiate the debug
stream operator for a container before we actually try.

This is required so we can automate registration of debug
stream operators with QMetaType.

Change-Id: I3943e7a443751d250c33b2ca1b9cf29207cfe6c4
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
---
 tests/auto/corelib/io/qdebug/tst_qdebug.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'tests/auto/corelib/io/qdebug/tst_qdebug.cpp')

diff --git a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
index ece9be642a..72412aa44d 100644
--- a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
+++ b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
@@ -35,6 +35,12 @@
 #include <QtConcurrentRun>
 #include <QFutureSynchronizer>
 
+static_assert(QTypeTraits::has_ostream_v<QDebug, int>);
+static_assert(QTypeTraits::has_ostream_v<QDebug, QList<int>>);
+struct NonStreamable {};
+static_assert(!QTypeTraits::has_ostream_v<QDebug, NonStreamable>);
+static_assert(!QTypeTraits::has_ostream_v<QDebug, QList<NonStreamable>>);
+
 class tst_QDebug: public QObject
 {
     Q_OBJECT
-- 
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