Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace, with manual
unstaging of the actual definition and documentation in dist/,
src/corelib/doc/ and src/corelib/global/.

Task-number: QTBUG-99313
Change-Id: I4c7114444a325ad4e62d0fcbfd347d2bbfb21541
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/corelib/serialization/json/tst_qtjson.cpp b/tests/auto/corelib/serialization/json/tst_qtjson.cpp
index c7043ca433..6b553322b7 100644
--- a/tests/auto/corelib/serialization/json/tst_qtjson.cpp
+++ b/tests/auto/corelib/serialization/json/tst_qtjson.cpp
@@ -940,7 +940,7 @@ void tst_QtJson::testValueRef()
     QCOMPARE(object.value(QLatin1String("null")), QJsonValue());
     object[QLatin1String("null")] = 100.;
     QCOMPARE(object.value(QLatin1String("null")).type(), QJsonValue::Double);
-    QJsonValue val = qAsConst(object)[QLatin1String("null")];
+    QJsonValue val = std::as_const(object)[QLatin1String("null")];
     QCOMPARE(val.toDouble(), 100.);
     QCOMPARE(object.size(), 2);