Add literal operators for QLatin1String and QLatin1Char

The operators are declared in the Qt::Literals::StringLiterals
namespace, to avoid collisions in the global namespace.

[ChangeLog][QtCore][QLatin1String] Added literal operator""_L1 that
converts string literals and chars to QLatin1String and QLatin1Char.

Fixes: QTBUG-98434
Change-Id: Ia945a6acf4b8d4fbbb5f803264e4d79d7b17a8da
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>

1 files changed, 45 insertions, 0 deletions

diff --git a/tests/auto/corelib/text/qlatin1string/tst_qlatin1string.cpp b/tests/auto/corelib/text/qlatin1string/tst_qlatin1string.cpp
index 49e87d8a14..c1ca1f74c0 100644
--- a/tests/auto/corelib/text/qlatin1string/tst_qlatin1string.cpp
+++ b/tests/auto/corelib/text/qlatin1string/tst_qlatin1string.cpp
@@ -46,6 +46,7 @@ class tst_QLatin1String : public QObject
 private Q_SLOTS:
     void constExpr();
     void construction();
+    void userDefinedLiterals();
     void at();
     void arg() const;
     void midLeftRight();
@@ -146,6 +147,50 @@ void tst_QLatin1String::construction()
     }
 }
 
+void tst_QLatin1String::userDefinedLiterals()
+{
+    {
+        using namespace Qt::Literals::StringLiterals;
+
+        auto str = "abcd"_L1;
+        static_assert(std::is_same_v<decltype(str), QLatin1String>);
+        QCOMPARE(str.size(), 4);
+        QCOMPARE(str, QLatin1String("abcd"));
+        QCOMPARE(str.latin1(), "abcd");
+        QCOMPARE("abcd"_L1, str.latin1());
+        QCOMPARE("M\xE5rten"_L1, QLatin1String("M\xE5rten"));
+
+        auto ch = 'a'_L1;
+        static_assert(std::is_same_v<decltype(ch), QLatin1Char>);
+        QCOMPARE(ch, QLatin1Char('a'));
+        QCOMPARE(ch.toLatin1(), 'a');
+        QCOMPARE('a'_L1, ch.toLatin1());
+        QCOMPARE('\xE5'_L1, QLatin1Char('\xE5'));
+    }
+    {
+        using namespace Qt::Literals;
+
+        auto str = "abcd"_L1;
+        static_assert(std::is_same_v<decltype(str), QLatin1String>);
+        QCOMPARE(str, QLatin1String("abcd"));
+
+        auto ch = 'a'_L1;
+        static_assert(std::is_same_v<decltype(ch), QLatin1Char>);
+        QCOMPARE(ch, QLatin1Char('a'));
+    }
+    {
+        using namespace Qt;
+
+        auto str = "abcd"_L1;
+        static_assert(std::is_same_v<decltype(str), QLatin1String>);
+        QCOMPARE(str, QLatin1String("abcd"));
+
+        auto ch = 'a'_L1;
+        static_assert(std::is_same_v<decltype(ch), QLatin1Char>);
+        QCOMPARE(ch, QLatin1Char('a'));
+    }
+}
+
 void tst_QLatin1String::at()
 {
     const QLatin1String l1("Hello World");