Use QString() instead of QStringLiteral("")

And do the same for QByteArray.
Instantiating the default constructor uses QArrayData::sharedNull() for
the d-pointer which is the cheapest constructor in memory and
instructions.

Change-Id: I1ceaafbc0c0cb1ccc5690edba89ea1100f30b3cd
Reviewed-by: Kurt Pattyn <pattyn.kurt@gmail.com>

5 files changed, 19 insertions, 19 deletions

diff --git a/src/websockets/qwebsocket_p.cpp b/src/websockets/qwebsocket_p.cpp
index 8c86aba..6a027da 100644
--- a/src/websockets/qwebsocket_p.cpp
+++ b/src/websockets/qwebsocket_p.cpp
@@ -887,16 +887,16 @@ void QWebSocketPrivate::processHandshake(QTcpSocket *pSocket)
         }
 
         const QString acceptKey = headers.value(QStringLiteral("Sec-WebSocket-Accept"),
-                                                QStringLiteral(""));
-        const QString upgrade = headers.value(QStringLiteral("Upgrade"), QStringLiteral(""));
-        const QString connection = headers.value(QStringLiteral("Connection"), QStringLiteral(""));
+                                                QString());
+        const QString upgrade = headers.value(QStringLiteral("Upgrade"), QString());
+        const QString connection = headers.value(QStringLiteral("Connection"), QString());
 //        unused for the moment
 //        const QString extensions = headers.value(QStringLiteral("Sec-WebSocket-Extensions"),
-//                                                 QStringLiteral(""));
+//                                                 QString());
 //        const QString protocol = headers.value(QStringLiteral("Sec-WebSocket-Protocol"),
-//                                               QStringLiteral(""));
+//                                               QString());
         const QString version = headers.value(QStringLiteral("Sec-WebSocket-Version"),
-                                              QStringLiteral(""));
+                                              QString());
 
         if (Q_LIKELY(httpStatusCode == 101)) {
             //HTTP/x.y 101 Switching Protocols
@@ -975,8 +975,8 @@ void QWebSocketPrivate::processStateChanged(QAbstractSocket::SocketState socketS
                                                 % QStringLiteral(":")
                                                 % QString::number(m_requestUrl.port(80)),
                                            origin(),
-                                           QStringLiteral(""),
-                                           QStringLiteral(""),
+                                           QString(),
+                                           QString(),
                                            m_key);
             m_pSocket->write(handshake.toLatin1());
         }
diff --git a/src/websockets/qwebsockethandshakerequest.cpp b/src/websockets/qwebsockethandshakerequest.cpp
index fbc25a7..c47dfd0 100644
--- a/src/websockets/qwebsockethandshakerequest.cpp
+++ b/src/websockets/qwebsockethandshakerequest.cpp
@@ -229,7 +229,7 @@ void QWebSocketHandshakeRequest::readHandshake(QTextStream &textStream)
         headerLine = textStream.readLine();
     }
 
-    const QString host = m_headers.value(QStringLiteral("Host"), QStringLiteral(""));
+    const QString host = m_headers.value(QStringLiteral("Host"), QString());
     m_requestUrl = QUrl::fromEncoded(resourceName.toLatin1());
     if (m_requestUrl.isRelative())
         m_requestUrl.setHost(host);
@@ -255,11 +255,11 @@ void QWebSocketHandshakeRequest::readHandshake(QTextStream &textStream)
     }
     //sort in descending order
     std::sort(m_versions.begin(), m_versions.end(), std::greater<QWebSocketProtocol::Version>());
-    m_key = m_headers.value(QStringLiteral("Sec-WebSocket-Key"), QStringLiteral(""));
+    m_key = m_headers.value(QStringLiteral("Sec-WebSocket-Key"), QString());
     //must contain "Upgrade", case-insensitive
-    const QString upgrade = m_headers.value(QStringLiteral("Upgrade"), QStringLiteral(""));
+    const QString upgrade = m_headers.value(QStringLiteral("Upgrade"), QString());
     //must be equal to "websocket", case-insensitive
-    const QString connection = m_headers.value(QStringLiteral("Connection"), QStringLiteral(""));
+    const QString connection = m_headers.value(QStringLiteral("Connection"), QString());
     const QStringList connectionLine = connection.split(QStringLiteral(","),
                                                         QString::SkipEmptyParts);
     QStringList connectionValues;
@@ -267,7 +267,7 @@ void QWebSocketHandshakeRequest::readHandshake(QTextStream &textStream)
         connectionValues << (*c).trimmed();
 
     //optional headers
-    m_origin = m_headers.value(QStringLiteral("Sec-WebSocket-Origin"), QStringLiteral(""));
+    m_origin = m_headers.value(QStringLiteral("Sec-WebSocket-Origin"), QString());
     const QStringList protocolLines = m_headers.values(QStringLiteral("Sec-WebSocket-Protocol"));
     for (QStringList::const_iterator pl = protocolLines.begin(); pl != protocolLines.end(); ++pl) {
         QStringList protocols = (*pl).split(QStringLiteral(","), QString::SkipEmptyParts);
diff --git a/tests/auto/websocketcorsauthenticator/tst_websocketcorsauthenticator.cpp b/tests/auto/websocketcorsauthenticator/tst_websocketcorsauthenticator.cpp
index 6d44241..7bb44b1 100644
--- a/tests/auto/websocketcorsauthenticator/tst_websocketcorsauthenticator.cpp
+++ b/tests/auto/websocketcorsauthenticator/tst_websocketcorsauthenticator.cpp
@@ -92,7 +92,7 @@ void tst_WebSocketCorsAuthenticator::cleanup()
 void tst_WebSocketCorsAuthenticator::tst_initialization()
 {
     {
-        QWebSocketCorsAuthenticator authenticator(QStringLiteral(""));
+        QWebSocketCorsAuthenticator authenticator((QString()));
 
         QCOMPARE(authenticator.allowed(), true);
         QCOMPARE(authenticator.origin(), QString());
diff --git a/tests/auto/websocketframe/tst_websocketframe.cpp b/tests/auto/websocketframe/tst_websocketframe.cpp
index e3f3e12..46a360a 100644
--- a/tests/auto/websocketframe/tst_websocketframe.cpp
+++ b/tests/auto/websocketframe/tst_websocketframe.cpp
@@ -274,12 +274,12 @@ void tst_WebSocketFrame::tst_goodFrames_data()
     QTest::newRow("Non masked final text frame with no payload")
             << 0 << 0 << 0
             << 0U << QWebSocketProtocol::OC_TEXT
-            << true << QByteArrayLiteral("")
+            << true << QByteArray()
             << false << true << false;
     QTest::newRow("Non masked final binary frame with no payload")
             << 0 << 0 << 0
             << 0U << QWebSocketProtocol::OC_BINARY
-            << true << QByteArrayLiteral("")
+            << true << QByteArray()
             << false << true << false;
 
     QTest::newRow("Non masked final close frame with small payload")
@@ -290,7 +290,7 @@ void tst_WebSocketFrame::tst_goodFrames_data()
     QTest::newRow("Non masked final close frame with no payload")
             << 0 << 0 << 0
             << 0U << QWebSocketProtocol::OC_CLOSE
-            << true << QByteArrayLiteral("")
+            << true << QByteArray()
             << true << false << false;
     QTest::newRow("Non masked final ping frame with small payload")
             << 0 << 0 << 0
@@ -300,7 +300,7 @@ void tst_WebSocketFrame::tst_goodFrames_data()
     QTest::newRow("Non masked final pong frame with no payload")
             << 0 << 0 << 0
             << 0U << QWebSocketProtocol::OC_PONG
-            << true << QByteArrayLiteral("")
+            << true << QByteArray()
             << true << false << false;
 
     QTest::newRow("Non masked final continuation frame with small payload")
diff --git a/tests/auto/websocketprotocol/tst_websocketprotocol.cpp b/tests/auto/websocketprotocol/tst_websocketprotocol.cpp
index 433d53a..fa3177c 100644
--- a/tests/auto/websocketprotocol/tst_websocketprotocol.cpp
+++ b/tests/auto/websocketprotocol/tst_websocketprotocol.cpp
@@ -101,7 +101,7 @@ void tst_WebSocketProtocol::tst_validMasks_data()
     QTest::addColumn<QString>("inputdata");
     QTest::addColumn<QByteArray>("result");
 
-    QTest::newRow("Empty payload") << 0x12345678u << QStringLiteral("") << QByteArrayLiteral("");
+    QTest::newRow("Empty payload") << 0x12345678u << QString() << QByteArray();
     QTest::newRow("ASCII payload of 8 characters") << 0x12345678u << QStringLiteral("abcdefgh") << QByteArrayLiteral("\x73\x56\x35\x1C\x77\x52\x31\x10");
     QTest::newRow("ASCII payload of 9 characters") << 0x12345678u << QStringLiteral("abcdefghi") << QByteArrayLiteral("\x73\x56\x35\x1C\x77\x52\x31\x10\x7B");
     //MSVC doesn't like UTF-8 in source code; the following text is represented in the string below: ∫∂ƒ©øØ