De-inline QIODevice::write(const QByteArray &)

Since QRingBuffer is used as a temporary store for data to be written
to a buffered device, we can implement a "zero-copy" strategy between
the user-space code and QIODevice's internal write buffer. As a first
step, we should have an entry point, where we can implement a possible
solution.

Change-Id: I1c658c13accc98c65a802be943688359cc9f9917
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qiodevice.cpp

@@ -1739,8 +1739,7 @@ qint64 QIODevice::write(const char *data)
     return write(data, qstrlen(data));
 }
 
-/*! \fn qint64 QIODevice::write(const QByteArray &byteArray)
-
+/*!
     \overload
 
     Writes the content of \a byteArray to the device. Returns the number of
@@ -1749,6 +1748,11 @@ qint64 QIODevice::write(const char *data)
     \sa read(), writeData()
 */
 
+qint64 QIODevice::write(const QByteArray &data)
+{
+    return write(data.constData(), data.size());
+}
+
 /*!
     Puts the character \a c back into the device, and decrements the
     current position unless the position is 0. This function is

src/corelib/io/qiodevice.h

@@ -133,8 +133,7 @@ public:
 
     qint64 write(const char *data, qint64 len);
     qint64 write(const char *data);
-    inline qint64 write(const QByteArray &data)
-    { return write(data.constData(), data.size()); }
+    qint64 write(const QByteArray &data);
 
     qint64 peek(char *data, qint64 maxlen);
     QByteArray peek(qint64 maxlen);