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-rw-r--r--src/corelib/io/qdebug.cpp73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index bd43963139..9cb5609dac 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -47,6 +47,9 @@
#endif
#include "qdebug.h"
+#include <private/qtextstream_p.h>
+
+QT_BEGIN_NAMESPACE
// This file is needed to force compilation of QDebug into the kernel library.
@@ -170,6 +173,8 @@
between writes.
\since 5.0
+
+ \sa QDebugStateSaver
*/
/*!
@@ -179,6 +184,8 @@
automatic insertion of spaces is disabled.
\since 5.0
+
+ \sa QDebugStateSaver
*/
/*!
@@ -321,3 +328,69 @@
\fn QDebug &QDebug::operator<<(QTextStreamManipulator m)
\internal
*/
+
+/*!
+ \class QDebugStateSaver
+
+ \brief Convenience class for custom QDebug operators
+
+ Saves the settings used by QDebug, and restores them upon destruction.
+
+ The automatic insertion of spaces between writes is one of the settings
+ that QDebugStateSaver stores for the duration of the current block.
+
+ The settings of the internal QTextStream are also saved and restored,
+ so that using << hex in a QDebug operator doesn't affect other QDebug
+ operators.
+
+ \since 5.1
+*/
+
+class QDebugStateSaverPrivate
+{
+public:
+ QDebugStateSaverPrivate(QDebug &dbg)
+ : m_dbg(dbg),
+ m_spaces(dbg.autoInsertSpaces()),
+ m_streamParams(dbg.stream->ts.d_ptr->params)
+ {
+ }
+ void restoreState()
+ {
+ m_dbg.setAutoInsertSpaces(m_spaces);
+ m_dbg.stream->ts.d_ptr->params = m_streamParams;
+ }
+
+ QDebug &m_dbg;
+
+ // QDebug state
+ const bool m_spaces;
+
+ // QTextStream state
+ const QTextStreamPrivate::Params m_streamParams;
+};
+
+
+/*!
+ Creates a QDebugStateSaver instance, which saves the settings
+ currently used by \a dbg.
+
+ \sa QDebug::setAutoInsertSpaces(), QDebug::autoInsertSpaces()
+*/
+QDebugStateSaver::QDebugStateSaver(QDebug &dbg)
+ : d(new QDebugStateSaverPrivate(dbg))
+{
+}
+
+/*!
+ Destroyes a QDebugStateSaver instance, which restores the settings
+ used by \a dbg when the QDebugStateSaver instance was created.
+
+ \sa QDebug::setAutoInsertSpaces(), QDebug::autoInsertSpaces()
+*/
+QDebugStateSaver::~QDebugStateSaver()
+{
+ d->restoreState();
+}
+
+QT_END_NAMESPACE