source: trunk/src/corelib/io/qdebug.cpp@ 494

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#ifdef QT_NO_DEBUG
#undef QT_NO_DEBUG
#endif
#ifdef qDebug
#undef qDebug
#endif

#include "qdebug.h"

// This file is needed to force compilation of QDebug into the kernel library.

/*!
    \class QDebug
    \ingroup io
    \mainclass
    \brief The QDebug class provides an output stream for debugging information.

    QDebug is used whenever the developer needs to write out debugging or tracing
    information to a device, file, string or console.

    \section1 Basic Use

    In the common case, it is useful to call the qDebug() function to obtain a
    default QDebug object to use for writing debugging information.

    \snippet doc/src/snippets/qdebug/qdebugsnippet.cpp 1

    This constructs a QDebug object using the constructor that accepts a QtMsgType
    value of QtDebugMsg. Similarly, the qWarning(), qCritical() and qFatal()
    functions also return QDebug objects for the corresponding message types.

    The class also provides several constructors for other situations, including
    a constructor that accepts a QFile or any other QIODevice subclass that is
    used to write debugging information to files and other devices. The constructor
    that accepts a QString is used to write to a string for display or serialization.

    \section1 Writing Custom Types to a Stream

    Many standard types can be written to QDebug objects, and Qt provides support for
    most Qt value types. To add support for custom types, you need to implement a
    streaming operator, as in the following example:

    \snippet doc/src/snippets/qdebug/qdebugsnippet.cpp 0

    This is described in the \l{Debugging Techniques} and
    \l{Creating Custom Qt Types#Making the Type Printable}{Creating Custom Qt Types}
    documents.
*/

/*!
    \fn QDebug::QDebug(QIODevice *device)

    Constructs a debug stream that writes to the given \a device.
*/

/*!
    \fn QDebug::QDebug(QString *string)

    Constructs a debug stream that writes to the given \a string.
*/

/*!
    \fn QDebug::QDebug(QtMsgType type)

    Constructs a debug stream that writes to the handler for the message type specified by \a type.
*/

/*!
    \fn QDebug::QDebug(const QDebug &other)

    Constructs a copy of the \a other debug stream.
*/

/*!
    \fn QDebug &QDebug::operator=(const QDebug &other)

    Assigns the \a other debug stream to this stream and returns a reference to
    this stream.
*/

/*!
    \fn QDebug::~QDebug()

    Flushes any pending data to be written and destroys the debug stream.
*/

/*!
    \fn QDebug &QDebug::space()

    Writes a space character to the debug stream and returns a reference to
    the stream.

    The stream will record that the last character sent to the stream was a
    space.

    \sa nospace(), maybeSpace()
*/

/*!
    \fn QDebug &QDebug::nospace()

    Clears the stream's internal flag that records whether the last character
    was a space and returns a reference to the stream.

    \sa space(), maybeSpace()
*/

/*!
    \fn QDebug &QDebug::maybeSpace()

    Writes a space character to the debug stream, depending on the last
    character sent to the stream, and returns a reference to the stream.

    If the last character was a space character, this function writes a space
    character to the stream; otherwise, no characters are written to the stream.

    \sa space(), nospace()
*/

/*!
    \fn QDebug &QDebug::operator<<(QChar t)

    Writes the character, \a t, to the stream and returns a reference to the
    stream.
*/

/*!
    \fn QDebug &QDebug::operator<<(QBool t)
    \internal

    Writes the boolean value, \a t, to the stream and returns a reference to the
    stream.
*/

/*!
    \fn QDebug &QDebug::operator<<(bool t)

    Writes the boolean value, \a t, to the stream and returns a reference to the
    stream.
*/

/*!
    \fn QDebug &QDebug::operator<<(char t)

    Writes the character, \a t, to the stream and returns a reference to the
    stream.
*/

/*!