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39
40#ifndef QFILEDEVICE_P_H
41#define QFILEDEVICE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include "private/qiodevice_p.h"
55
56#include <memory>
57
58QT_BEGIN_NAMESPACE
59
60class QAbstractFileEngine;
61class QFSFileEngine;
62
63class QFileDevicePrivate : public QIODevicePrivate
64{
65 Q_DECLARE_PUBLIC(QFileDevice)
66protected:
67 QFileDevicePrivate();
68 ~QFileDevicePrivate();
69
70 virtual QAbstractFileEngine *engine() const;
71
72 inline bool ensureFlushed() const;
73
74 bool putCharHelper(char c) override;
75
76 void setError(QFileDevice::FileError err);
77 void setError(QFileDevice::FileError err, const QString &errorString);
78 void setError(QFileDevice::FileError err, int errNum);
79
80 mutable std::unique_ptr<QAbstractFileEngine> fileEngine;
81 mutable qint64 cachedSize;
82
83 QFileDevice::FileHandleFlags handleFlags;
84 QFileDevice::FileError error;
85
86 bool lastWasWrite;
87};
88
89inline bool QFileDevicePrivate::ensureFlushed() const
90{
91 // This function ensures that the write buffer has been flushed (const
92 // because certain const functions need to call it.
93 if (lastWasWrite) {
94 const_cast<QFileDevicePrivate *>(this)->lastWasWrite = false;
95 if (!const_cast<QFileDevice *>(q_func())->flush())
96 return false;
97 }
98 return true;
99}
100
101QT_END_NAMESPACE
102
103#endif // QFILEDEVICE_P_H
104

source code of qtbase/src/corelib/io/qfiledevice_p.h