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50
51#ifndef TRACE_H
52#define TRACE_H
53
54#include <QtCore/QDebug>
55
56#define ENABLE_TRACE
57//#define VERBOSE_TRACE
58
59namespace Trace {
60
61class NullDebug
62{
63public:
64 template <typename T>
65 NullDebug& operator<<(const T&) { return *this; }
66};
67
68inline NullDebug nullDebug() { return NullDebug(); }
69
70template <typename T>
71struct PtrWrapper
72{
73 PtrWrapper(const T *ptr) : m_ptr(ptr) { }
74 const T *const m_ptr;
75};
76
77} // namespace Trace
78
79template <typename T>
80inline QDebug& operator<<(QDebug &debug, const Trace::PtrWrapper<T> &wrapper)
81{
82 QDebugStateSaver saver(debug);
83 debug.nospace() << '[' << static_cast<const void *>(wrapper.m_ptr) << ']';
84 return debug;
85}
86
87template<typename T>
88inline const void *qtVoidPtr(const T *ptr)
89{ return static_cast<const void *>(ptr); }
90
91#define qtThisPtr() qtVoidPtr(this)
92
93#ifdef ENABLE_TRACE
94 inline QDebug qtTrace() { return qDebug() << "[qmlvideo]"; }
95# ifdef VERBOSE_TRACE
96 inline QDebug qtVerboseTrace() { return qtTrace(); }
97# else
98 inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); }
99# endif
100#else
101 inline Trace::NullDebug qtTrace() { return Trace::nullDebug(); }
102 inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); }
103#endif
104
105#endif // TRACE_H
106

source code of qtmultimedia/examples/multimedia/video/qmlvideo/trace.h