trace.h Example File

multimedia/video/qmlvideo/trace.h
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#ifndef TRACE_H #define TRACE_H #include <QtCore/QDebug> #define ENABLE_TRACE //#define VERBOSE_TRACE namespace Trace { class NullDebug { public: template <typename T> NullDebug& operator<<(const T&) { return *this; } }; inline NullDebug nullDebug() { return NullDebug(); } template <typename T> struct PtrWrapper { PtrWrapper(const T *ptr) : m_ptr(ptr) { } const T *const m_ptr; }; } // namespace Trace template <typename T> inline QDebug& operator<<(QDebug &debug, const Trace::PtrWrapper<T> &wrapper) { QDebugStateSaver saver(debug); debug.nospace() << '[' << static_cast<const void *>(wrapper.m_ptr) << ']'; return debug; } template<typename T> inline const void *qtVoidPtr(const T *ptr) { return static_cast<const void *>(ptr); } #define qtThisPtr() qtVoidPtr(this) #ifdef ENABLE_TRACE inline QDebug qtTrace() { return qDebug() << "[qmlvideo]"; } # ifdef VERBOSE_TRACE inline QDebug qtVerboseTrace() { return qtTrace(); } # else inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); } # endif #else inline Trace::NullDebug qtTrace() { return Trace::nullDebug(); } inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); } #endif #endif // TRACE_H

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