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Use a macro to pretend virtual functions.

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This commit is contained in:
Tsuda Kageyu 2017-06-13 17:01:53 +09:00
parent eeb2f5de09
commit e026d797e0
1 changed files with 35 additions and 88 deletions
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123
taglib/audioproperties.cpp
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@ -43,6 +43,39 @@
using namespace TagLib;
// This macro is a workaround for the fact that we can't add virtual functions.
// Should be true virtual functions in taglib2.
#define VIRTUAL_FUNCTION_WORKAROUND(function_name, default_value) \
if(dynamic_cast<const APE::Properties*>(this)) \
return dynamic_cast<const APE::Properties*>(this)->function_name(); \
else if(dynamic_cast<const ASF::Properties*>(this)) \
return dynamic_cast<const ASF::Properties*>(this)->function_name(); \
else if(dynamic_cast<const FLAC::Properties*>(this)) \
return dynamic_cast<const FLAC::Properties*>(this)->function_name(); \
else if(dynamic_cast<const MP4::Properties*>(this)) \
return dynamic_cast<const MP4::Properties*>(this)->function_name(); \
else if(dynamic_cast<const MPC::Properties*>(this)) \
return dynamic_cast<const MPC::Properties*>(this)->function_name(); \
else if(dynamic_cast<const MPEG::Properties*>(this)) \
return dynamic_cast<const MPEG::Properties*>(this)->function_name(); \
else if(dynamic_cast<const Ogg::Opus::Properties*>(this)) \
return dynamic_cast<const Ogg::Opus::Properties*>(this)->function_name(); \
else if(dynamic_cast<const Ogg::Speex::Properties*>(this)) \
return dynamic_cast<const Ogg::Speex::Properties*>(this)->function_name(); \
else if(dynamic_cast<const TrueAudio::Properties*>(this)) \
return dynamic_cast<const TrueAudio::Properties*>(this)->function_name(); \
else if(dynamic_cast<const RIFF::AIFF::Properties*>(this)) \
return dynamic_cast<const RIFF::AIFF::Properties*>(this)->function_name(); \
else if(dynamic_cast<const RIFF::WAV::Properties*>(this)) \
return dynamic_cast<const RIFF::WAV::Properties*>(this)->function_name(); \
else if(dynamic_cast<const Vorbis::Properties*>(this)) \
return dynamic_cast<const Vorbis::Properties*>(this)->function_name(); \
else if(dynamic_cast<const WavPack::Properties*>(this)) \
return dynamic_cast<const WavPack::Properties*>(this)->function_name(); \
else \
return (default_value);
class AudioProperties::AudioPropertiesPrivate
{
@ -59,98 +92,12 @@ AudioProperties::~AudioProperties()
int AudioProperties::lengthInSeconds() const
{
// This is an ugly workaround but we can't add a virtual function.
// Should be virtual in taglib2.
if(dynamic_cast<const APE::Properties*>(this))
return dynamic_cast<const APE::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const ASF::Properties*>(this))
return dynamic_cast<const ASF::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const FLAC::Properties*>(this))
return dynamic_cast<const FLAC::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const MP4::Properties*>(this))
return dynamic_cast<const MP4::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const MPC::Properties*>(this))
return dynamic_cast<const MPC::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const MPEG::Properties*>(this))
return dynamic_cast<const MPEG::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const Ogg::Opus::Properties*>(this))
return dynamic_cast<const Ogg::Opus::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const Ogg::Speex::Properties*>(this))
return dynamic_cast<const Ogg::Speex::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const TrueAudio::Properties*>(this))
return dynamic_cast<const TrueAudio::Properties*>(this)->lengthInSeconds();
else if (dynamic_cast<const RIFF::AIFF::Properties*>(this))
return dynamic_cast<const RIFF::AIFF::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const RIFF::WAV::Properties*>(this))
return dynamic_cast<const RIFF::WAV::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const Vorbis::Properties*>(this))
return dynamic_cast<const Vorbis::Properties*>(this)->lengthInSeconds();
else if(dynamic_cast<const WavPack::Properties*>(this))
return dynamic_cast<const WavPack::Properties*>(this)->lengthInSeconds();
else
return 0;
VIRTUAL_FUNCTION_WORKAROUND(lengthInSeconds, 0)
}
int AudioProperties::lengthInMilliseconds() const
{
// This is an ugly workaround but we can't add a virtual function.
// Should be virtual in taglib2.
if(dynamic_cast<const APE::Properties*>(this))
return dynamic_cast<const APE::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const ASF::Properties*>(this))
return dynamic_cast<const ASF::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const FLAC::Properties*>(this))
return dynamic_cast<const FLAC::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const MP4::Properties*>(this))
return dynamic_cast<const MP4::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const MPC::Properties*>(this))
return dynamic_cast<const MPC::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const MPEG::Properties*>(this))
return dynamic_cast<const MPEG::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const Ogg::Opus::Properties*>(this))
return dynamic_cast<const Ogg::Opus::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const Ogg::Speex::Properties*>(this))
return dynamic_cast<const Ogg::Speex::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const TrueAudio::Properties*>(this))
return dynamic_cast<const TrueAudio::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const RIFF::AIFF::Properties*>(this))
return dynamic_cast<const RIFF::AIFF::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const RIFF::WAV::Properties*>(this))
return dynamic_cast<const RIFF::WAV::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const Vorbis::Properties*>(this))
return dynamic_cast<const Vorbis::Properties*>(this)->lengthInMilliseconds();
else if(dynamic_cast<const WavPack::Properties*>(this))
return dynamic_cast<const WavPack::Properties*>(this)->lengthInMilliseconds();
else
return 0;
VIRTUAL_FUNCTION_WORKAROUND(lengthInMilliseconds, 0)
}
////////////////////////////////////////////////////////////////////////////////