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AudioToolbox: Improve AudioUnit dispatch template trickery
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src/CoreAudio/AudioToolbox/AUComponent.cpp
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src/CoreAudio/AudioToolbox/AUComponent.cpp
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const CFStringRef kAudioComponentRegistrationsChangedNotification = CFSTR("AudioComponentRegistrationsChangedNotification");
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const CFStringRef kAudioComponentInstanceInvalidationNotification = CFSTR("AudioComponentInstanceInvalidationNotification");
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inline static void assignParams(ComponentParameters* cp, size_t totalArgs, size_t argumentIndex)
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{
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}
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template <typename First, typename... Rest>
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void assignParams(ComponentParameters* cp, size_t totalArgs, size_t argumentIndex, First arg, Rest... rest)
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{
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#else
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cp->params[totalArgs - argumentIndex - 1] = long(arg);
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#endif
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assignParams(cp, totalArgs, argumentIndex+1, rest...);
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if constexpr (sizeof...(Rest) > 0)
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assignParams(cp, totalArgs, argumentIndex+1, rest...);
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}
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template <typename ...Args>
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else
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{
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ComponentParameters* cp = (ComponentParameters*) alloca(sizeof(ComponentParameters) + sizeof...(Args) * sizeof(long));
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assignParams(cp, sizeof...(Args)+1, 0, inUnit);
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assignParams(cp, sizeof...(Args)+1, 1, args...);
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cp->paramSize = (sizeof...(Args)+1) * sizeof(long);
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constexpr size_t totalArgs = sizeof...(Args)+1;
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assignParams(cp, totalArgs, 0, inUnit);
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if constexpr (totalArgs > 1)
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assignParams(cp, totalArgs, 1, args...);
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cp->paramSize = totalArgs * sizeof(long);
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cp->what = sel;
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cp->flags = 0;
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return CallComponentDispatch(cp);
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}
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}