iphone - Objective C 中的 ~ 前缀

Question

我一直在学习 iPhone 上的核心音频，在查看 Apple 的示例代码时，我发现了这一点:

#include <AudioToolbox/AudioToolbox.h>

#include "CAStreamBasicDescription.h"
#include "CAXException.h"

#define kNumberBuffers 3

class AQPlayer
    {
    public:
        AQPlayer();
        ~AQPlayer();

        OSStatus                        StartQueue(BOOL inResume);
        OSStatus                        StopQueue();        
        OSStatus                        PauseQueue();

        AudioQueueRef                   Queue()                 { return mQueue;}
        CAStreamBasicDescription        DataFormat() const      { return mDataFormat; }     
        Boolean                         IsRunning() const       { return (mIsRunning) ? true : false; }
        Boolean                         IsInitialized() const   { return mIsInitialized; }      
        CFStringRef                     GetFilePath() const     { return (mFilePath) ? mFilePath : CFSTR(""); }
        Boolean                         IsLooping() const       { return mIsLooping; }

        void SetLooping(Boolean inIsLooping)    { mIsLooping = inIsLooping; }
        void CreateQueueForFile(CFStringRef inFilePath);
        void DisposeQueue(Boolean inDisposeFile);   

    private:
        UInt32                          GetNumPacketsToRead()               { return mNumPacketsToRead; }
        SInt64                          GetCurrentPacket()                  { return mCurrentPacket; }
        AudioFileID                     GetAudioFileID()                    { return mAudioFile; }
        void                            SetCurrentPacket(SInt64 inPacket)   { mCurrentPacket = inPacket; }

        void                            SetupNewQueue();

        AudioQueueRef                   mQueue;
        AudioQueueBufferRef             mBuffers[kNumberBuffers];
        AudioFileID                     mAudioFile;
        CFStringRef                     mFilePath;
        CAStreamBasicDescription        mDataFormat;
        Boolean                         mIsInitialized;
        UInt32                          mNumPacketsToRead;
        SInt64                          mCurrentPacket;
        UInt32                          mIsRunning;
        Boolean                         mIsDone;
        Boolean                         mIsLooping;

        static void isRunningProc(      void *              inUserData,
                                        AudioQueueRef           inAQ,
                                        AudioQueuePropertyID    inID);

        static void AQBufferCallback(   void *                  inUserData,
                                        AudioQueueRef           inAQ,
                                        AudioQueueBufferRef     inCompleteAQBuffer); 

        void CalculateBytesForTime(     CAStreamBasicDescription & inDesc, 
                                        UInt32 inMaxPacketSize, 
                                        Float64 inSeconds, 
                                        UInt32 *outBufferSize, 
                                        UInt32 *outNumPackets);                                                                     
    };

有谁知道这一行的作用:~AQPlayer();没见过~这个符号用过。

Answer 1

这与 c 无关。它看起来像 c++，在这种情况下，~ 是该类的 desctructor。您可能想阅读 C++ FAQ 中的析构函数。