C++ Xcode iOS project errors

Question

I'm working on a iOS project which as several c++ class. But as it seems compiling them are not straightforwards. I tired different methods but all the time give some errors.

1) First I renamed .m;class to .mm and try to compile and it gives a error. in this line

SInt16 *editBuffer = audioBufferList->mBuffers[0].mDat;

Error - "Cannot initialize a variable of type 'SInt16 *' (aka 'short *') with an lvalue of type 'void *'"

2) When setting Other Linker Flags to -ObjC++ it gives these two errors. Unknown type name 'class'; did you mean 'Class'?

'deque' file not found - for #include<deque>

Anyone has any idea , what's wrong here. Thanks in advance.

Linker flags will not effect the compiler. Have you tried setting the compiler option for Objective-C++? — Jeffery Thomas
– Jeffery Thomas, Commented Nov 21, 2012 at 19:06
First error is due to a noncompliant type. If my assumption about this involving CoreAudio is right, audioBufferList->mBuffers[0].mDat is the buffer address. SInt16* and void* types pointing to the same buffer won't behave the same where pointer math is concerned. You need to either cast the void* to SInt16*, or retype editBuffer to a compliant type such as void* or char*. — CuriousRabbit
– CuriousRabbit, Commented Nov 21, 2012 at 19:28

Jeffery Thomas · Accepted Answer · 2012-11-21 19:25:09Z

1

The first error is expected. C++ is finicky about void pointers.

SInt16 *editBuffer = (SInt16 *)(audioBufferList->mBuffers[0].mDat);

or

SInt16 *editBuffer = static_cast<SInt16 *>(audioBufferList->mBuffers[0].mDat);

See Casting To and From void*.

answered Nov 21, 2012 at 19:25

Jeffery Thomas

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