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Re: Objective C++ from Objective C
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Re: Objective C++ from Objective C


  • Subject: Re: Objective C++ from Objective C
  • From: Wayne Packard <email@hidden>
  • Date: Mon, 02 Feb 2009 17:16:58 -0800

Hi,

The build system uses the file extension of the source file to determine how to treat the code in the file. .m files get treated as Objective-C (by default). .mm files get treated as Objective-C++. Try renaming your source code file from sourcecode.cpp.objcpp to sourcecode.mm and see if you get better results.

wp

On Feb 2, 2009, at 5:08 PM, James Trankelson wrote:

Hi,

For the majority of my OS X programming life, I've been using
Objective C exclusively. However, I now have a reason to want to use
some C++ standard template libraries, and have started looking into
Objective C++. I've found the documentation on Objective C++ lacking,
and was hoping if someone could just show me how I can accomplish the
following:

From an Objective C class, allocate an object that can contain
references to C++ standard template libraries.

For example:

#include "OCPP_Class.h"

@implementation OC_Class

-(void) foo {
 OCPP_Class *bar = [[OCPP_Class alloc] init];
}

@end


@implementation OCPP_Class

-(id) init
{
 std::list<int> temp;
}

@end

When I try to compile this (with the latter compiled as
sourcecode.cpp.objcpp), the compiler complains about the reference in
the  OC_Class where I allocate my object. Something about the first
parameter being of the wrong pointer type.

While this sounds like something I might suspect with C++ trying to
send the this pointer, I have no idea how to get around this, or how
to fix it. Can anyone point me in the right direction?

Thanks.

-jim
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  • Follow-Ups:
    • Re: Objective C++ from Objective C
      • From: James Trankelson <email@hidden>
References: 
 >Objective C++ from Objective C (From: James Trankelson <email@hidden>)

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