Re: Objective-C++ newbie questions

• Subject: Re: Objective-C++ newbie questions
• From: Glen Low <email@hidden>
• Date: Thu, 3 Jun 2004 08:38:52 +0800

I'm trying to use some C++ libraries (dcmtk for reading DICOM files) in
our Objective-C/Cocoa app and, while I've got some basic C++-isms to
build and run (e.g. cout << "Hello World!" << endl;) I'm already having
trouble with some includes I need to use the actual libs. To get
"hello world" to work (I realize this doesn't exercise much C++), I
included iostream.h and gave my implementation file the .mm extension.

When I add the first include needed for dcmtk, the build starts failing
(see below).

Below are a list of the initial errors I'm getting. As I am a complete
C++ newbie, I'd be very grateful if anyone could give some hints as to
what is going on and how to fix it.

-----------------------

#error DCMTK needs stringstream or strstream type

(this is actually a header-generated message - I added an include for
/usr/include/gcc/darwin/3.3/c++/backward/strstream but this does not
abolish the above message. What is the correct way to include
str{ing}stream?)

------------------------

error: parse error before `:' token

(it seems to be balking at the C++ class declaration: class
OFConditionString: public OFConditionBase )

------------------------

warning: ISO C++ forbids declaration of `OFConditionString' with no type

(from these lines of code:

/// copy constructor
OFConditionString(const OFConditionString& arg)
: OFConditionBase(arg) // THIS GENERATES THE WARNING
, theCodeAndModule(arg.theCodeAndModule)
, theStatus(arg.theStatus)
, theText(arg.theText)
{
}

)

------------------------

error: only constructors take base initializers

(from this code:

/// copy constructor
OFConditionString(const OFConditionString& arg)
: OFConditionBase(arg) // THIS GENERATES THE ERROR
, theCodeAndModule(arg.theCodeAndModule)
, theStatus(arg.theStatus)
, theText(arg.theText)
{
}

)

------------------------

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