Compile errors with Objective-C++ properties as STL/TR1 smart pointers

2009-12-26 Thread Tron Thomas 
I'm running into a issue using STL/TR1 smart pointers with Objective-C++ 
properties that I think is a bug, and I wanted to get some feedback before I 
submitted any bug report.

The following code:

#import Cocoa/Cocoa.h
#import tr1/memory

class Value
{
public:
explicit Value(int amount) : m_amount(amount){}

int GetAmount() const { return m_amount; }

private:
int m_amount;
};

typedef std::tr1::shared_ptrValue ValuePtr;

@interface ValueUser : NSObject
{
@private
ValuePtr* _valuePtr;
}
- (id)initWithValue:(ValuePtr)valuePtr;
@property ValuePtr value;
@end

@implementation ValueUser
- (id)initWithValue:(ValuePtr)valuePtr
{
self = [super init];
_valuePtr = new ValuePtr(valuePtr);
return self;
}

- (void)setValue:(ValuePtr)valuePtr
{
*_valuePtr = valuePtr;
}

- (ValuePtr)value
{
return *_valuePtr;
}

- (void)dealloc
{
delete _valuePtr;
[super dealloc];
}
@end

int main()
{
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

ValuePtr valuePtr(new Value(42));
ValueUser* valueUser = [[ValueUser alloc] initWithValue:valuePtr];

::NSLog(@The value's amount is %d, valueUser.value-GetAmount());

[valueUser release];

[pool release];

return 0;
}

will produce these errors on the line in the main function containing the NSLog 
call:
error: lvalue required as unary ‘’ operand
error: base operand of ‘-’ has non-pointer type ‘ValuePtr’

If I replace the line with:
::NSLog(@The value's amount is %d, [valueUser value]-GetAmount());

Everything compiles successfully.  What is the reason the '.' syntax will not 
work in this instance?

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Re: Compile errors with Objective-C++ properties as STL/TR1 smart pointers

2009-12-26 Thread Brian Bruinewoud 
It's probably just a parsing thing, have you tried:
 ::NSLog(@The value's amount is %d, (valueUser.value)-GetAmount());
?


On 27/12/2009, at 11:20 , Tron Thomas wrote:

 I'm running into a issue using STL/TR1 smart pointers with Objective-C++ 
 properties that I think is a bug, and I wanted to get some feedback before I 
 submitted any bug report.
 
 The following code:
 
 #import Cocoa/Cocoa.h
 #import tr1/memory
 
 class Value
 {
 public:
explicit Value(int amount) : m_amount(amount){}
 
int GetAmount() const { return m_amount; }
 
 private:
int m_amount;
 };
 
 typedef std::tr1::shared_ptrValue ValuePtr;
 
 @interface ValueUser : NSObject
 {
 @private
ValuePtr* _valuePtr;
 }
 - (id)initWithValue:(ValuePtr)valuePtr;
 @property ValuePtr value;
 @end
 
 @implementation ValueUser
 - (id)initWithValue:(ValuePtr)valuePtr
 {
self = [super init];
_valuePtr = new ValuePtr(valuePtr);
return self;
 }
 
 - (void)setValue:(ValuePtr)valuePtr
 {
*_valuePtr = valuePtr;
 }
 
 - (ValuePtr)value
 {
return *_valuePtr;
 }
 
 - (void)dealloc
 {
delete _valuePtr;
[super dealloc];
 }
 @end
 
 int main()
 {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
 
ValuePtr valuePtr(new Value(42));
ValueUser* valueUser = [[ValueUser alloc] initWithValue:valuePtr];
 
::NSLog(@The value's amount is %d, valueUser.value-GetAmount());
 
[valueUser release];
 
[pool release];
 
return 0;
 }
 
 will produce these errors on the line in the main function containing the 
 NSLog call:
 error: lvalue required as unary ‘’ operand
 error: base operand of ‘-’ has non-pointer type ‘ValuePtr’
 
 If I replace the line with:
::NSLog(@The value's amount is %d, [valueUser value]-GetAmount());
 
 Everything compiles successfully.  What is the reason the '.' syntax will not 
 work in this instance?
 
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 This email sent to br...@darknova.com

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Re: Compile errors with Objective-C++ properties as STL/TR1 smart pointers

2009-12-26 Thread Tron Thomas 

I tried (valueUser.value)-GetAmount()) and I still get the same errors.

Date: Sun, 27 Dec 2009 11:47:35 +1100
From: Brian Bruinewoudbr...@darknova.com
Subject: Re: Compile errors with Objective-C++ properties as STL/TR1
smart   pointers
To: undisclosed-recipients: ;
Cc: cocoa-dev@lists.apple.com
Message-ID:bff7a0e2-640d-4407-bcde-38fc06046...@darknova.com
Content-Type: text/plain; charset=windows-1252

It's probably just a parsing thing, have you tried:
   

::NSLog(@The value's amount is %d, (valueUser.value)-GetAmount());
 

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