Re: C++ templates?
Re: C++ templates?
- Subject: Re: C++ templates?
- From: "David Piasecki" <email@hidden>
- Date: Thu, 15 Apr 2004 13:21:55 -0700
I didn't even have to use the template. Simply creating one in
MyObject, as shown below again, will crash the program. I don't use any
objective-C objects with this template. See my previous e-mail for the
full template source. It's pretty simple. I think I created the
template correctly, though I could be wrong because I don't use
templates very often. I ended up creating the same MyMath object in a
non-template version, and it works fine, but I would like to be able to
use templates if I can.
Hmmm... I've always used templates that have the syntax <class Type>
instead of <typename Type> like you do. Could that be the problem?
#include "MyMath.h"
class MyObject {
public:
MyObject();
~MyObject();
MyMath<int> mathUtility; // this line causes the app to crash
private:
};
David
On Apr 15, 2004, at 12:28 PM, Allan Odgaard wrote:
>
On 15. Apr 2004, at 20:04, David Piasecki wrote:
>
>
> I tried creating a C++ template for my Cocoa application in XCode. It
>
> compiles fine, but I get a runtime error which crashes my application,
>
> even if all I do is create the object. Source included below...
>
>
Correct me if I am wrong, but your code-snip did not show any usage of
>
the template? Do you use ObjectiveC objects with this template? and
>
what do you have to do at runtime to provoke the crash?
>
>
That said, there does seem to be some template-related problems with
>
ObjectiveC++ resulting in both compile-time (internal compiler error)
>
and run-time problems. For the latter though my problem has so far
>
been limited to calling ObjC methods in templated code, e.g. something
>
like this:
>
>
// main.mm
>
#import <Cocoa/Cocoa.h>
>
>
template <typename T> void dummy ()
>
{
>
[NSFont fontWithName:@"Monaco" size:12.0f];
>
}
>
>
int main (int argc, char const* argv[])
>
{
>
[NSAutoreleasePool new];
>
dummy<int>();
>
return 0;
>
}
>
>
Will crash (at runtime) with a segmentation error -- so generally I
>
avoid having ObjC code in templated code :)
>
>
>
>
>
>
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