C++ Cannot convert from deferred::SafePtr<T> to T* - c++

Question

I have made a test case to show the problems I am running into. Please forgive me my ignorance on the issues of Deferred libraries and pointer casting. The only library included in the deferred.lib.
#include <deferred/deferred.h>
using namespace deferred;
SafePtr<Deferred> recordTime(int time)
{
SafePtr<Deferred> d = createDeferred();
SafePtr<CallbackData> p = new PointerCBD< char>( 0 );
d->execute(p);
return d;
}
int main(int argc, char* argv[])
{
while(1)
{
SafePtr<Deferred> d = recordTime(1000);
d->waitHereForCompletion();
char* c = dynamic_pointer_cast<char>(d->endResult());
}
return 0;
}
When I try and compile in Windows XP with VS2008 I get:
Error C2440: 'initializing' : cannot convert from
'deferred:SafePtr' to 'char *' with
[T=char]
No user-defined-conversion operator available that can perform this
conversion, or the operator cannot be called.
I have tried this command to return a pointer, rather than a SafePtr:
ManagerTimings* t = dynamic_pointer_cast<ManagerTimings>(d->endResult()).get();
Then I get this error:
Error C2664: 'deferred::intrusive_ptr_release' : cannot convert
parameter 1 from 'char *' to
'deferred:ReferenceCountable *'
I have tried this command:
ManagerTimings* t = dynamic_pointer_cast<ManagerTimings>(d->endResult().get());
Then I get this error:
Error C2784: 'deferred::SafePtr deferred::dynamic_pointer_cast(const deferred::SafePtr< U > &)' : could not deduce template argument for 'const deferred::SafePtr< U > &' from 'deferred::CallbackData *'

Answer 1

Try this:
ManagerTimings* t = dynamic_pointer_cast<ManagerTimings>(d->endResult().get());
if you want to get an "unsafe" pointer, or probably this:
SafePtr<ManagerTimings> t= dynamic_pointer_cast<ManagerTimings>(d->endResult());
to get a safe ManagerTimings pointer. I don't know what library you are using, but I suspect that dynamic_pointer_cast can convert a SafePtr to another SafePtr. Or it just converts pointers.

Answer 2

&*d->endResult()
I think from this code endResult is the SafePtr you're having trouble with.