Re: problem when allocating a new object
On Mar 13, 9:41 am, "cpluszen" <mmza...@gmail.com> wrote:
Hi,
I have developped a c++ class and I have used it in different programs
without problems.
Now, I'm modifying a c++ file developped by another person (it is a
code example about how using a library) and I'd like to include in
this code my class functionality. I get an error during execution:
#include "MyClass.h";
MyClass *p=NULL;
OthersClass *p2=NULL;
int main(void){
Abomination! (See http://www.research.att.com/~bs/hopl2.pdf.)
p2 = new OthersClass( );
p = new MyClass(myconstructorarguments);
...
}
The code compiles without problem, but during execution of line
p = new MyClass(myconstructorarguments);
I get the error: "Unhandled exception at 0x0000"
In visual C I can see that operator new returns a valid memory
position (0x00bd7188), but before any line in MyClass constructor is
reached the program crashes.
Can anybody help? Thanks in advance
Can your constructor (or the constructors of any of its members) throw
an exception? Is it throwing an exception? One thing to try is
catching the exception:
try
{
p2 = new OthersClass( );
p = new MyClass(myconstructorarguments);
}
catch( const std::exception& e )
{
std::cout << "Exception: " << e.what() << '\n';
}
catch( ... )
{
std::cout << "Unknown exception\n";
}
You'll want to add catch clauses for any other custom exceptions (or
exception types, e.g., std::exception*) that you or OtherClass may use
that are not related to std::exception. Hopefully you'll see something
useful from that.
Alternately, you may be able to configure your debugger to stop at the
point where the exception is thrown, at which point you can inspect
the call stack and other data to see what caused it.
This problem could also be the result of a wayward pointer somewhere
else in the code (even a seemingly unrelated point).
Cheers! --M