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I found this on a bulletin board and decided to try it. A little while
back, I was browsing through newsgroups and came across an article ...

I am trying to use double dispatch in the below code:

#include

class Box;
class Sphere;

class geometry_type
{
public:
virtual void haps(geometry_type* other)=0;
virtual void collideWith(Box* other)=0;
virtual void collideWith(Sphere* other) = 0;
};

class Box : public geometry_type
{
public :
Box() {}

virtual void haps(geometry_type* other)
{
other->collideWith(this);
}

Why doe the following C++ code behaves as it does?

int i;

i=1; cout << (++i)++; Output: 2
i=1; cout << ++(++i); Output: 3
i=1; cout << (i++)++; Output: Error. LValue required
i=1; cout << ++(i++); Output: Error. LValue required

Is there any reason why the following C++ code behaves as it does ?

int i;

i=1; cout << (++i)++; Output: 2

i=1; cout << ++(++i); Output: 3

i=1; cout << (i++)++; Output: Error. LValue required

i=1; cout << ++(i++); Output: Error. LValue required

I'm curious, if you have an enum say...

enum Days { Mon, Tue, Wed, Thu, Fri, Sat, Sun };

I understand the default will be Mon=0, Tue=1, Wed=2, etc.

What I'm curious about is if there is a Days attribute in a class,
what is the default assuming I don't do anything with it?

For example

class Foo
{
public:
Days week;
};

If I instantiate a Foo object, what is the default of week? Is there
any possibility (perhaps compiler dependent) that if I created and
destroyed Foo objects at an interval of less than 1 second, could
value of week change?

So for talking purposes say I have...

I have a maxValue function that is called when I am removing a node
from my tree.

template
T BST :: maxValue (TreeNode* p)
{
if (p == NULL) throw ("BAD POINTER");

while (p-> right)
{
p = p-> right;
return *this;
}
}

I am getting this error when it compiles: cannot convert BST to
'int' in return
How do I fix this?

Hi,
I have been reading the improvement that will be made to C++0x, and
one of this is "A Proposal to Add an Rvalue Reference to the C++
Language" , which will add a double &, for example:

int someFunction(int && a){ ...

the reason is to allow to change temporaries passed to functions. Due
to:

void f(int& a);
void ff(const int& a);
...
int x = 5;
f(x); //ok
ff(x); //ok
f(2); // error, not to make mistakes
ff(2); //ok

to can pass changeable temporaries, it has been proposed the syntax
int&&, which I thought is naughty.
void g(int&& a){ a = 0; }
g(2); //ok

Hi All,

Is there any way to catch the exit code from someone calling
exit(status) and check the value before the program terminates?

Just for an idea, the code I'm thinking of is something like this:

void exithandler()
{
DWORD exitCode = 0;
::GetExitCodeProcess(GetCurrentProcess(),&exitCode);
std::cout << exitCode << std::endl;
// prints 259, NOT 55
}

int _tmain(int argc, _TCHAR* argv[])
{
atexit(exithandler);
exit(55);
return 0;
}

Hi!

I recently converted an application from VS2003 to VS2005.
The application consists of a main 'unmanaged C++ executable' which
calls
a managed C++ .dll. The .dll basically launches a separate form.

The application use to work fine in VS2003. Now that I have converted
to VS2005 the main executable is working but an exception gets
thrown when it trys to call the .dll (basically the new separate form
never launches). The .dll was compiled with (/clr:oldSyntax).

This is the exception that gets thrown:

File: dbgheap.c
Line: 1414

Expression: _CrtIsValidHeapPointer(pUserData)

I click on Retry and it triggers a breakpoint at

if ( (oldsize = _msize_crt(*pbegin)) <= (size_t)((char *)(*pend) -
(char *)(*pbegin)) )

This is the call stack:

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