some problem about tonum command

code like these:


treenode kkk=tonode(234);
double jjjj=tonum(kkk);
pf(jjjj);
pr();

I do not konw why jjjj=234;because kkk==NULL,jjjj shoud be 0 or some else. the description say use a pointer,but that is not correct.

tonum(thing) Description:Assert type as an arithmetic number. Only serves a real purpose in C++, but is encouraged to use in flexscript to ensure cross-compatibility between flexscript and C++.

You will use this often for returning a pointer to an object or node in a field that should return a number, which applies to all triggers and combobox fields in Flexsim.

This is because the features of C++ pointer

1.FlexScript: somenode = tonode(address)

2.FlexScript: address = tonum(somenode)

Originally Posted by LINWEIXU

because kkk==NULL

kkk isn't NULL. It is 234. You assigned it to 234.

If you do tonode(234) == NULL, you'll find that the result is 0 (false). If you do tonode(234) == 234, the result is 1 (true).

tonode(234) returns 234, not NULL.

Originally Posted by LINWEIXU

I do not konw why jjjj=234

A pointer is just a memory address. It is a number. jjjj is 234 because you assigned it to 234. When you set a treenode value, you are setting a number that is the memory address. If you explicitly set it to 234, then it is pointing at memory address 234.

using namespace std;
class Foo
{
};
int _tmain(int argc, _TCHAR* argv[])
{
	Foo* foo = new Foo();
	cout << foo << endl;
	foo = (Foo*) 9;
	cout << foo << endl;
	system("pause");
	return 0;
}

The above code is valid C++ and it works perfectly fine. Here's the output: