erros in debugging

[nanger]

void make_random_neighbourhood(POverlay po, size_t degree)
{
	size_t n = po->num_peers();
	for (size_t i = 0; i < n; i++) {
		size_t k = 0;
		while (k < degree){		
			size_t j = (size_t)floor(uniform (0, n, &gSeed));
			if (i != j) {
				k++;
				if (po->find_link (i, j) == NULL){
					po->add_link (i, j);
					po->add_link (j, i);
				}
			}
		}
	}	
}

the errors in debugging are:

No symbol "j" in current context.
No symbol "n" in current context.


but actually these two functions below are called and I found n=1000
when stepping into floor(uniform (0, n, &gSeed)), which means that
n has been assigned a correct value

size_t n = po->num_peers();
size_t j = (size_t)floor(uniform (0, n, &gSeed))

when step to the statement
po->add_link (i, j);
the fatal error arise:

No source available for "std::_Rb_tree_decrement() "

what is the reason?

thanks!

[PanGalactic]

Are you asking why you don't have source for a C++ standard library internal function?

[nanger]

no, in fact, the program was successful before I modify other classes, which I believe has no association with these related function.
I don't know why in the debugging there are such errors as below:

No symbol "j" in current context.
No symbol "n" in current context.

[helios]

My guess is that you're too deep in the call stack.

[PanGalactic]

What level optimization level did you compile at? The compiler will frequently elide local variables, assigning them directly to CPU registers.