Variable-Sized Array

[TechnoCat]

Is there a way to declare a two-dimensional array with two variables? I need to be able to pass the array back and forth between functions. I've tried using vectors and dynamic arrays, but I don't like them because I can't see the value of any one element using Xcode's debugger, which will make debugging a real pain.

[anonymous23323124]

Are you sure you can't see individual values? In Visual Studio you can click a plus icon to expand the vector and display its members. Are you sure this can't be done in XCode?

[TechnoCat]

You're right. I wrote a quick little test application, and sure enough, I can expand a 1D vector in the debugger and see its contents. So I rewrote it to use a 2D vector, and when I expand the outer vector I get a list of more vectors (as expected) . But when I expand any of those inner vectors, I get nothing. I'm not sure if this is a bug in Xcode; does it work in Visual Studio? To save time, you can just copy-paste this test code:

#include <iostream>
#include <vector>
using namespace std ;

int main (int argc, char * const argv[]) {
	vector <vector <long> > vector2D ;
	vector2D.resize (8) ;
	for (int i = 0 ; i <= 8 ; i ++ ) {
		vector2D [i] .resize (8) ;
		}
	
	for (int i = 0 ; i < 8 ; i ++ ) {
		for (int j = 0 ; j < 8 ; j ++ ) {
			vector2D [i] [j] = i * j ;
			}
		}
	
    return 0 ;
	}

[anonymous23323124]

I tried this test code:

#include <vector>

int main()
{
	std::vector<std::vector<int>> arr;
	arr.resize(8);
	for (unsigned i=0; i<8; i++)
		arr[i].resize(8);
	return 0;
}

In Visual Studio, both layers of array could be seen in the debugger.

[TechnoCat]

Hm. For some reason Xcode (gcc) didn't like the ">>" . I believe it said

'>>' should be '> >' within a nested template argument list

.

[filipe]

The reason being they're different tokens.