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How to debug some complex c++ stls in watches of CodeBlocks? E.G. vector<vector<

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fruitshell:
I wrote a simple program concerning c++ stls. But I found that using CodeBlocks is very hard to debug with some kinds of a little more complex stls E.G. vector<vector >v. When I debug the program below with CodeBlocks, the watch of "v" looks like the picture below. However, I can watch vectorv1 and v2 just fine, which seems puzzling to me.


--- Code: ---#include <iostream>
#include<vector>
using namespace std;
vector<vector<int> >v;
vector<int>v1 = { 1,2,3 };
vector<int>v2 = { 4,5,6 };
int main()
{
    v.push_back(v1);
    v.push_back(v2);
    return 0;
}
--- End code ---
watches of CodeBlocks image link:https://1drv.ms/i/s!AvdYBfif1jy-nSVnbBsHrj7nSlrJ?e=0Tri3G

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