dwhitney67
April 25th, 2009, 09:52 PM
I agree; gdb is less than useful when attempting to analyze the contents of and STL container.
However, I just tested a simple program with the debugger to see if I could display the contents of an int vector, and sure enough, it is possible.
Here's the code:
#include <vector>
#include <iostream>
#include <algorithm>
template <typename T>
void display(const T& value)
{
std::cout << value << " ";
}
int main()
{
std::vector<int> vec;
vec.push_back(10);
vec.push_back(20);
vec.push_back(30);
std::for_each(vec.begin(), vec.end(), display<int>);
std::cout << std::endl;
}
To display the int values in the vector, I issued the following ddd (actually, gdb) command to display the first element in the vector:
(gdb) p *(vec._M_impl._M_start + 0)
To display the other two values, I merely changed the index to 1 and 2, respectively.
Now, a vector is a trivial container than, say, an STL map. Thus I do not know if such a scheme can be used for other containers.