Using GDB, I want to access member variable pointers of an element in a map to inspect values of the object referred by the said pointer.
Consider the below program.
#include <iostream>
#include <map>
struct Parent
{
std::string phone_number;
Parent(std::string num): phone_number(num){}
};
struct Student
{
int student_id;
std::string student_name;
Parent* parent = nullptr;
Student(int id, std::string name):student_id(id), student_name(name) {}
};
int main()
{
Parent* p_tim = new Parent("0712323456");
Parent* p_tom = new Parent("0112122123");
Student ann(1, "Anne");
Student bobby(2, "Bobby");
ann.parent = p_tim;
bobby.parent = p_tom;
std::map<std::string, Student> students;
students.insert(std::make_pair("ann", ann));
students.insert(std::make_pair("bob", bobby));
for(auto student:students)
{
std::cout << "Student: ID = " << student.second.student_id << " and Name: " << student.second.student_name << std::endl;
}
return 0;
}
I can view the contents of the map using the following command.
(gdb) p students
$1 = std::map with 2 elements = {["ann"] = {student_id = 1,
student_name = "Anne", parent = 0xa85ed0}, ["bob"] = {student_id = 2,
student_name = "Bobby", parent = 0xa85f20}}
I want to inspect the parent object inside a single element in the map. For example, I want to inspect the phone number of ann's parent from this map. But I cant access it like below.
(gdb) p students["ann"].parent->phone_number
Could not find operator[].
Can you please let me know how this is done in GDB?
I think it should be possible(from command line GDB) because the visual debugger in VS Code shows this information.
