1. Printing type of variable: ptype <VARIABLE_SYMBOL>
   • For class objects, prints the signature of the whole class

2. Printing a vector: p[rint] <VECTOR>

3. Printing an element in a vector:
   • Often operator[] or at() method don’t work in gdb
   • Instead, use <VECTOR>._M_impl._M_start+<INDEX>
   • This will return the pointer to the target element in the underlying array, so dereferencing the pointer would give the element

References:

• https://stackoverflow.com/a/30921053
• https://sourceware.org/gdb/current/onlinedocs/gdb/Symbols.html
• https://stackoverflow.com/a/2123260
• https://stackoverflow.com/a/47153592