CODEWITHSUNDEEP
c++gdb
Apoorva sahay
Apoorva sahay

Reputation: 1930

How to get value of a data member in gdb?

Hi I am currently debugging my code base in linux machine through GDB. I am currently facing an issue in getting value of a data member from object ptr of a class. To print the location for object ptr we can use either "p" (print) or "display" command.

For Eg: I have class like this

class abc
{
    string a;
};

So in my code if I am using a pointer for class abc, then 

abc* objPtr = new abc();

so after breaking at above line i will get objPtr and now I want to check value of datamember a (abc::a) value. how I could do that?

(gdb) p objPtr
$2 = {px = 0x3ba6430690, pn = {pi_ = 0x3ba6430698}}

Moreover Is there a different way to check a data member which is a list / vector ?

Upvotes: 5

Views: 7685

Answers (3)

SunDontShine
SunDontShine

Reputation: 158

p objPtr->a

will print the data member type and value of variable a

Upvotes: 0

Apoorva sahay
Apoorva sahay

Reputation: 1930

I got the answer. 

$p/a objPtr->datamember->[if datamember also has some data member then we can call it in recurcion / can also call member function].

for list/vector we could refer to http://sourceware.org/ml/gdb/2008-02/msg00064/stl-views.gdb.

Upvotes: 2

unwind
unwind

Reputation: 399871

You can try:

$ p abc->c_str()

Upvotes: 0

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