how to print std::map value in gdb

Question

Hi all

I have a std::map< std::string, std::string> cont;

I want to see cont[ "some_key" ] in gdb. When I'm trying

p cont[ "some_ket" ]

I'm getting this message: One of the arguments you tried to pass to operator[] could not be converted to what the function wants.

I'm using GNU gdb Red Hat Linux (6.3.0.0-1.162.el4rh). Thanks

Answer 1

Gdb doesn't understand C++ operator overloading.

Answer 2

You can write your own dump functions and call them:

(gdb) call dump(m)

see this thread: http://www.mail-archive.com/[email protected]/msg02109.html

I'm curious about the GDB helper macros.

Answer 3

The latest gdb has python support baked in so one could easily write a function to print out the contents of any stl structure. However you'd have to learn the API and write the script. Luckily gcc 4.5 will ship with the needed python scripts to get gdb to intelligently handle stl data structures.

EDIT: you don't have to wait for GCC 4.5 (which by the way has already been released), you can just grab the code from SVN.