Cast to result of whatis expression

Tom Tromey
Tue Sep 7 22:16:00 GMT 2010

>>>>> "Kenneth" == Kenneth Rose <> writes:

Kenneth> I'm writing something similar to gdb-stl-views for some custom
Kenneth> container classes that we have.

I think that these days it is better to use the Python pretty-printing
infrastructure instead.  It has a number of advantages -- it works no
matter how the object is printed (in a stack trace, embedded in some
other structure), and it works with MI.

Kenneth> I need to explicitly cast foo.m_x to the appropriate type, but
Kenneth> I'm at a loss as to how to get that type from gdb.  "whatis
Kenneth> foo" gives me back "Container<int>".  Is there anyway of
Kenneth> extracting the "int" part of that result and using that as the
Kenneth> type to cast to?

You can do this in Python :-)

You could probably do it (with some difficulty) using a combination of
logging, "shell", and "source".

Kenneth> I'm using the stock GDB that ships with Mac OS X 10.6 (GNU gdb
Kenneth> 6.3.50-20050815 (Apple version gdb-1461).  I know... it's old.

Ah, Apple's fork.  Unfortunately it is Python-free.

You could try GDB 7.2.  It has some known bugs on Mac OS, but I have
also heard reports of it work.


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