On Thu, Sep 4, 2008 at 11:31 PM, wrote:

Hi all,

I'm having trouble using GDB with my program that uses boost. In GDB (bra is a vector<double>):

(gdb) print bra(j) Invalid data type for function to be called.

I've compiled my program with -g3. How can I peek at boost datatypes?

I don't think this has got anything to do with boost library. If bra is a vector<double> then you cannot print it like that. The following seems to work. (gdb) print bra $1 = {<_Vector_base> = { _M_impl = { = { = {<No data fields>}, <No data fields>}, _M_start = 0x631b58, _M_finish = 0x631b80, _M_end_of_storage = 0x631b98}}, <No data fields>} (gdb) print {double}(0x631b58+0*sizeof(double)) $2 = 33.329999999999998 (gdb) print {double}(0x631b58+1*sizeof(double)) $3 = 34.439999999999998 (gdb) print {double}(0x631b58+2*sizeof(double)) $4 = 35.549999999999997 (gdb) After printing the vector object, I obtain the start address of the data. Then I access the elements using the offsets. But this approach seems to be tedious. Is there any better approach? Ideally speaking, gdb should be able to work with "print bra.at(0)" or "print bra[0]". But currently that is not working. Maybe newer versions of gdb will improve C++ support! $ gdb --version GNU gdb 6.8.0.20080328-cvs (cygwin-special) Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-pc-cygwin". $ Rgds, anna -- Abusive Language on Internet http://missingrainbow.blogspot.com/2008/08/abusive-language-on-internet.html