Tom Tromey wrote:
>>>>>> "Pedro" == Pedro Alves <alves.ped@gmail.com> writes:
>>>>>>             
>
> Pedro> Does this do sensible things if class Y has some
> Pedro> fields that mask the Base class's ones, when you only have a
> Pedro> pretty printer for Base?
>
> Yeah... it pretty-prints Base, then goes on to print the subclass
> fields as usual (perhaps pretty-printing them as well).
>
> Phil, could you post the before- and after- results of your example?
> I think that would clear things up.
>   
Here (attached) is a file I was using today to test some scenarios. They 
do not directly address Pedro's questions (I think your explanation 
does). But they do address on of Paul's.

[pmuldoon@localhost gdb]$ ./gdb ~/derived

(pg-gdb) b 45
Reading in symbols for /home/pmuldoon/derived.cpp...
Breakpoint 1 at 0x400b40: file /home/pmuldoon/derived.cpp, line 45.
(pg-gdb) python import gdb.libstdcxx.v6.printers
(pg-gdb) r

Breakpoint 1, main () at /home/pmuldoon/derived.cpp:45
45 return 0;

(pg-gdb) info locals

map = std::map with 1 elements = {
[0x40363d "one"] = 1
}
uomap = std::tr1::unordered_map with 1 elements = {
[21] = 0x403645 "twenty one"
}
nest = {
<Z> = std::map with 1 elements = {
[0x403650 "twenty-two"] = 22
},
members of X:
map = std::tr1::unordered_map with 1 elements = {
[23] = 0x403638 "test"
},
i = 0
}
base = std::map with 1 elements = {
[0x403641 "two"] = 2
}