gdb.info: Breakpoint Menus

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Some programming languages (notably C++ and Objective-C) permit a
single function name to be defined several times, for application in
different contexts.  This is called "overloading".  When a function
name is overloaded, `break FUNCTION' is not enough to tell GDB where
you want a breakpoint.  If you realize this is a problem, you can use
something like `break FUNCTION(TYPES)' to specify which particular
version of the function you want.  Otherwise, GDB offers you a menu of
numbered choices for different possible breakpoints, and waits for your
selection with the prompt `>'.  The first two options are always `[0]
cancel' and `[1] all'.  Typing `1' sets a breakpoint at each definition
of FUNCTION, and typing `0' aborts the `break' command without setting
any new breakpoints.
   For example, the following session excerpt shows an attempt to set a
breakpoint at the overloaded symbol `String::after'.  We choose three
particular definitions of that function name:
     (gdb) b String::after
     [0] cancel
     [1] all
     [2] file:String.cc; line number:867
     [3] file:String.cc; line number:860
     [4] file:String.cc; line number:875
     [5] file:String.cc; line number:853
     [6] file:String.cc; line number:846
     [7] file:String.cc; line number:735
     > 2 4 6
     Breakpoint 1 at 0xb26c: file String.cc, line 867.
     Breakpoint 2 at 0xb344: file String.cc, line 875.
     Breakpoint 3 at 0xafcc: file String.cc, line 846.
     Multiple breakpoints were set.
     Use the "delete" command to delete unwanted
      breakpoints.
     (gdb)