bug in trace D'tor of parent class

[jackandking]

[code]
#include <iostream>
class A
{
public:
    A(){}
    ~A(){std::cout << "~A()" <<std::endl;}
};
class B :public A
{
public:
    B(){}
    ~B(){std::cout << "~B()" <<std::endl;}
};
main()
{
    A a;
    B b;
}
[/code]

run output:

#> ./a.out
~B()
~A()
~A()


gdb output:

#>gdb a.out
(gdb) b A::~A()
Breakpoint 1 at 0x8048780: file testdtor.cpp, line 23.
(gdb) b B::~B()
Breakpoint 2 at 0x80487c4: file testdtor.cpp, line 29.
(gdb) r
Starting program: /home/jfg748/test/a.out

Breakpoint 2, ~B (this=0xbfffa370) at testdtor.cpp:29
29          ~B(){std::cout << "~B()" <<std::endl;}
(gdb) c
Continuing.
~B()
~A()

Breakpoint 1, ~A (this=0xbfffa380) at testdtor.cpp:23
23          ~A(){std::cout << "~A()" <<std::endl;}
(gdb)
Continuing.
~A()

Program exited normally.
(gdb)


question:
why Breakpoint 1 only be triggered once?
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