Re: // how can I access A::a?
On 2011-04-12 13:34:19 -0400, Victor Bazarov said:
On 4/12/2011 7:38 AM, Pete Becker wrote:
On 2011-04-11 18:52:40 -0400, dick said:
/* multi_level_inheritance.cpp */
struct A
{
int a;
};
struct B1 : public A
{
int a;
};
struct B2 : public A
{
int a;
};
struct C : public B1, public B2
{
int a;
};
int main()
{
C ccc;
ccc.a=123;
ccc.B1::a=456;
/* 0030 */ ccc.B1::A::a=789;
}
// c++ multi_level_inheritance.cpp
// multi_level_inheritance.cpp: In function int main():
// multi_level_inheritance.cpp:30: error: A is an ambiguous base of C
// how can I access A::a?
There are two A::a's, which is why the error message said that the
reference to A is ambiguous. You need to decide which one you want to
access, then name it. Hint: there's one in B1 and one in B2.
And does the fact that the OP specifically used 'B1::' before 'A::a'
matter not?
Sure, but you're giving away the ending. There's clearly a problem in
the line ccc.a = 123; so it's not at all likely that the only error
message came from the line marked /* 0030 */.
On the other hand, it does help to carefully read the code in question. :-(
--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)