Hello , I am using boost 1.41 with gcc 3.4 (I know it's pretty old) , I
am having problem with "is_virtual_base_of"
The following lines of code will reproduce the problem. Thank you very much
Joseph
======== test_typetrait.cpp ==============
#include <iostream>
#include
class Fruit
{
};
class Apple : virtual public Fruit
{
};
int main(int argc,char** argv)
{
std::cout << std::endl << boost::is_virtual_base_of< Fruit,
Apple>::value << std::endl;
return 0;
}
======== full Compile warning ==============
include/boost/type_traits/is_virtual_base_of.hpp:
In instantiation of `boost::detail::is_virtual_base_of_impl >::X':
include/boost/type_traits/is_virtual_base_of.hpp:70:
instantiated from `boost::detail::is_virtual_base_of_impl >'
include/boost/type_traits/is_virtual_base_of.hpp:78:
instantiated from `boost::detail::is_virtual_base_of_impl2'
include/boost/type_traits/is_virtual_base_of.hpp:87:
instantiated from `boost::is_virtual_base_of'
test_typetrait.cpp:119:
instantiated from here
include/boost/type_traits/is_virtual_base_of.hpp:56:
warning: direct base `Fruit' inaccessible in
`boost::detail::is_virtual_base_of_impl
::X' due to ambiguity
