clear_allocator.cc [plain text]
#include <vector>
#include <ext/new_allocator.h>
using namespace std;
using __gnu_cxx::new_allocator;
template<typename T>
class clear_alloc : public new_allocator<T>
{
public:
template <typename T1>
struct rebind
{ typedef clear_alloc<T1> other; };
virtual void clear() throw()
{ }
clear_alloc() throw()
{ }
clear_alloc(clear_alloc const& _wa) throw()
{ }
template<typename T1>
clear_alloc(clear_alloc<T1> const& _wa) throw()
{ }
virtual ~clear_alloc() throw()
{ this->clear(); }
T* allocate(typename new_allocator<T>::size_type n, const void *hint = 0)
{
this->clear();
return new_allocator<T>::allocate(n, hint);
}
void deallocate(T *ptr, typename new_allocator<T>::size_type n)
{
this->clear();
new_allocator<T>::deallocate(ptr, n);
}
};
template<typename Container>
void Check_Container()
{
Container* pic = new Container;
int x = 230;
while (x--)
{
pic->push_back(x);
}
pic->get_allocator();
pic->clear();
delete pic;
}
int main()
{
Check_Container<std::vector<bool, clear_alloc<bool> > >();
return 0;
}