Hi all, I'm new to Boost and have some questions about how to get data out
of a vector > container. For this purpose I put together
'class Base' which holds a vector >
Pointers. I wrote a function template to insert pointers, but I have real
difficulty extracting pointers. For example, if I insert 3 Base* pointers
and 2 DerivedBase* pointers, I need to be able to extract the 3 Base *
pointers and the 2 DerivedBase* pointers at a later point in time. To this
end, class Base* has another member function 'template< typename C> int
numPointer( C * InPointer)' which is intended to count the number of
pointers found in the container.
template< typename C> int numPointer(C* InPointer) has a few problems: 1)
typeid(Pointers[i]) returns the 'variant' typeid when I really need to know
the typeid of the ith pointer in 'Pointers'. 2) There must be a better, more
elegant (and safe) way to make use of the boost library to accomplish just
what I want.
int main() {
Base * TempBase = new Base();
DerivedBase * TempDeri = new DerivedBase();
TempBase->insert(TempBase);
TempBase->insert(TempBase);
TempBase->insert(TempDeri);
std::cout << "Base:" << TempBase->numPointer(TempBase) << endl;
//Expect "Base:2" get "Base:0" because of typeid().
std::cout << "Deri:" << TempBase->numPointer(TempDeri) << endl; //Expect
"Deri:1" get "Deri:0" because of typeid().
}
class Base {
private:
vector > Pointers;
public:
Base();
virtual ~Base();
template <typename C> void insert( C * inC )
{
Pointers.push_back(inC);
}
template <typename C> int numPointer( C* inC ) {
int counter(0);
for ( int i(0); i < int(Pointers.size()); i++ ) {
cout << "type:" << typeid(inC).name() << endl;
cout << "typeP:" << typeid(Pointers[i]).name() << endl; //Will give the id
of the container not Pointer[i].
//if( boost::is_same::value ){ //Compilation
error
if ( typeid(inC).name() == typeid(Pointers[i]).name() ) {
counter++;
}
}
return counter;
}
}; //Base
Any advice on how to improve this code and/or make better use of the boost
library is fully appreciated.
Thanks,
Matt
