Can boost::smart_ptr such as scoped_ptr and shared_ptr be used in polymorphism?
class SomeClass
{
public:
SomeClass()
{
a_ptr.reset(new SubClass);
}
private:
boost::scoped_ptr<SuperClass> a_ptr;
}
I believe the answer is yes; boost pointers are coded such that derived classes are accepted wherever a superclass would be.
Yes:
#include <string>
#include <iostream>
using namespace std;
#include <boost\shared_ptr.hpp>
using namespace boost;
class Foo
{
public:
virtual string speak() const { return "Foo"; }
virtual ~Foo() {};
};
class Bar : public Foo
{
public:
string speak() const { return "Bar"; }
};
int main()
{
boost::shared_ptr<Foo> my_foo(new Bar);
cout << my_foo->speak();
}
Output is: Bar
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