Don’t use raw pointers, use std::unique_ptr like this:
std::vector<std::unique_ptr<Fruit>> m_fruits;
And as you can’t copy construct a std::unique_ptr you must use emplace_back (although you can use push_back with std::move).
m_fruits.emplace_back(new Pear()); m_fruits.emplace_back(new Tomato());
Edit:
As it appears that using std::vector<std::unique_ptr<T>>::emplace_back and new can leak if the std::vector needs and fails to reallocate memory, my recommended approach (until C++14 introduces std::make_unique) is to use push_back like this:
m_fruits.push_back(std::unique_ptr<Fruit>(new Pear()));
m_fruits.push_back(std::unique_ptr<Fruit>(new Tomato()));
Or using std::make_unique:
m_fruits.push_back(std::make_unique<Pear>());
m_fruits.push_back(std::make_unique<Tomato>());