decorated_tuple::cow_ptr decorated_tuple::make(cow_ptr d, vector_type v) {
auto ptr = dynamic_cast<const decorated_tuple*>(d.get());
if (ptr) {
d = ptr->decorated();
auto& pmap = ptr->mapping();
for (size_t i = 0; i < v.size(); ++i) {
v[i] = pmap[v[i]];
}
}
return make_counted<decorated_tuple>(std::move(d), std::move(v));
}
inline bool operator==(const cow_ptr<X>& lhs, const cow_ptr<Y>& rhs) {
return lhs.get() == rhs.get();
}
cow_ptr(cow_ptr<Y> const& other) : m_ptr(const_cast<Y*>(other.get())) { }
cow_ptr(cow_ptr<Y> other) : m_ptr(other.get()) {
static_assert(std::is_convertible<Y*, T*>::value,
"Y* is not assignable to T*");
}
