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#pragma once
#include <erebos/merge.h>
#include <erebos/storage.h>
namespace erebos
{
class SetViewBase;
template<class T> class SetView;
class SetBase
{
protected:
struct Priv;
SetBase();
SetBase(const vector<Ref> &);
SetBase(shared_ptr<const Priv>);
shared_ptr<const Priv> add(Storage &, const vector<Ref> &) const;
vector<vector<Ref>> toList() const;
public:
vector<Digest> digests() const;
protected:
shared_ptr<const Priv> p;
};
template<class T>
class Set : public SetBase
{
Set(shared_ptr<const Priv> p): SetBase(p) {};
public:
Set() = default;
Set(const vector<Ref> & refs): SetBase(move(refs)) {}
Set(const Set<T> &) = default;
Set(Set<T> &&) = default;
Set & operator=(const Set<T> &) = default;
Set & operator=(Set<T> &&) = default;
static Set<T> load(const vector<Ref> & refs) { return Set<T>(move(refs)); }
Set<T> add(Storage &, const T &) const;
template<class F>
SetView<T> view(F && cmp) const;
};
template<class T>
class SetView
{
public:
template<class F>
SetView(F && cmp, const vector<vector<Ref>> & refs);
typename vector<T>::const_iterator begin() const { return items.begin(); }
typename vector<T>::const_iterator end() const { return items.end(); }
private:
vector<T> items;
};
template<class T>
Set<T> Set<T>::add(Storage & st, const T & x) const
{
return Set<T>(SetBase::add(st, storedRefs(Mergeable<T>::components(x))));
}
template<class T>
template<class F>
SetView<T> Set<T>::view(F && cmp) const
{
return SetView<T>(std::move(cmp), toList());
}
template<class T>
template<class F>
SetView<T>::SetView(F && cmp, const vector<vector<Ref>> & refs)
{
items.reserve(refs.size());
for (const auto & crefs : refs) {
vector<Stored<typename Mergeable<T>::Component>> comps;
comps.reserve(crefs.size());
for (const auto & r : crefs)
comps.push_back(Stored<typename Mergeable<T>::Component>::load(r));
filterAncestors(comps);
items.push_back(Mergeable<T>::merge(comps));
}
std::sort(items.begin(), items.end(), cmp);
}
}
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