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#pragma once
#include <algorithm>
#include <functional>
#include <memory>
#include <type_traits>
#include <vector>
template<typename Object, bool shared = true> class Collection {
public:
virtual ~Collection() = default;
using Ptr = std::conditional_t<shared, std::shared_ptr<Object>, std::unique_ptr<Object>>;
using Objects = std::vector<Ptr>;
Objects objects;
template<typename T = Object, typename... Params>
auto
create(Params &&... params)
requires std::is_base_of_v<Object, T>
{
if constexpr (shared) {
auto obj = std::make_shared<T>(std::forward<Params>(params)...);
objects.emplace_back(obj);
return obj;
}
else {
return static_cast<T *>(objects.emplace_back(std::make_unique<T>(std::forward<Params>(params)...)).get());
}
}
template<typename T = Object>
T *
find()
{
if (auto i = std::find_if(objects.begin(), objects.end(),
[](auto && o) {
return (dynamic_cast<T *>(o.get()));
});
i != objects.end()) {
return static_cast<T *>(i->get());
}
return nullptr;
}
template<typename T = Object, typename... Params>
auto
findOrCreate(Params &&... params)
requires std::is_base_of_v<Object, T>
{
if (auto o = find<T>()) {
return o;
}
return create<T>(std::forward<Params>(params)...).get();
}
template<typename T = Object, typename... Params>
auto
apply(const auto & m, Params &&... params) const
{
return apply_internal<T>(objects.begin(), objects.end(), m, std::forward<Params>(params)...);
}
template<typename T = Object, typename... Params>
auto
rapply(const auto & m, Params &&... params) const
{
return apply_internal<T>(objects.rbegin(), objects.rend(), m, std::forward<Params>(params)...);
}
template<typename T = Object, typename... Params>
auto
applyOne(const auto & m, Params &&... params) const
{
return applyOne_internal<T>(objects.begin(), objects.end(), m, std::forward<Params>(params)...);
}
template<typename T = Object, typename... Params>
auto
rapplyOne(const auto & m, Params &&... params) const
{
return applyOne_internal<T>(objects.rbegin(), objects.rend(), m, std::forward<Params>(params)...);
}
template<typename T = Object>
auto
removeAll()
{
return std::erase_if(objects, [](auto && op) {
return dynamic_cast<T *>(op.get());
});
}
auto
end() const
{
return objects.end();
}
auto
rend() const
{
return objects.rend();
}
protected:
template<typename T = Object, typename... Params>
auto
apply_internal(const auto begin, const auto end, const auto & m, Params &&... params) const
{
return std::count_if(begin, end, [&m, ¶ms...](auto && op) {
if (auto o = dynamic_cast<T *>(op.get())) {
std::invoke(m, o, std::forward<Params>(params)...);
return true;
}
return false;
});
}
template<typename T = Object, typename... Params>
auto
applyOne_internal(const auto begin, const auto end, const auto & m, Params &&... params) const
{
return std::find_if(begin, end, [&m, ¶ms...](auto && op) {
if (auto o = dynamic_cast<T *>(op.get())) {
return std::invoke(m, o, std::forward<Params>(params)...);
}
return false;
});
}
};
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