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#pragma once
#include <algorithm>
#include <functional>
#include <memory>
#include <type_traits>
#include <vector>
template<typename Ptr> class Collection {
public:
virtual ~Collection() = default;
using Object = Ptr::element_type;
using Objects = std::vector<Ptr>;
Collection &
operator=(Objects && other)
{
objects = std::move(other);
return *this;
}
const Ptr &
operator[](size_t idx) const
{
return objects[idx];
}
template<typename T = Object, typename... Params>
auto
create(Params &&... params)
requires std::is_base_of_v<Object, T>
{
if constexpr (requires(Ptr ptr) { ptr = std::make_shared<T>(std::forward<Params>(params)...); }) {
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());
});
}
[[nodiscard]] auto
begin() const
{
return objects.begin();
}
[[nodiscard]] auto
end() const
{
return objects.end();
}
[[nodiscard]] auto
rbegin() const
{
return objects.rbegin();
}
[[nodiscard]] auto
rend() const
{
return objects.rend();
}
[[nodiscard]] bool
empty() const
{
return objects.empty();
}
auto
emplace(Ptr && ptr)
{
return objects.emplace_back(std::move(ptr));
}
protected:
Objects objects;
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;
});
}
};
template<typename T> using SharedCollection = Collection<std::shared_ptr<T>>;
template<typename T> using UniqueCollection = Collection<std::unique_ptr<T>>;
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