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#pragma once
#include <algorithm>
#include <functional>
#include <memory>
#include <type_traits>
#include <vector>
template<typename Ptr, typename... Others> class Collection {
public:
virtual ~Collection() = default;
using Object = Ptr::element_type;
using Objects = std::vector<Ptr>;
template<typename T> using OtherObjects = std::vector<T *>;
Collection &
operator=(Objects && other)
{
objects = std::move(other);
((std::get<OtherObjects<Others>>(otherObjects).clear()), ...);
for (const auto & other : objects) {
addOthersPtr(other.get());
}
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);
addOthersType<T>(obj.get());
return obj;
}
else {
auto obj = static_cast<T *>(
objects.emplace_back(std::make_unique<T>(std::forward<Params>(params)...)).get());
addOthersType<T>(obj);
return obj;
}
}
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();
}
decltype(auto)
emplace(Ptr && ptr)
{
const auto & object = objects.emplace_back(std::move(ptr));
addOthersPtr(object.get());
return object;
}
protected:
Objects objects;
std::tuple<OtherObjects<Others>...> otherObjects;
template<typename T>
void
addOthersType(T * obj)
{
applyToOthersType<T>(
[](auto & others, auto ptr) {
others.emplace_back(ptr);
},
obj);
}
void
addOthersPtr(Object * obj)
{
applyToOthersPtr(
[](auto & others, auto ptr) {
others.emplace_back(ptr);
},
obj);
}
template<typename T>
requires(sizeof...(Others) == 0)
void
applyToOthersType(const auto &, T *)
{
}
void
applyToOthersPtr(const auto &, Object *)
requires(sizeof...(Others) == 0)
{
}
template<typename T>
requires(sizeof...(Others) > 0)
void
applyToOthersType(const auto & func, T * obj)
{
(
[&]() {
if constexpr (std::is_convertible_v<T *, Others *>) {
std::invoke(func, std::get<OtherObjects<Others>>(otherObjects), obj);
}
}(),
...);
}
void
applyToOthersPtr(const auto & func, Object * obj)
requires(sizeof...(Others) > 0)
{
(
[&]() {
if (auto ptr = dynamic_cast<Others *>(obj)) {
std::invoke(func, std::get<OtherObjects<Others>>(otherObjects), ptr);
}
}(),
...);
}
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, typename... Others> using SharedCollection = Collection<std::shared_ptr<T>, Others...>;
template<typename T, typename... Others> using UniqueCollection = Collection<std::unique_ptr<T>, Others...>;
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