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#pragma once
#include <algorithm>
#include <memory>
#include <type_traits>
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, typename M = void, typename... Params>
auto
apply(const M & m, Params &&... params) const
{
return std::count_if(objects.begin(), objects.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 M = void, typename... Params>
auto
applyOne(const M & m, Params &&... params) const
{
return std::find_if(objects.begin(), objects.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 = Object>
void
removeAll()
{
objects.erase(std::remove_if(objects.begin(), objects.end(),
[](auto && op) {
return dynamic_cast<T *>(op.get());
}),
objects.end());
}
auto
end() const
{
return objects.end();
}
};
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