view.hpp

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#pragma once
 
#include <algorithm>
#include <vector>
 
#include "entity.hpp"
 
namespace Easys {
 
// TODO: We could store a ref to ecs for convenient view member functions, but im not sure this is the right approach.
 
// template <typename ECSType, typename... ComponentTypes>
 
class View {
   private:
    // ECSType& ecs;
    std::vector<Easys::Entity> entities;
 
   public:
    explicit View(std::vector<Easys::Entity> ents) noexcept : entities(std::move(ents)) {}
 
    // explicit View(ECSType& ecs) noexcept : ecs(ecs), entities(ecs.getEntities<ComponentTypes...>()) {}
 
    View(View&&) noexcept = default;
    View& operator=(View&&) noexcept = default;
 
    View(const View&) = default;
    View& operator=(const View&) = default;
 
    auto begin() noexcept { return entities.begin(); }
    auto end() noexcept { return entities.end(); }
 
    auto begin() const noexcept { return entities.begin(); }
    auto end() const noexcept { return entities.end(); }
 
    const auto& data() const noexcept { return entities; }
 
    size_t size() const noexcept { return entities.size(); }
 
    bool empty() const noexcept { return entities.empty(); }
 
    auto find(Entity e) const noexcept { return std::find(entities.begin(), entities.end(), e); }
 
    bool contains(Entity e) const noexcept { return find(e) != entities.end(); }
};
 
}  // namespace Easys