Add Kernel + Physic Engine

source/utility/Identifiable.cpp

+#include "Identifiable.hpp"
+
+namespace megu {
+    size_t Identifiable::_GlobalId = 0;
+
+    Identifiable::Identifiable()
+    : _id(Identifiable::_GlobalId++) {}
+
+    Identifiable::Identifiable(size_t id)
+    : _id(id) {}
+
+    Identifiable::Identifiable(const Identifiable & src)
+    : _id(src._id) {}
+
+    Identifiable::~Identifiable() {
+        --Identifiable::_GlobalId;
+    }
+
+    bool Identifiable::operator==(const Identifiable & identifiable) const {
+        return this->_id == identifiable._id;
+    }
+
+    bool Identifiable::operator!=(const Identifiable & identifiable) const {
+        return !(*this == identifiable);
+    }
+
+    bool Identifiable::operator<=(const Identifiable & identifiable) const {
+        return this->_id <= identifiable._id;
+    }
+
+    bool Identifiable::operator>=(const Identifiable & identifiable) const {
+        return this->_id <= identifiable._id;
+    }
+
+    bool Identifiable::operator<(const Identifiable & identifiable) const {
+        return !(this->_id >= identifiable._id);
+    }
+
+    bool Identifiable::operator>(const Identifiable & identifiable) const {
+        return !(this->_id <= identifiable._id);
+    }
+}
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source/utility/Identifiable.hpp

+#pragma once
+
+#include <map>
+#include <stddef.h>
+
+namespace megu {
+    class Identifiable {
+        public:
+            Identifiable();
+            Identifiable(size_t);
+            Identifiable(const Identifiable &);
+   virtual ~Identifiable();
+
+            inline size_t id() const {return this->_id;}
+            inline void setId(size_t id) {this->_id = id;}
+
+            bool operator==(const Identifiable &) const;
+            bool operator!=(const Identifiable &) const;
+            bool operator>=(const Identifiable &) const;
+            bool operator<=(const Identifiable &) const;
+            
+            bool operator>(const Identifiable &) const;
+            bool operator<(const Identifiable &) const;
+
+        private:
+            size_t _id;
+            static size_t _GlobalId;
+    };
+    
+    template <class T>
+    using Identifiable_Map = std::map<size_t, T *>;
+
+    template <class T>
+    class Identifiable_Unique : public Identifiable {};
+}
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