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component.h
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component.h
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/*
* AsyncECS
* Copyright (c) 2018 kamxgal Kamil Galant [email protected]
*
* MIT licence
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#pragma once
#include <memory>
namespace ecs
{
struct component;
using component_tag = unsigned int;
using component_const_ptr = std::shared_ptr<const component>;
using component_ptr = std::shared_ptr<component>;
struct component
{
private:
template<class T>
struct RegisteredComponents {
static bool is_registered;
static component_tag tag;
};
public:
virtual ~component() = default;
template<class T>
static component_tag tag_t() {
assert(RegisteredComponents<T>::is_registered);
return RegisteredComponents<T>::tag;
}
template<class T>
void register_t() {
if (RegisteredComponents<T>::is_registered) {
return;
}
RegisteredComponents<T>::is_registered = true;
RegisteredComponents<T>::tag = ++mNextAvailableTag;
RegisteredComponents<const T>::is_registered = true;
RegisteredComponents<const T>::tag = mNextAvailableTag;
}
virtual component_tag tag() const = 0;
protected:
void clone_private_data(component_ptr c) const;
private:
static component_tag mNextAvailableTag;
size_t mRevision = 0;
friend struct entity;
};
template<class T> bool component::RegisteredComponents<T>::is_registered = false;
template<class T> component_tag component::RegisteredComponents<T>::tag = 0;
#define ECS_COMPONENT(NAME) \
NAME() { \
component::register_t<NAME>(); \
} \
~NAME() override = default; \
ecs::component_tag tag() const override { \
return component::tag_t<NAME>(); \
} \
public: \
NAME clone() const { \
return *this; \
}
} // namespace ecs