MRObjectFactory.h

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#pragma once
 
#include "MRMeshFwd.h"
#include <memory>
#include <string>
 
namespace MR
{
 
 
MRMESH_API std::shared_ptr<Object> createObject( const std::string & className );
 
#define MR_ADD_CLASS_FACTORY( className ) \
    static MR::ObjectFactory<className> className##_Factory_{ #className };
 
using ObjectMakerFunc = std::shared_ptr<Object>();
 
class ObjectFactoryBase
{
public:
    MRMESH_API ObjectFactoryBase( std::string className, ObjectMakerFunc * creator );
    MRMESH_API ~ObjectFactoryBase();
 
private:
    std::string className_;
};
 
template<typename T>
class ObjectFactory : public ObjectFactoryBase
{
public:
    static_assert( std::is_base_of_v<Object, T>, "MR::Object is not base of T" );
 
    ObjectFactory( std::string className ) 
        : ObjectFactoryBase( std::move( className ), 
            []() { return std::static_pointer_cast<Object>( std::make_shared<T>() ); } ) 
    { }
};
 
 
} // namespace MR