forked from mirror/openmw-tes3mp
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
#ifndef AISTATE_H
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#define AISTATE_H
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#include <typeinfo>
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#include <stdexcept>
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// c++11 replacement
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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/// \brief stores an object of any class derived from Base
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template< class Base >
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class DerivedClassStorage
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{
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private:
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Base* mStorage;
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// assert that Derived is derived from Base.
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template< class Derived >
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void assert_derived()
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{
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// c++11:
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// static_assert( std::is_base_of<Base,Derived> , "DerivedClassStorage may only store derived classes" );
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// boost:
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BOOST_STATIC_ASSERT(boost::is_base_of<Base,Derived>::value);//,"DerivedClassStorage may only store derived classes");
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}
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DerivedClassStorage( const DerivedClassStorage& );
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public:
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/// \brief returns reference to stored object or deletes it and creates a fitting
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template< class Derived >
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Derived& get()
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{
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assert_derived<Derived>();
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Derived* result = dynamic_cast<Derived*>(mStorage);
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if(!result)
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{
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if(mStorage)
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delete mStorage;
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mStorage = result = new Derived();
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}
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//return a reference to the (new allocated) object
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return *result;
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}
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template< class Derived >
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void store( const Derived& payload )
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{
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assert_derived<Derived>();
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if(mStorage)
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delete mStorage;
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mStorage = new Derived(payload);
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}
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/// \brief takes ownership of the passed object
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template< class Derived >
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void moveIn( Derived* p )
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{
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assert_derived<Derived>();
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if(mStorage)
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delete mStorage;
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mStorage = p;
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}
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/// \brief gives away ownership of object. Throws exception if storage does not contain Derived or is empty.
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template< class Derived >
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Derived* moveOut()
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{
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assert_derived<Derived>();
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if(!mStorage)
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throw std::runtime_error("Cant move out: empty storage.");
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Derived* result = dynamic_cast<Derived*>(mStorage);
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if(!mStorage)
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throw std::runtime_error("Cant move out: wrong type requested.");
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return result;
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}
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bool empty() const
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{
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return mStorage == NULL;
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}
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const std::type_info& getType() const
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{
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return typeid(mStorage);
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}
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DerivedClassStorage():mStorage(NULL){};
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~DerivedClassStorage()
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{
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if(mStorage)
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delete mStorage;
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};
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};
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namespace MWMechanics
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{
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/// \brief base class for the temporary storage of AiPackages
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struct AiTemporaryBase
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{
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virtual ~AiTemporaryBase(){};
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};
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/// \brief Container for AI package status
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typedef DerivedClassStorage<AiTemporaryBase> AiState;
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}
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#endif // AISTATE_H
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