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#pragma once
#include <typeinfo>
#include <util/generic/hash.h>
#include <util/generic/vector.h>
#include <util/ysafeptr.h>
////////////////////////////////////////////////////////////////////////////////////////////////////
// factory is using RTTI
// objects should inherit T and T must have at least 1 virtual function
template <class T>
class TClassFactory {
public:
typedef const std::type_info* VFT;
private:
typedef T* (*newFunc)();
typedef THashMap<int, newFunc> CTypeNewHash; // typeID->newFunc()
typedef THashMap<VFT, int> CTypeIndexHash; // vftable->typeID
CTypeIndexHash typeIndex;
CTypeNewHash typeInfo;
void RegisterTypeBase(int nTypeID, newFunc func, VFT vft);
static VFT GetObjectType(T* pObject) {
return &typeid(*pObject);
}
int VFT2TypeID(VFT t) {
CTypeIndexHash::iterator i = typeIndex.find(t);
if (i != typeIndex.end())
return i->second;
for (i = typeIndex.begin(); i != typeIndex.end(); ++i) {
if (*i->first == *t) {
typeIndex[t] = i->second;
return i->second;
}
}
return -1;
}
public:
template <class TT>
void RegisterType(int nTypeID, newFunc func, TT*) {
RegisterTypeBase(nTypeID, func, &typeid(TT));
}
void RegisterTypeSafe(int nTypeID, newFunc func) {
TPtr<T> pObj = func();
VFT vft = GetObjectType(pObj);
RegisterTypeBase(nTypeID, func, vft);
}
T* CreateObject(int nTypeID) {
newFunc f = typeInfo[nTypeID];
if (f)
return f();
return nullptr;
}
int GetObjectTypeID(T* pObject) {
return VFT2TypeID(GetObjectType(pObject));
}
template <class TT>
int GetTypeID(TT* p = 0) {
(void)p;
return VFT2TypeID(&typeid(TT));
}
void GetAllTypeIDs(TVector<int>& typeIds) const {
typeIds.clear();
for (typename CTypeNewHash::const_iterator iter = typeInfo.begin();
iter != typeInfo.end();
++iter) {
typeIds.push_back(iter->first);
}
}
};
////////////////////////////////////////////////////////////////////////////////////////////////////
template <class T>
void TClassFactory<T>::RegisterTypeBase(int nTypeID, newFunc func, VFT vft) {
if (typeInfo.find(nTypeID) != typeInfo.end()) {
TObj<IObjectBase> o1 = typeInfo[nTypeID]();
TObj<IObjectBase> o2 = func();
// stupid clang warning
auto& o1v = *o1;
auto& o2v = *o2;
if (typeid(o1v) != typeid(o2v)) {
fprintf(stderr, "IBinSaver: Type ID 0x%08X has been already used\n", nTypeID);
abort();
}
}
CTypeIndexHash::iterator typeIndexIt = typeIndex.find(vft);
if (typeIndexIt != typeIndex.end() && nTypeID != typeIndexIt->second) {
fprintf(stderr, "IBinSaver: class (Type ID 0x%08X) has been already registered (Type ID 0x%08X)\n", nTypeID, typeIndexIt->second);
abort();
}
typeIndex[vft] = nTypeID;
typeInfo[nTypeID] = func;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// macro for registering CFundament derivatives
#define REGISTER_CLASS(factory, N, name) factory.RegisterType(N, name::New##name, (name*)0);
#define REGISTER_TEMPL_CLASS(factory, N, name, className) factory.RegisterType(N, name::New##className, (name*)0);
#define REGISTER_CLASS_NM(factory, N, name, nmspace) factory.RegisterType(N, nmspace::name::New##name, (nmspace::name*)0);
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