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Implement an allocator for types that cannot be constructed by script and must not be destructed by script.

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For cases where the actual instance is static and might outlive the VM itself.
This commit is contained in:
Sandu Liviu Catalin 2016-11-17 11:46:36 +02:00
parent 641e51e03c
commit 41f2971b7c
1 changed files with 83 additions and 0 deletions
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83
include/sqrat/sqratAllocator.h
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@ -463,6 +463,89 @@ public:
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// NoDestructor is the allocator to use for Class that can NOT be constructed, copied or destructed
///
/// \tparam C Type of class
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class NoDestructor {
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instance));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class (not allowed in this allocator)
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
#if !defined (SCRAT_NO_ERROR_CHECKING)
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" constructing is not allowed"))).c_str());
#else
SQUNUSED(vm);
return 0;
#endif
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type (not used in this allocator)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SQUNUSED(vm);
SQUNUSED(idx);
SQUNUSED(value);
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" cloning is not allowed"))).c_str());
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
// Only delete our pair instance and leave the actual instance untouched
//delete instance->first;
delete instance;
return 0;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// CopyOnly is the allocator to use for Class that can be copied but not constructed
///