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// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
* Copyright 2010 Inalogic® Inc.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, as
* published by the Free Software Foundation; either version 2.1 or 3.0
* of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>
*
* Authored by: Jay Taoko <jaytaoko@inalogic.com>
*
*/
#ifndef NOBJECTTYPE_H
#define NOBJECTTYPE_H
#include <string>
namespace nux
{
// TODO: write a nice is_instance (and is_derived_instance)
//template <typename T, typename I>
//bool is_instance(T const&
struct NObjectType
{
const char* name;
NObjectType* super;
static const NObjectType Null_Type;
NObjectType()
: name("Null_Type")
, super(nullptr)
{
}
NObjectType(const char* type_name, NObjectType* super_type)
: name(type_name)
, super(super_type)
{
}
//! Return true is this has the same type as the argument type.
inline bool operator == (const NObjectType &Type) const
{
return IsObjectType (Type);
}
//! Return true is this has is of a different type than the argument type.
inline bool operator != (const NObjectType &Type) const
{
return !IsObjectType (Type);
}
//! Return true is this has the same type as the argument type.
inline bool IsObjectType (const NObjectType &Type) const
{
return this == &Type;
}
//! Return true if this has the same type as the argument type or is derived from it.
inline bool IsDerivedFromType (const NObjectType &Type) const
{
const NObjectType *current_type = this;
while (current_type)
{
if (current_type == &Type)
return true;
current_type = current_type->super;
}
return false;
}
inline unsigned int SubClassDepth() const
{
const NObjectType* current_type = this;
unsigned int depth = 0;
while (current_type)
{
depth++;
current_type = current_type->super;
}
return depth;
}
};
#define NUX_DECLARE_OBJECT_TYPE(TypeName, SuperType) \
public: \
typedef SuperType SuperObject; \
static ::nux::NObjectType StaticObjectType; \
public: \
virtual ::nux::NObjectType& Type() const { return StaticObjectType; } \
::nux::NObjectType& GetTypeInfo() const { return StaticObjectType; }
#define NUX_IMPLEMENT_OBJECT_TYPE(TypeName) \
::nux::NObjectType TypeName::StaticObjectType(#TypeName, &TypeName::SuperObject::StaticObjectType);
#define NUX_DECLARE_ROOT_OBJECT_TYPE(TypeName) \
public: \
typedef ::nux::NObjectType SuperObject; \
static ::nux::NObjectType StaticObjectType; \
public: \
virtual ::nux::NObjectType& Type() const { return StaticObjectType; } \
::nux::NObjectType& GetTypeInfo() const { return StaticObjectType; }
#define NUX_IMPLEMENT_ROOT_OBJECT_TYPE(TypeName) \
::nux::NObjectType TypeName::StaticObjectType(#TypeName, 0);
} // namespace nux
#endif // NOBJECTTYPE_H
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