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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
#include "FN_cpp_type.hh"
namespace blender::fn {
/**
* A generic non-const pointer whose type is only known at runtime.
*/
class GMutablePointer {
private:
const CPPType *type_ = nullptr;
void *data_ = nullptr;
public:
GMutablePointer() = default;
GMutablePointer(const CPPType *type, void *data = nullptr) : type_(type), data_(data)
{
/* If there is data, there has to be a type. */
BLI_assert(data_ == nullptr || type_ != nullptr);
}
GMutablePointer(const CPPType &type, void *data = nullptr) : GMutablePointer(&type, data)
{
}
template<typename T> GMutablePointer(T *data) : GMutablePointer(&CPPType::get<T>(), data)
{
}
void *get() const
{
return data_;
}
const CPPType *type() const
{
return type_;
}
template<typename T> T *get() const
{
BLI_assert(this->is_type<T>());
return static_cast<T *>(data_);
}
template<typename T> bool is_type() const
{
return type_ != nullptr && type_->is<T>();
}
void destruct()
{
BLI_assert(data_ != nullptr);
type_->destruct(data_);
}
};
/**
* A generic const pointer whose type is only known at runtime.
*/
class GPointer {
private:
const CPPType *type_ = nullptr;
const void *data_ = nullptr;
public:
GPointer() = default;
GPointer(GMutablePointer ptr) : type_(ptr.type()), data_(ptr.get())
{
}
GPointer(const CPPType *type, const void *data = nullptr) : type_(type), data_(data)
{
/* If there is data, there has to be a type. */
BLI_assert(data_ == nullptr || type_ != nullptr);
}
GPointer(const CPPType &type, const void *data = nullptr) : type_(&type), data_(data)
{
}
template<typename T> GPointer(T *data) : GPointer(&CPPType::get<T>(), data)
{
}
const void *get() const
{
return data_;
}
const CPPType *type() const
{
return type_;
}
template<typename T> const T *get() const
{
BLI_assert(this->is_type<T>());
return static_cast<const T *>(data_);
}
template<typename T> bool is_type() const
{
return type_ != nullptr && type_->is<T>();
}
};
} // namespace blender::fn
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