Jacques Lucke
79d6bd9a22
This adds a GPointer class, which is mostly the same as GMutablePointer. The main difference is that GPointer references const data, while GMutablePointer references non-const data.
128 lines
2.8 KiB
C++
128 lines
2.8 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "FN_cpp_type.hh"
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namespace blender::fn {
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/**
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* A generic non-const pointer whose type is only known at runtime.
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*/
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class GMutablePointer {
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private:
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const CPPType *type_ = nullptr;
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void *data_ = nullptr;
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public:
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GMutablePointer() = default;
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GMutablePointer(const CPPType *type, void *data = nullptr) : type_(type), data_(data)
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{
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/* If there is data, there has to be a type. */
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BLI_assert(data_ == nullptr || type_ != nullptr);
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}
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GMutablePointer(const CPPType &type, void *data = nullptr) : GMutablePointer(&type, data)
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{
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}
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template<typename T> GMutablePointer(T *data) : GMutablePointer(&CPPType::get<T>(), data)
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{
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}
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void *get() const
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{
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return data_;
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}
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const CPPType *type() const
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{
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return type_;
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}
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template<typename T> T *get() const
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{
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BLI_assert(this->is_type<T>());
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return static_cast<T *>(data_);
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}
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template<typename T> bool is_type() const
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{
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return type_ != nullptr && type_->is<T>();
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}
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void destruct()
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{
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BLI_assert(data_ != nullptr);
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type_->destruct(data_);
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}
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};
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/**
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* A generic const pointer whose type is only known at runtime.
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*/
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class GPointer {
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private:
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const CPPType *type_ = nullptr;
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const void *data_ = nullptr;
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public:
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GPointer() = default;
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GPointer(GMutablePointer ptr) : type_(ptr.type()), data_(ptr.get())
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{
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}
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GPointer(const CPPType *type, const void *data = nullptr) : type_(type), data_(data)
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{
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/* If there is data, there has to be a type. */
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BLI_assert(data_ == nullptr || type_ != nullptr);
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}
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GPointer(const CPPType &type, const void *data = nullptr) : type_(&type), data_(data)
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{
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}
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template<typename T> GPointer(T *data) : GPointer(&CPPType::get<T>(), data)
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{
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}
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const void *get() const
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{
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return data_;
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}
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const CPPType *type() const
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{
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return type_;
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}
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template<typename T> const T *get() const
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{
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BLI_assert(this->is_type<T>());
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return static_cast<const T *>(data_);
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}
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template<typename T> bool is_type() const
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{
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return type_ != nullptr && type_->is<T>();
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}
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};
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} // namespace blender::fn
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