diff options
author | Jacques Lucke <jacques@blender.org> | 2020-12-02 14:59:42 +0300 |
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committer | Jacques Lucke <jacques@blender.org> | 2020-12-02 17:38:47 +0300 |
commit | 1d6284a6d5c4e2d508aeee2f1a20542db319b335 (patch) | |
tree | 2af16bfe3dc3e358e9b2eb69a51fb515fe080a36 | |
parent | c7f518fe35acdf51ab53c1de198db833289be80e (diff) |
Functions: add generic pointer class
This class represents a pointer whose type is only known at runtime.
-rw-r--r-- | source/blender/functions/CMakeLists.txt | 1 | ||||
-rw-r--r-- | source/blender/functions/FN_generic_pointer.hh | 76 |
2 files changed, 77 insertions, 0 deletions
diff --git a/source/blender/functions/CMakeLists.txt b/source/blender/functions/CMakeLists.txt index 9a6b6f4a4db..e005753e228 100644 --- a/source/blender/functions/CMakeLists.txt +++ b/source/blender/functions/CMakeLists.txt @@ -38,6 +38,7 @@ set(SRC FN_array_spans.hh FN_attributes_ref.hh FN_cpp_type.hh + FN_generic_pointer.hh FN_generic_vector_array.hh FN_multi_function.hh FN_multi_function_builder.hh diff --git a/source/blender/functions/FN_generic_pointer.hh b/source/blender/functions/FN_generic_pointer.hh new file mode 100644 index 00000000000..5c2b611c614 --- /dev/null +++ b/source/blender/functions/FN_generic_pointer.hh @@ -0,0 +1,76 @@ +/* + * 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 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 reinterpret_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_); + } +}; + +} // namespace blender::fn |