Function: add method to create shallow copy of virtual array
Creating a shallow copy is sometimes useful to get a unique ptr for a virtual array when one only has a reference. It shouldn't be used usually, but sometimes its the fastest way to do correct ownership handling.
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@ -34,6 +34,12 @@ namespace blender::fn {
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template<typename T> class GVArray_Typed;
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template<typename T> class GVMutableArray_Typed;
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class GVArray;
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class GVMutableArray;
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using GVArrayPtr = std::unique_ptr<GVArray>;
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using GVMutableArrayPtr = std::unique_ptr<GVMutableArray>;
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/* A generically typed version of `VArray<T>`. */
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class GVArray {
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protected:
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@ -143,6 +149,8 @@ class GVArray {
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return GVArray_Typed<T>(*this);
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}
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GVArrayPtr shallow_copy() const;
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protected:
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virtual void get_impl(const int64_t index, void *r_value) const;
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virtual void get_to_uninitialized_impl(const int64_t index, void *r_value) const = 0;
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@ -215,9 +223,6 @@ class GVMutableArray : public GVArray {
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virtual void *try_get_internal_mutable_varray_impl();
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};
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using GVArrayPtr = std::unique_ptr<GVArray>;
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using GVMutableArrayPtr = std::unique_ptr<GVMutableArray>;
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class GVArray_For_GSpan : public GVArray {
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protected:
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const void *data_ = nullptr;
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@ -18,6 +18,37 @@
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namespace blender::fn {
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/* --------------------------------------------------------------------
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* GVArray_For_ShallowCopy.
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*/
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class GVArray_For_ShallowCopy : public GVArray {
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private:
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const GVArray &varray_;
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public:
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GVArray_For_ShallowCopy(const GVArray &varray)
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: GVArray(varray.type(), varray.size()), varray_(varray)
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{
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}
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private:
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void get_impl(const int64_t index, void *r_value) const override
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{
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varray_.get(index, r_value);
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}
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void get_to_uninitialized_impl(const int64_t index, void *r_value) const override
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{
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varray_.get_to_uninitialized(index, r_value);
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}
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void materialize_to_uninitialized_impl(const IndexMask mask, void *dst) const override
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{
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varray_.materialize_to_uninitialized(mask, dst);
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}
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};
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/* --------------------------------------------------------------------
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* GVArray.
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*/
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@ -73,6 +104,26 @@ const void *GVArray::try_get_internal_varray_impl() const
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return nullptr;
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}
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/**
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* Creates a new `std::unique_ptr<GVArray>` based on this `GVArray`.
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* The lifetime of the returned virtual array must not be longer than the lifetime of this virtual
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* array.
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*/
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GVArrayPtr GVArray::shallow_copy() const
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{
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if (this->is_span()) {
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return std::make_unique<GVArray_For_GSpan>(this->get_internal_span());
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}
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if (this->is_single()) {
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BUFFER_FOR_CPP_TYPE_VALUE(*type_, buffer);
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this->get_internal_single(buffer);
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std::unique_ptr new_varray = std::make_unique<GVArray_For_SingleValue>(*type_, size_, buffer);
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type_->destruct(buffer);
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return new_varray;
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}
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return std::make_unique<GVArray_For_ShallowCopy>(*this);
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}
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/* --------------------------------------------------------------------
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* GVMutableArray.
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*/
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